DQRs for Session: 144981 User:hs32Completed: 09-27-2012

Data Quality Reports for Session: 144981 User: hs32 Completed: 09/27/2012

TABLE OF CONTENTS

DQR ID	Subject	Data Streams Affected
D030712.25	SGP/VCEIL/B1 - recurrent frequent data gaps	sgpvceil25kB1.00, sgpvceil25kB1.a1, sgpvceil25kB1.b1
D040506.1	TWP/VCEIL/C3 - Data collection problem	twpvceil25kC3.00, twpvceil25kC3.b1
D041013.2	TWP/VCEIL/C1 - Data dropouts	twpvceil25kC1.b1, twpvceil25kC1.00
D050112.1	NSA/C1 - Site-wide power failure	nsaaerich1C1.b1, nsaaerich2C1.b1, nsaaeriengineerC1.b1, nsaaerisummaryC1.b1, nsa915rwptempconC1.a1, nsa915rwptempmomC1.a0, nsa915rwptempspecC1.a0, nsa915rwpwindconC1.a1, nsa915rwpwindmomC1.a0, nsa915rwpwindspecC1.a0, nsamettwr4hC1.b1, nsammcrmomC1.b1, nsamplC1.a1, nsamplpsC1.a0, nsamwrlosC1.b1, nsamwrtipC1.a1, nsamwrpC1.b1, nsatwrcam40mC1.a1, nsavceil25kC1.b1
D050131.21	SGP/VCEIL/B1 - Ice storm	sgpvceil25kB1.b1
D050310.1	TWP/VCEIL/C2 - Ceilometer failure	twpvceil25kC2.00, twpvceil25kC2.b1
D050406.2	SGP/VCEIL/B5 - Noisy Backscatter	sgpvceil25kB5.b1
D050614.1	SGP/VCEIL/C1 - poor signal	sgpvceil25kC1.b1
D050624.6	NSA/VCEIL/C1 - Reprocess: Intermittent data and clock drift	nsavceil25kC1.b1
D050721.2	SGP/VCEIL/B4 - Detection optics degrading	sgpvceil25kB4.b1
D051005.3	SGP/VCEIL/B5 - Backscatter noise affects cloud detection	sgpvceil25kB5.b1
D051209.4	TWP/VCEIL/C3 - Degraded hardware	twpvceil25kC3.b1
D051209.5	TWP/VCEIL/C2 - occasional communication fault	twpvceil25kC2.b1
D051216.6	TWP/VCEIL/C3 - ceilometer lost sensitivity	twpvceil25kC3.b1
D051219.1	NSA/VCEIL/C1 - poor sensitivity at low altitude	nsavceil25kC1.b1
D060113.1	TWP/VCEIL/C3 - low receiver sensitivity	twpvceil25kC3.b1
D060517.3	TWP/VCEIL/C2 - Vceil computer disconnected	twpvceil25kC2.b1
D060707.5	SGP/VCEIL/C1 - low amplitude	sgpvceil25kC1.b1
D060717.5	TWP/VCEIL/C2 - Time offset	twpvceil25kC2.b1
D061220.34	TWP/VCEIL/C3 - standard instrument installed	twpvceil25kC3.b1
D070201.1	TWP/VCEIL/C3 - Reduced sensitivity to high clouds	twpvceil25kC3.b1
D070201.2	TWP/VCEIL/C2 - optical cross-talk compensation	twpvceil25kC2.b1
D070219.1	SGP/VCEIL/B6 - contaminated window	sgpvceil25kB6.b1
D070329.1	TWP/VCEIL/C2 - Receiver failure	twpvceil25kC2.b1
D070503.3	TWP/VCEIL/C3 - Reduced sensitivity to high clouds	twpvceil25kC3.b1
D070522.1	SGP/VCEIL/B6 - contaminated window	sgpvceil25kB6.b1
D071101.2	SGP/VCEIL/B5 - Degraded hardware	sgpvceil25kB5.b1
D080924.4	SGP/VCEIL/B5 - Missing data	sgpvceil25kB5.b1
D090108.1	SGP/VCEIL/B4 - Window contamination	sgpvceil25kB4.b1
D090507.2	GRW/VCEIL/M1 - Receiver failure	grwvceil25kM1.b1
D090527.1	TWP/VCEIL/C1 - Compensation fiber	twpvceil25kC1.b1
D091026.1	SGP/VCEIL/B1 - Warning flag	sgpvceil25kB1.b1
D091210.1	NSA/VCEIL/C1 - Degraded window	nsavceil25kC1.b1
D100125.2	NSA/VCEIL/C1 - Missing data	nsavceil25kC1.b1
D100215.1	SGP/VCEIL/C1/B4/B5/B6 - Reprocess: Incorrect serial_number and sum_backscatter fields	sgpvceil25kB4.b1, sgpvceil25kB5.b1, sgpvceil25kB6.b1, sgpvceil25kC1.b1
D100215.2	SGP/VCEIL/B1 - Reprocess: Incorrect serial_number and sum_backscatter fields	sgpvceil25kB1.b1
D100215.3	NSA/VCEIL/C1/C2 - Reprocess: Incorrect serial_number and sum_backscatter fields	nsavceil25kC1.b1, nsavceil25kC2.b1
D100215.4	TWP/VCEIL/C1 - Reprocess: Incorrect serial_number and sum_backscatter fields	twpvceil25kC1.b1
D100215.5	TWP/VCEIL/C2 - Reprocess: Incorrect serial_number and sum_backscatter fields	twpvceil25kC2.b1
D100215.6	TWP/VCEIL/C3 - Reprocess: Incorrect serial_number and sum_backscatter fields	twpvceil25kC3.b1
D100216.2	PYE/VCEIL/M1 - Reprocess: Incorrect serial_number and sum_backscatter fields	pyevceil25kM1.b1
D100216.3	NIM/VCEIL/M1 - Reprocess: Incorrect serial_number and sum_backscatter fields	nimvceil25kM1.b1
D100216.4	FKB/VCEIL/M1 - Reprocess: Incorrect serial_number and sum_backscatter fields	fkbvceil25kM1.b1
D100216.5	HFE/VCEIL/M1 - Reprocess: Incorrect serial_number and sum_backscatter fields	hfevceil25kM1.b1
D100216.6	GRW/VCEIL/M1 - Reprocess: Incorrect serial_number and sum_backscatter fields	grwvceil25kM1.b1
D100225.2	HFE/VCEIL/S1 - Incorrect serial_number and sum_backscatter fields	hfevceil25kS1.b1
D100514.1	SGP/VCEIL/C1 - Range normalization	sgpvceil25kC1.b1
D100616.2	NSA/VCEIL/C1 - Small gaps in data	nsavceil25kC1.b1
D100719.1	NSA/VCEIL/C1 - Gaps in data	nsavceil25kC1.b1
D110318.2	TWP/VCEIL/C1 - Missing data	twpvceil25kC1.b1
D120524.7	SGP/VCEIL/C1 - Contaminated window	sgpvceil25kC1.b1

DQRID : D030712.25

Start Date	Start Time	End Date	End Time
07/06/2003	0828	07/15/2003	1949

Subject:	SGP/VCEIL/B1 - recurrent frequent data gaps
DataStreams:	sgpvceil25kB1.00, sgpvceil25kB1.a1, sgpvceil25kB1.b1
Description:	Beginning on 07/06/2003, frequent short-term data gaps began occurring. The situation continued to worsen until the PC locked up entirely on 07/14/2003. After the computer was re-booted, the data gaps stopped and have not returned. The problem appears to be restricted entirely to the computer and does not involve the ceilometer itself. Thus, there appears to be no problem with the data records that were properly collected.
Measurements:	sgpvceil25kB1.b1: laser_temperature tilt_angle status_flag window_contamination detection_status laser_pulse_energy lat receiver_sensitivity measurement_parameters vertical_visibility Third cloud base height(third_cbh) range status_string Second lowest cloud base height(second_cbh) lon alt_highest_signal Lowest cloud base height detected.(first_cbh) background_light Backscatter(backscatter) sum_backscatter base_time alt time_offset sgpvceil25kB1.00: Raw data stream - documentation not supported sgpvceil25kB1.a1: receiver_sensitivity measurement_parameters lon detection_status altitude_tags sum_backscatter lat vertical_visibility tilt_angle laser_temperature base_time range Second lowest cloud base height(second_cbh) parameter_scale Third cloud base height(third_cbh) alt_highest_signal Backscatter(backscatter) window_contamination Lowest cloud base height detected.(first_cbh) status_flag time_offset alt status_string laser_pulse_energy background_light lowest_cloud_base_ht filename

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DQRID : D040506.1

Start Date	Start Time	End Date	End Time
04/01/2004	0000	05/07/2004	0000

Subject:	TWP/VCEIL/C3 - Data collection problem
DataStreams:	twpvceil25kC3.00, twpvceil25kC3.b1
Description:	There was a bad connection between the ceilometer and the instrument computer which resulted in a small amount of data loss on 8 days during the effected period. The data that were collected are not effected by the problem. On April 11, 34% of the data was lost and on April 1, 4% was lost. On the remaining 6 days, May 1-6, the amount of data lost was less than 2%/day.
Measurements:	twpvceil25kC3.00: Raw data stream - documentation not supported twpvceil25kC3.b1: receiver_sensitivity status_string laser_pulse_energy status_flag Second lowest cloud base height(second_cbh) measurement_parameters Lowest cloud base height detected.(first_cbh) lon alt_highest_signal vertical_visibility alt Backscatter(backscatter) laser_temperature tilt_angle sum_backscatter lat Third cloud base height(third_cbh) range time_offset window_contamination background_light detection_status base_time

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DQRID : D041013.2

Start Date	Start Time	End Date	End Time
09/29/2004	0100	11/15/2004	1520

Subject:	TWP/VCEIL/C1 - Data dropouts
DataStreams:	twpvceil25kC1.b1, twpvceil25kC1.00
Description:	The Manus ceilometer was not receiving complete data packs from the ceilometer. This occurred at irregular intervals up to 3-10 times per hour until an error occurred and the computer locked up. The data were not affected when they were successfully collected. Days on which the data are missing for more than 1 hour are listed below. Some maintenance was done on the ceilometer data computer in November and the computer was ultimately replace on 3 January 2005. year.month.day 2004.09.29 2004.10.03 2004.10.04 2004.10.07 2004.10.10 2004.10.11 2004.10.12 2004.10.13 2004.10.14 2004.10.17 2004.10.18 2004.10.22 2004.10.25 2004.10.26 2004.10.27 2004.10.28 2004.10.29 2004.10.30 2004.11.15
Measurements:	twpvceil25kC1.b1: sum_backscatter Lowest cloud base height detected.(first_cbh) lon status_flag window_contamination laser_pulse_energy alt Second lowest cloud base height(second_cbh) alt_highest_signal time_offset detection_status tilt_angle receiver_sensitivity filename vertical_visibility measurement_parameters range laser_temperature lat status_string Third cloud base height(third_cbh) base_time background_light Backscatter(backscatter) twpvceil25kC1.00: Raw data stream - documentation not supported

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DQRID : D050112.1

Start Date	Start Time	End Date	End Time
12/13/2004	1000	12/13/2004	2330

Subject:	NSA/C1 - Site-wide power failure
DataStreams:	nsaaerich1C1.b1, nsaaerich2C1.b1, nsaaeriengineerC1.b1, nsaaerisummaryC1.b1, nsa915rwptempconC1.a1, nsa915rwptempmomC1.a0, nsa915rwptempspecC1.a0, nsa915rwpwindconC1.a1, nsa915rwpwindmomC1.a0, nsa915rwpwindspecC1.a0, nsamettwr4hC1.b1, nsammcrmomC1.b1, nsamplC1.a1, nsamplpsC1.a0, nsamwrlosC1.b1, nsamwrtipC1.a1, nsamwrpC1.b1, nsatwrcam40mC1.a1, nsavceil25kC1.b1
Description:	The Barrow facility experienced a site-wide power failure on 12/13. Power was restored to most instruments between 2250 and 2330 GMT.
Measurements:	nsa915rwpwindspecC1.a0: Backscatter, doppler spectrum, 915 MHz RWP(spc_amp) alt plen ncoh tditime bswitch time_offset nspc sitime vband bins elevation dly lon nheight sampr base_time height_t range_gate prf rgs oband pcbits vsr spcavetim ipp beam lat rgl rgf nsa915rwpwindconC1.a1: Eastward Wind Component(u_wind) lon nspc power avgint rgs snr3 snr4 snr0 snr1 snr2 dly vvsr Wind direction, horizontal, at altitude, 915 MHz RWP(dir) oband tditime rgl rgf range_gate ncoh time_offset lat prf base_time ovsr azimuth1 azimuth0 azimuth3 azimuth2 Beam 2 radial wind speed(vel2) Beam 1 radial wind speed(vel1) azimuth4 Beam 4 radial wind speed(vel4) Beam 3 radial wind speed(vel3) sampr Beam 0 radial wind speed(vel0) ipp nrcns4 nrcns3 nrcns2 nrcns1 nrcns0 ncns1 ncns0 ncns3 ncns2 ncns4 sitime Wind speed, horizontal, at altitude, 915 MHz RWP(spd) plen spcavetim alt nheight nrec0 nrec1 nrec2 nrec3 nrec4 elevation0 Northward Wind Component(v_wind) elevation2 elevation1 elevation4 elevation3 height_p vband pcbits bswitch nsaaerich2C1.b1: Radiation, longwave, downwelling radiance, 0.5 cm-1 resolution, 3.3-5.5 um(mean_rad) AERIunitNumber calibratedSceneID timeHHMMSS wnum2 Time_UTC_hours systemReleaseNumber channelNumber time_offset base_time alt Longitude BBsupportStructureTemp atmosphericRelativeHumidity missingDataFlag calibrationCBBtemp instrumentUnitNumber Latitude sceneMirrorAngle dateYYMMDD calibrationAmbientTemp atmosphericPressure wnum outsideAirTemp calibrationHBBtemp lat hatchOpen JulianDay sceneViewDuration standard_dev_mean_rad time lon sceneMirPosEncoderMaxDrift Altitude nsamwrlosC1.b1: IR Brightness Temperature(sky_ir_temp) wet_window 31.4 GHz sky brightness temperature(tbsky31) Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23) tkbb alt tnd_nom31 tnd_nom23 bb23 bb31 time_offset tc23 tc31 tknd lat actel tnd23 tnd31 tkxc Temperature, brightness, longwave(ir_temp) sky23 bbn23 base_time sky31 bbn31 actaz tkair lon Total liquid water along LOS path(liq) Total water vapor along LOS path(vap) nsaaerisummaryC1.b1: sceneMirPosEncoderMaxDrift skyViewStdDevRadiance675_680 Radiation, longwave, brightness temp, surface air, mean, 675-680 cm-1(surfaceLayerAirTemp675_680) JulianDay SWskyNENacceptable channelNumber calibrationAmbientTemp LW_HBB_NEN Radiation, longwave, radiance, elevated air, mean, 2282-2287 cm-1(elevatedLayerRadiance2282_2287) LWskyNEN Latitude lon systemReleaseNumber skyViewStdDevRadiance985_990 AERI LW Scene Radiance Spectral Averages (Ch1)(SkyRadianceSpectralAveragesCh1) AERI SW Scene Radiance Spectral Averages (Ch2)(SkyRadianceSpectralAveragesCh2) outsideAirTemp wnumsum7 wnumsum6 wnumsum5 wnumsum4 wnumsum3 wnumsum2 wnumsum1 wnumsum9 wnumsum8 HBB2minNENestimateNo1Ch1 HBB2minNENestimateNo1Ch2 HBBstable Radiation, longwave, radiance, atmospheric window, mean, 985-990 cm-1(longwaveWindowRadiance985_990) LWresponsivity maxSampleStdDev lat Altitude dataAvailable instrumentUnitNumber time_offset calibrationHBBtemp atmosphericPressure LWskyNENacceptable Radiation, longwave, radiances, SD, 25 cm-1 spectral avgs, 5.5-18 um(SkyUniformityCh1) Radiation, longwave, radiances, SD, 25 cm-1 spectral avgs, 3.3-5.5 um(SkyUniformityCh2) time calibratedSceneID atmosphericRelativeHumidity sceneViewDuration sceneMirPosEncoderDrift Radiation, longwave, brightness temp, 25 cm-1 spectral avgs, 3.3-5.5 um(SkyBrightnessTempSpectralAveragesCh2) Radiation, longwave, brightness temp, 25 cm-1 spectral avgs, 5.5-18 um(SkyBrightnessTempSpectralAveragesCh1) ResponsivitySpectralAveragesCh1 ResponsivitySpectralAveragesCh2 SkyNENCh1 SkyNENCh2 hatchOpen Radiation, longwave, brightness temp, elevated air, mean, 2282-2287 cm-1(elevatedLayerAirTemp2282_2287) SW_HBB_NEN sceneMirrorAngle Radiation, longwave, radiance, atmospheric window, mean, 2510-2515 cm-1(shortwaveWindowRadiance2510_2515) Radiation, longwave, brightness temp, elevated air, mean, 700-705 cm-1(elevatedLayerAirTemp700_705) Radiation, longwave, brightness temp, atmospheric window, mean, 2510-2515 cm-1(shortwaveWindowAirTemp2510_2515) HBB2minNENestimateNo2Ch2 HBB2minNENestimateNo2Ch1 skyViewStdDevRadiance2510_2515 dateYYMMDD alt Radiation, longwave, radiance, surface air, mean, 2295-2300 cm-1(surfaceLayerRadiance2295_2300) base_time skyViewStdDevRadiance2282_2287 Radiation, longwave, brightness temp, surface air, mean, 2295-2300 cm-1(surfaceLayerAirTemp2295_2300) SWskyNEN wnumsum11 wnumsum12 wnumsum13 wnumsum14 wnumsum10 skyViewStdDevRadiance700_705 SWresponsivity Longitude HBBtempDrift sunSensorIntensity Radiation, longwave, radiance, surface air, mean, 675-680 cm-1(surfaceLayerRadiance675_680) missingDataFlag ABBmaxTempDiff Radiation, longwave, radiance, elevated air, mean, 700-705 cm-1(elevatedLayerRadiance700_705) HBBmaxTempDiff timeHHMMSS AERIunitNumber skyViewStdDevRadiance2295_2300 frontEndFanAirTempDiff calibrationCBBtemp Time_UTC_hours rainSensorIntensity Radiation, longwave, brightness temp, atmospheric window, mean, 985-990 cm-1(longwaveWindowAirTemp985_990) nsa915rwptempmomC1.a0: base_time rgs noise Signal to noise ratio(snr) Pressure, associated geometric height, at altitude, NGM model output(height) Temperature, virtual, profile, merged from 50 and 915 MHz RASS(virtual_temp) Mean radial beam velocity(mdf) smdf lon time_offset sampr Spectral width(specw) alt ssnr sspecw lat nsaaerich1C1.b1: lon Time_UTC_hours atmosphericPressure JulianDay sceneMirrorAngle hatchOpen outsideAirTemp Longitude dateYYMMDD time sceneViewDuration Radiation, longwave, downwelling radiance, 0.5 cm-1 resolution, 3.3-5.5 um(mean_rad) sceneMirPosEncoderMaxDrift timeHHMMSS base_time calibrationCBBtemp Latitude calibrationHBBtemp missingDataFlag instrumentUnitNumber atmosphericRelativeHumidity systemReleaseNumber channelNumber wnum2 lat BBsupportStructureTemp standard_dev_mean_rad Altitude wnum calibratedSceneID AERIunitNumber alt time_offset calibrationAmbientTemp nsamplpsC1.a0: range_bin_time background_signal time shots_summed lat voltage_15 max_altitude voltage_05 voltage_10 pulse_rep instrument_temp detector_temp Pressure, associated geometric height, at altitude, NGM model output(height) laser_temp time_offset range_offset range filter_temp Preliminary cloud base height above ground level(preliminary_cbh) energy_monitor alt range_bins detector_counts base_time lon range_bin_width nsavceil25kC1.b1: status_string Backscatter(backscatter) Lowest cloud base height detected.(first_cbh) tilt_angle base_time Second lowest cloud base height(second_cbh) detection_status alt_highest_signal window_contamination receiver_sensitivity vertical_visibility laser_temperature alt time_offset filename lat laser_pulse_energy sum_backscatter status_flag lon background_light Third cloud base height(third_cbh) measurement_parameters range nsa915rwptempspecC1.a0: Pressure, associated geometric height, at altitude, NGM model output(height) sampr rgs lat lon base_time time_offset alt Backscatter, doppler spectrum, 915 MHz RWP(spc_amp) bins nsa915rwptempconC1.a1: SNR Corrected Beam 0 Virtual Temperature(snr_virtual_temp_corr) ncns_virtual_temp SNR Beam 0 Virtual Temperature(snr_virtual_temp) Pressure, associated geometric height, at altitude, NGM model output(height) rgs ncns_vert_v ncns_virtual_temp_corr time_offset Temperature, virtual, profile, merged from 50 and 915 MHz RASS(virtual_temp) Wind speed, vertical velocity, at altitude, 915 MHz RWP(vert_v) lat nrcns base_time SNR Vertical wind velocity(snr_vert_v) sampr lon Temperature, virtual, at altitude, 10-min cons. avg, corrected, 915 MHz RWP/RASS(virtual_temp_corr) avgint alt nrec nsaaeriengineerC1.b1: BBcontroller2temp skyViewImaginaryRadiance2295_2300 HBBmaxTempDiff ABBtempOffset skyViewImaginaryRadiance2510_2515 detectorTemp coadditionsCount calibrationHBBtemp Radiation, longwave, radiance, surface air, mean, 675-680 cm-1(surfaceLayerRadiance675_680) skyViewStdDevRadiance985_990 HBBapexTemp ABBviewStdDevRadiance2295_2300 systemReleaseNumber skyViewStdDevRadiance2510_2515 ABBviewStdDevRadiance985_990 base_time timeHHMMSS sceneMirrorAngle LW_HBB_NEN spareTemp HBBstable Latitude sceneMirPosEncoderMaxDrift Radiation, longwave, brightness temp, elevated air, mean, 2282-2287 cm-1(elevatedLayerAirTemp2282_2287) channelNumber HBBviewStdDevRadiance700_705 outsideAirTemp HBBviewStdDevRadiance2510_2515 rackAmbientTemp calibratedSceneID frontEndFanAirHeatedTemp HBBtempOffset instrumentUnitNumber ABBtopTemp skyViewImaginaryRadiance700_705 fixed2500ohmResistor missingDataFlag time_offset fixed97KohmResistor LWskyNEN HBBapexTempWeight ABBbottomTempWeight expandedInterferogramSize Radiation, longwave, brightness temp, atmospheric window, mean, 2510-2515 cm-1(shortwaveWindowAirTemp2510_2515) coolerCurrent ABBviewStdDevRadiance700_705 HBBbottomTemp frontEndFanAirUnheatedTemp computerTemp LWresponsivity lon calibrationAmbientTemp interferometerSecondPortTemp skyViewStdDevRadiance700_705 Radiation, longwave, brightness temp, elevated air, mean, 700-705 cm-1(elevatedLayerAirTemp700_705) interferometerEnclosureRelativeHumidity originalInterferogramSize HBBviewStdDevRadiance985_990 maxSampleStdDev Radiation, longwave, radiance, atmospheric window, mean, 2510-2515 cm-1(shortwaveWindowRadiance2510_2515) motorDriverTemp SWskyNENlimit Longitude alt HBBviewStdDevRadiance675_680 HBBviewStdDevRadiance2282_2287 ABBapexTemp hatchOpen skyViewImaginaryRadiance2282_2287 ABBbottomTemp AERIunitNumber Altitude LWskyNENacceptable sceneMirPosCount sceneMirrorMotorStep SWresponsivity lat originalLaserWavenumber Radiation, longwave, brightness temp, surface air, mean, 2295-2300 cm-1(surfaceLayerAirTemp2295_2300) Radiation, longwave, radiance, atmospheric window, mean, 985-990 cm-1(longwaveWindowRadiance985_990) ABBviewStdDevRadiance675_680 BBsupportStructureTemp HBBviewStdDevRadiance2295_2300 sceneMirPosEncoder rainSensorIntensity twoMinuteNoiseEstimateFactor skyViewImaginaryRadiance985_990 SCEtemp sceneViewDuration ABBviewStdDevRadiance2282_2287 skyViewImaginaryRadiance675_680 BBcontroller1temp HBBtopTempWeight dateYYMMDD airNearBBsTemp ABBmaxTempDiff HBBtempDriftLimit Radiation, longwave, radiance, surface air, mean, 2295-2300 cm-1(surfaceLayerRadiance2295_2300) BBcavityFactor coolerCompressorTemp sceneMirrorTemp coolerExpanderTemp coolerPowerSupplyTemp dataAvailable skyViewStdDevRadiance675_680 Time_UTC_hours Radiation, longwave, brightness temp, atmospheric window, mean, 985-990 cm-1(longwaveWindowAirTemp985_990) HBBtempDrift sunSensorIntensity atmosphericRelativeHumidity sceneMirrorPosition ABBviewStdDevRadiance2510_2515 atmosphericPressure HBBtopTemp skyViewStdDevRadiance2282_2287 SWskyNENacceptable time JulianDay ABBapexTempWeight Radiation, longwave, brightness temp, surface air, mean, 675-680 cm-1(surfaceLayerAirTemp675_680) SW_HBB_NEN ABBtopTempWeight LWskyNENlimit fixed12KohmResistor SWskyNEN airNearInterferometerTemp Radiation, longwave, radiance, elevated air, mean, 700-705 cm-1(elevatedLayerRadiance700_705) mirrorMotorTemp Radiation, longwave, radiance, elevated air, mean, 2282-2287 cm-1(elevatedLayerRadiance2282_2287) FFOVhalfAngle interferometerWindowTemp sceneMirPosEncoderDrift skyViewStdDevRadiance2295_2300 HBBbottomTempWeight calibrationCBBtemp outputLaserWavenumber opticsCompartmentRelativeHumidity numberOfTerms frontEndFanAirTempDiff nsamplC1.a1: range_bin_time detector_temp total_counts scalar_sync_offset Pressure, associated geometric height, at altitude, NGM model output(height) transceiver_azimuth_angle time_offset laser_sync_offset Preliminary cloud base height above ground level(preliminary_cbh) voltage_10 voltage_15 voltage_05 trigger_freq time instrument_temp shots_sum filter_temp Backscatter(backscatter) alt lon base_time pulse_rep background_signal deadtime_correction laser_scalar_sync_offset lat range max_altitude range_bin_width energy_monitor range_offset shots_summed property laser_temp transceiver_altitude_angle range_bins nsammcrmomC1.b1: ReceiverNumber CalCheckTime RxCalTimeStamp TWTStatusCode DCFilterONOFF base_time NumCodeBits MMCR Mean Doppler Velocity(MeanDopplerVelocity) WindowingONOFF NumFFT ReceiverMode GateSpacing heights NumHeights CalCheckLevel PulseWidth NumSpectralAverages SkyNoiseLevel Power DataQualityStatus SignalToNoiseRatio ClutterHeight ModeNum NumCoherentIntegrations MinimumDetectableReflectivity time_offset Cloud, reflectivity, at altitude(Reflectivity) Rx290KLevel lon NyquistVelocity ModeDescription PeakTransmittedPowerAvg TimeAvg StartGateDelay InterPulsePeriod lat alt RxGain time NumReceivers RangeCorrectedPower MMCR Spectral Width(SpectralWidth) AvgNoiseLevel NoiseLevel CircularDepolarizationRatio RadarConstant nsamettwr4hC1.b1: lat SonicWD_SDU_WVT RH10M_STD VP10M_STD Relative humidity, average, at 10-m height(RH10M_AVG) Wind speed, vector-averaged, at 10-m height(WS10M_U_WVT) Temperature, dew point, average, at 2-m height(DP2M_AVG) Pressure, vapor, at 2-m height(VP2M_AVG) Pressure, vapor, at 20-m height(VP20M_AVG) Temperature, dew point, average, at 10-m height(DP10M_AVG) CMHTemp VP20M_STD DP20M_STD Wind speed, mean, at 2-m height(WS2M_S_WVT) Wind speed, vector-averaged, at 2-m height(WS2M_U_WVT) RefT10m_AVG DP40M_STD Wind direction, vector-averaged, at 40-m height(WD40M_DU_WVT) Wind speed, mean, at 40-m height(WS40M_S_WVT) time RefT40M_AVG DP10M_STD PWSAlarm WD40M_SDU_WVT alt RefT2M_AVG Wind speed, vector-averaged, at 20-m height(WS20M_U_WVT) SatVPCMH PwCod1hr lon Temperature, air, average, at 10-m height(T10M_AVG) Temperature, dew point, average, at 20-m height(DP20M_AVG) SonicS_AVG T40M_STD VPCMH DP2M_STD RH40M_STD RefT20M_AVG VP40M_STD PcpRate base_time Pressure, atmospheric(AtmPress) SonicX_AVG Visibility, 1 minute average(AvgVis1mi) WD2M_SDU_WVT Wind direction, vector-averaged, at 20-m height(WD20M_DU_WVT) Visibility, 10 minute average(AvgVis10m) CMHDP Temperature, air, average, at 20-m height(T20M_AVG) T10M_STD CumH2O CumSnow PwCod15mi T20M_STD Volt10M_AVG SonicY_AVG Relative humidity, average, at 40-m height(RH40M_AVG) WD10M_SDU_WVT WD20M_SDU_WVT Wind direction vector mean(SonicWD_DU_WVT) Temperature, air, average, at 40-m height(T40M_AVG) Wind speed, mean, at 10-m height(WS10M_S_WVT) Pressure, vapor, at 10-m height(VP10M_AVG) InstPwCod Volt40M_AVG Wind direction, vector-averaged, at 10-m height(WD10M_DU_WVT) RH2M_STD Batt_Volt Relative humidity, average, at 2-m height(RH2M_AVG) Wind speed, vector-averaged, at 40-m height(WS40M_U_WVT) T2M_STD Temperature, air, average, at 2-m height(T2M_AVG) Temperature, dew point, average, at 40-m height(DP40M_AVG) VP2M_STD time_offset Wind speed vector mean(SonicWS_U_WVT) RH20M_STD Pressure, vapor, at 40-m height(VP40M_AVG) Relative humidity, average, at 20-m height(RH20M_AVG) Wind speed, mean, at 20-m height(WS20M_S_WVT) Wind direction, vector-averaged, at 2-m height(WD2M_DU_WVT) Volt20M_AVG Volt2M_AVG Wind speed arithmetic mean(SonicWS_S_WVT) CMHRH nsamwrpC1.b1: azimuth Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity) alt frequency Temperature, air, at instrument height (1 or 2 m)(surfaceTemperature) elevation Liquid water content, cloud, vert. prof. sfc.-10km, from Tbright stat. retrvl.(liquidWaterContent) Humidity, relative, at instrument height (1 or 2 m)(surfaceRelativeHumidity) Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2) Pressure, lifting condensation level(liftingCondensationLevelPres) Liquid water path, from Tbright at 23.835 and 30.0 GHz only, using stat. retrvl.(liquidWaterPath2) Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater) base_time totalPrecipitableWaterRmsError Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature) Density, water vapor, at instrument height (1 or 2 m)(surfaceWaterVaporDensity) liquidWaterContentRmsError blackbodyTemperature Height, level of free convection(levelFreeConvection) Retrieved dewpoint temperature(dewpointTemperature) lon time temperatureRmsError Retrieved water vapor mixing ratio(waterVaporMixingRatio) Air temperature(temperature) time_offset Microwave brightness temperature(brightnessTemperature) Height, lifting condensation level(liftingCondensationLevel) Height, cloud base, height where IR temp. matches retrieved temp. profile(cloudBaseHeight) Humidity, relative, prof. from sfc.-10km, from water vap. dens. and temp. prof.(relativeHumidity) Height, equilibrium level(equilibriumLevel) Barometric pressure(pressure) Pressure, barometric. at instrument height (1 or 2 m)(surfacePressure) Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath) Pressure, associated geometric height, at altitude, NGM model output(height) lat liquidWaterPathRmsError Pressure, equilibrium level(equilibriumLevelPres) totalPrecipitableWater2RmsError waterVaporDensityRmsError infraredTemperature dataQualityFlags Pressure, level of free convection(levelFreeConvectionPres) Energy, potential, convective, available, from RUC model(cape) liquidWaterPath2RmsError wetWindowFlag nsa915rwpwindmomC1.a0: Signal to noise ratio(snr) oband bswitch lon beam base_time vband spcavetime pcbits ipp Mean radial beam velocity(mdf) plen nheight alt dly time_offset vsr elevation nspc Spectral width(specw) sitime ncoh tditime range_gate prf noise height_t lat sampr rgl rgs rgf nsamwrtipC1.a1: tbskytip31 tnd23I tbskytip23 r31 lon r23 lat tnd23 tnd31 wet_window tknd tkxc alt tkbb bb23 time_offset bb31 tc31 base_time tnd31I tc23 tnd_nom23 tnd_nom31 actaz liqtip actel tipsky31 tipsky23 tkair vaptip bbn31 bbn23 nsatwrcam40mC1.a1: JPEG data stream - documentation not yet available

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DQRID : D050131.21

Start Date	Start Time	End Date	End Time
01/04/2005	0900	01/11/2005	2123

Subject:	SGP/VCEIL/B1 - Ice storm
DataStreams:	sgpvceil25kB1.b1
Description:	Data missing due to severe ice storm.
Measurements:	sgpvceil25kB1.b1: status_string Second lowest cloud base height(second_cbh) receiver_sensitivity laser_temperature lat lon tilt_angle base_time alt_highest_signal alt measurement_parameters status_flag Lowest cloud base height detected.(first_cbh) background_light window_contamination vertical_visibility Backscatter(backscatter) detection_status Third cloud base height(third_cbh) laser_pulse_energy time_offset range sum_backscatter

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DQRID : D050310.1

Start Date	Start Time	End Date	End Time
02/26/2005	0600	04/01/2005	0007

Subject:	TWP/VCEIL/C2 - Ceilometer failure
DataStreams:	twpvceil25kC2.00, twpvceil25kC2.b1
Description:	Large data gaps began occurring frequently at the TWP Nauru site 26 February at 06Z. Prior to 25 February, optical cross talk errors had been observed. Beginning on 25 February, data errors were observed. By 26 February, these errors were exhibiting themselves as extended data gaps. These gaps became increasingly frequent between 2/26 and 3/4. All data are missing after 20050304.1550. The instrument was replaced on 29 March and after some subsequent configuration work, the instrument was revived just after 00Z on 1 April.
Measurements:	twpvceil25kC2.b1: sum_backscatter tilt_angle lon vertical_visibility Third cloud base height(third_cbh) Second lowest cloud base height(second_cbh) alt Backscatter(backscatter) background_light base_time receiver_sensitivity time_offset detection_status status_string laser_pulse_energy alt_highest_signal filename laser_temperature range measurement_parameters status_flag Lowest cloud base height detected.(first_cbh) window_contamination lat twpvceil25kC2.00: Raw data stream - documentation not supported

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DQRID : D050406.2

Start Date	Start Time	End Date	End Time
10/19/2004	1330	04/13/2005	2359

Subject:	SGP/VCEIL/B5 - Noisy Backscatter
DataStreams:	sgpvceil25kB5.b1
Description:	Since October of 2004, the noise in the backscatter plots occasionally become high in amplitude for periods of time lasting anywhere from an hour or so to as much as a day. This problem appears similar to a dirty window (such as the problem at B6 last week), but the fact that the plots show high amplitude for short durations of time imply that this problem is different. Cloud base height detection appears to be unaffected.
Measurements:	sgpvceil25kB5.b1: Backscatter(backscatter)

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DQRID : D050614.1

Start Date	Start Time	End Date	End Time
05/05/2005	1842	04/19/2006	1713

Subject:	SGP/VCEIL/C1 - poor signal
DataStreams:	sgpvceil25kC1.b1
Description:	When parameters were changed (set noise_h2_compensation to "ON" and units to "METERS") to correct a low amplitude problem, the backscatter plots began displaying horizontal stripes indicating detector "ringing". However, the cloud base heights are not affected. The problem was corrected when the instrument was replaced.
Measurements:	sgpvceil25kC1.b1: detection_status Backscatter(backscatter)

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DQRID : D050624.6

Start Date	Start Time	End Date	End Time
06/16/2005	0000	06/27/2005	2359

Subject:	NSA/VCEIL/C1 - Reprocess: Intermittent data and clock drift
DataStreams:	nsavceil25kC1.b1
Description:	The available processed data for the NSA.C1 VCEIL for the time period indicated are incomplete. The raw data is largely complete but pre-processing is required before these data can be reprocessed to produce a complete netcdf data set. While awaiting the reprocessed data set, the intermittent data are available from the ARM Archive. Users should be aware that the data are additionally compromised by a clock drift of at least 10 minutes, though this likely has little affect on cloud detection results. The clock drift will not be addressed by the reprocessing. Note also, that the clock drift was corrected at the end of the DQR period, but it may have existed before the beginning of the DQR period. The data for this period should be used with caution.
Measurements:	nsavceil25kC1.b1: Third cloud base height(third_cbh) alt_highest_signal receiver_sensitivity laser_temperature Second lowest cloud base height(second_cbh) Lowest cloud base height detected.(first_cbh) filename vertical_visibility tilt_angle time_offset measurement_parameters lat status_flag sum_backscatter lon range base_time alt Backscatter(backscatter) status_string background_light window_contamination detection_status laser_pulse_energy

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DQRID : D050721.2

Start Date	Start Time	End Date	End Time
01/10/2003	1725	05/10/2004	1815

Subject:	SGP/VCEIL/B4 - Detection optics degrading
DataStreams:	sgpvceil25kB4.b1
Description:	Backscatter plots exhibited horizontal striping due to electronic ringing of either the detector or the associated amplification electronics. The instrument was changed out on May 10. The ceilometer continued to correctly detected clouds during this period, though users should be aware of the degraded performance.
Measurements:	sgpvceil25kB4.b1: Backscatter(backscatter)

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DQRID : D051005.3

Start Date	Start Time	End Date	End Time
04/14/2005	0000	07/14/2005	2359

Subject:	SGP/VCEIL/B5 - Backscatter noise affects cloud detection
DataStreams:	sgpvceil25kB5.b1
Description:	Performance of the instrument degraded resulting in very noisy backscatter data to the extent that cloud detection was severely impacted beyond approximately 3 km (day and night).
Measurements:	sgpvceil25kB5.b1: Second lowest cloud base height(second_cbh) Third cloud base height(third_cbh) Lowest cloud base height detected.(first_cbh) alt_highest_signal vertical_visibility Backscatter(backscatter)

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DQRID : D051209.4

Start Date	Start Time	End Date	End Time
09/16/2005	0000	12/12/2005	0505

Subject:	TWP/VCEIL/C3 - Degraded hardware
DataStreams:	twpvceil25kC3.b1
Description:	It appears that the sensitivity of the Darwin ceilometer was degrading over a few month period leading up to September 2005. Beginning on September 16, 2005, the instrument shifted to a particularly bad state. Looking at the backscatter data, I do not see nearly as great a day-night difference in the background as I expect and there is very little sensitivity to clouds. There was cross talk error noted with that instrument. The ceilometer was replaced on December 12.
Measurements:	twpvceil25kC3.b1: Backscatter(backscatter) Second lowest cloud base height(second_cbh) Third cloud base height(third_cbh) Lowest cloud base height detected.(first_cbh) background_light alt_highest_signal vertical_visibility

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DQRID : D051209.5

Start Date	Start Time	End Date	End Time
08/30/2005	2000	12/12/2005	0346

Subject:	TWP/VCEIL/C2 - occasional communication fault
DataStreams:	twpvceil25kC2.b1
Description:	Beginning August 30, 2005, the Nauru Ceilometer periodically went into a strange operational mode where the backscatter data exhibits vertical stripes. Looking at the backscatter data - there are high amplitude oscillations occuring in the backscatter as a function of time at a given height. The phenomenon appears to be more common at night. Dates include: 30 Aug, 31 Aug, 1 Sep, 9 Sep, 15 Sep, 20 Oct, 22 Oct, 8 Dec, and others. The fiber optic link to the ceilometer was faulty and causing periodic data corruption. The problem was corrected when the fiber optic line was replaced with a hard wired RS232 link.
Measurements:	twpvceil25kC2.b1: status_string detection_status sum_backscatter laser_pulse_energy tilt_angle alt_highest_signal filename laser_temperature vertical_visibility range lon Third cloud base height(third_cbh) measurement_parameters status_flag Second lowest cloud base height(second_cbh) alt Lowest cloud base height detected.(first_cbh) background_light Backscatter(backscatter) window_contamination receiver_sensitivity base_time lat time_offset

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DQRID : D051216.6

Start Date	Start Time	End Date	End Time
09/16/2005	2300	12/12/2005	0500

Subject:	TWP/VCEIL/C3 - ceilometer lost sensitivity
DataStreams:	twpvceil25kC3.b1
Description:	ceilometer sesitivity decreased suddenly and only very strong cloud reflections are observed in the first kilometer.
Measurements:	twpvceil25kC3.b1: Backscatter(backscatter) status_string status_flag sum_backscatter Second lowest cloud base height(second_cbh) Third cloud base height(third_cbh) range Lowest cloud base height detected.(first_cbh) detection_status background_light vertical_visibility

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DQRID : D051219.1

Start Date	Start Time	End Date	End Time
12/27/2005	1930	05/02/2006	0000

Subject:	NSA/VCEIL/C1 - poor sensitivity at low altitude
DataStreams:	nsavceil25kC1.b1
Description:	The ceilometer has an internal amplifier that it sets to low or high depending on prevalant conditions. Normally, the gain is automatically set high during clear skies. It appears that during these times, a slight degradation in either the transmitter or receiver is being amplified and produces a "ripple" at low altitudes in the backscatter plot. Cloud base height detection is not affected.
Measurements:	nsavceil25kC1.b1: receiver_sensitivity Backscatter(backscatter)

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DQRID : D060113.1

Start Date	Start Time	End Date	End Time
12/12/2005	0555	05/18/2006	2300

Subject:	TWP/VCEIL/C3 - low receiver sensitivity
DataStreams:	twpvceil25kC3.b1
Description:	The ceilometer reported frequent receiver alarms. There are periods when the receiver sensitivity dropped to about 50%. The problem was corrected by replacing the instrument with a spare.
Measurements:	twpvceil25kC3.b1: receiver_sensitivity Backscatter(backscatter) sum_backscatter Second lowest cloud base height(second_cbh) Third cloud base height(third_cbh) Lowest cloud base height detected.(first_cbh) background_light alt_highest_signal vertical_visibility

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DQRID : D060517.3

Start Date	Start Time	End Date	End Time
05/13/2006	2249	05/15/2006	0410

Subject:	TWP/VCEIL/C2 - Vceil computer disconnected
DataStreams:	twpvceil25kC2.b1
Description:	VCEIL computer was disconnected during this time period.
Measurements:	twpvceil25kC2.b1: status_string detection_status sum_backscatter laser_pulse_energy tilt_angle alt_highest_signal filename laser_temperature vertical_visibility range Third cloud base height(third_cbh) measurement_parameters status_flag Second lowest cloud base height(second_cbh) Lowest cloud base height detected.(first_cbh) background_light Backscatter(backscatter) window_contamination base_time receiver_sensitivity time_offset

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DQRID : D060707.5

Start Date	Start Time	End Date	End Time
12/06/2004	1820	05/05/2005	1841

Subject:	SGP/VCEIL/C1 - low amplitude
DataStreams:	sgpvceil25kC1.b1
Description:	When the instrument was replaced with a spare, the backscatter plots began displaying a suspiciously low amount of amplitude (noise) but the cloud base heights were not affected. Discovered that when the vendor repaired this unit in August 2004, noise compensation was set to "OFF". Changed the parameters to "ON". Also noted that the measurement units was set to "FEET". This was changed to "METERS. The heights are not affected because the ingest recognizes the raw data units and automatically converts to meters.
Measurements:	sgpvceil25kC1.b1: Backscatter(backscatter)

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DQRID : D060717.5

Start Date	Start Time	End Date	End Time
05/13/2006	2224	07/17/2006	1912

Subject:	TWP/VCEIL/C2 - Time offset
DataStreams:	twpvceil25kC2.b1
Description:	On 7/14/2006, I found that the ceilometer time was 8m 36s slow, the PC time display (lower right taskbar) was frozen at "22:24", and AboutTime was not running. Corrected it on 7/17 by running AboutTime so that 19:03:29 became 19:12:05. This also corrected the frozen display on the Windows98 taskbar. I am not sure of the start time of this problem but there were several other Windows related issues that had to be corrected on 5/14 with indications of inappropriate access via Remote Administrator on 5/13. I do not know if the time offset was a sudden or gradual change.
Measurements:	twpvceil25kC2.b1: status_string detection_status sum_backscatter laser_pulse_energy tilt_angle alt_highest_signal laser_temperature vertical_visibility range Third cloud base height(third_cbh) measurement_parameters Second lowest cloud base height(second_cbh) status_flag Lowest cloud base height detected.(first_cbh) background_light Backscatter(backscatter) window_contamination base_time receiver_sensitivity time_offset

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DQRID : D061220.34

Start Date	Start Time	End Date	End Time
05/18/2006	2300	12/20/2006	0400

Subject:	TWP/VCEIL/C3 - standard instrument installed
DataStreams:	twpvceil25kC3.b1
Description:	A spare ceilometer without the tropics window option was installed. The manufacturer recommends the tropics window be used at +/- 25 deg lattitude to prevent direct solar radiation into the laser optics when the instrument pointed at zenith. No significant signal degradation is apparent during the autumnal equinox but, as a precaution, the unit was replaced with the original with a tropics window.
Measurements:	twpvceil25kC3.b1: Backscatter(backscatter) laser_pulse_energy laser_temperature sum_backscatter background_light vertical_visibility

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DQRID : D070201.1

Start Date	Start Time	End Date	End Time
12/20/2006	0401	01/12/2007	0120

Subject:	TWP/VCEIL/C3 - Reduced sensitivity to high clouds
DataStreams:	twpvceil25kC3.b1
Description:	The instrument produced a significant number of optical cross-talk warnings and displayed a reduced capacity to detect high clouds. The internal cables were inspected, the compensation fiber and optics monitor were replaced, the crosstalk compensation was adjusted, and the system tested with an optical termination hood, all with no improvement. While waiting for a new receiver board, receiver ribbon cable, and compensation fiber cable from Vaisala, a spare ceilometer with a standard, "non-tropics", window was installed.
Measurements:	twpvceil25kC3.b1: receiver_sensitivity Second lowest cloud base height(second_cbh) Third cloud base height(third_cbh) detection_status alt_highest_signal

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DQRID : D070201.2

Start Date	Start Time	End Date	End Time
12/13/2006	0000	02/05/2007	0028

Subject:	TWP/VCEIL/C2 - optical cross-talk compensation
DataStreams:	twpvceil25kC2.b1
Description:	The ceilometer gave frequent optical cross-talk compensation warnings, was insensitive to high clouds, and the tropics window was deteriorated. The instrument was replaced with a spare.
Measurements:	twpvceil25kC2.b1: Second lowest cloud base height(second_cbh) alt_highest_signal Backscatter(backscatter) window_contamination vertical_visibility Third cloud base height(third_cbh)

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DQRID : D070219.1

Start Date	Start Time	End Date	End Time
02/08/2007	1500	02/27/2007	2035

Subject:	SGP/VCEIL/B6 - contaminated window
DataStreams:	sgpvceil25kB6.b1
Description:	Backscatter has consistently high amplitude because the window was dirty. The problem was corrected when the window was cleaned.
Measurements:	sgpvceil25kB6.b1: Third cloud base height(third_cbh) Lowest cloud base height detected.(first_cbh) Second lowest cloud base height(second_cbh) Backscatter(backscatter)

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DQRID : D070329.1

Start Date	Start Time	End Date	End Time
03/11/2007	2120	04/17/2007	2325

Subject:	TWP/VCEIL/C2 - Receiver failure
DataStreams:	twpvceil25kC2.b1
Description:	The receiver failed and the instrument was replaced. Data during the specified period are not valid.
Measurements:	twpvceil25kC2.b1: sum_backscatter Second lowest cloud base height(second_cbh) Lowest cloud base height detected.(first_cbh) alt_highest_signal Backscatter(backscatter) background_light vertical_visibility Third cloud base height(third_cbh)

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DQRID : D070503.3

Start Date	Start Time	End Date	End Time
04/18/2007	1630	07/11/2007	0550

Subject:	TWP/VCEIL/C3 - Reduced sensitivity to high clouds
DataStreams:	twpvceil25kC3.b1
Description:	The instrument had reduced sensitivity to high clouds. The instrument produced a significant number of optical cross-talk warnings and displayed a reduced capacity to detect high clouds. The window was cleaned and the instrument was power-cycled but with no improvement. Diagnostics indicated the problem was with the compensation fiber cable. The problem was corrected by replacing this standard-window instrument (that was tilted at 16 degrees) with a tropics unit that became available.
Measurements:	twpvceil25kC3.b1: receiver_sensitivity Second lowest cloud base height(second_cbh) Third cloud base height(third_cbh) alt_highest_signal vertical_visibility

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DQRID : D070522.1

Start Date	Start Time	End Date	End Time
05/10/2007	2330	05/22/2007	1930

Subject:	SGP/VCEIL/B6 - contaminated window
DataStreams:	sgpvceil25kB6.b1
Description:	The window was contamined with bird droppings producing a status warning and causing the backscatter plot to have a higher than normal amplitude. The problem was corrected when the window was cleaned during regular preventative maintenance.
Measurements:	sgpvceil25kB6.b1: Third cloud base height(third_cbh) Lowest cloud base height detected.(first_cbh) Second lowest cloud base height(second_cbh) sum_backscatter Backscatter(backscatter) alt_highest_signal vertical_visibility

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DQRID : D071101.2

Start Date	Start Time	End Date	End Time
10/25/2007	0630	11/08/2007	1729

Subject:	SGP/VCEIL/B5 - Degraded hardware
DataStreams:	sgpvceil25kB5.b1
Description:	Following repair at Vaisala and re-installation on 10/23/2007, the ceilometer experiencing intermittent receiver alarms and discontinuities in the backscatter plot. Vaisala recommended the old firmware card be replaced but that did not resolve the problems. The instrument was replaced with a spare and returned to the vendor for repair.
Measurements:	sgpvceil25kB5.b1: detection_status laser_temperature Third cloud base height(third_cbh) status_flag background_light vertical_visibility Backscatter(backscatter) range sum_backscatter Second lowest cloud base height(second_cbh) receiver_sensitivity status_string measurement_parameters alt_highest_signal Lowest cloud base height detected.(first_cbh) laser_pulse_energy window_contamination tilt_angle

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DQRID : D080924.4

Start Date	Start Time	End Date	End Time
03/08/2002	1859	03/11/2002	2013
09/23/2008	2033	09/25/2008	1945

Subject:	SGP/VCEIL/B5 - Missing data
DataStreams:	sgpvceil25kB5.b1
Description:	Data are missing and unrecoverable.
Measurements:	sgpvceil25kB5.b1: detection_status laser_temperature Third cloud base height(third_cbh) base_time status_flag lat background_light vertical_visibility Backscatter(backscatter) range sum_backscatter Second lowest cloud base height(second_cbh) lon receiver_sensitivity status_string measurement_parameters alt_highest_signal Lowest cloud base height detected.(first_cbh) laser_pulse_energy window_contamination time_offset tilt_angle alt

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DQRID : D090108.1

Start Date	Start Time	End Date	End Time
12/10/2008	1530	04/07/2009	1530

Subject:	SGP/VCEIL/B4 - Window contamination
DataStreams:	sgpvceil25kB4.b1
Description:	During this period, the VCEIL window repeatedly became contaminated by bird droppings shortly after each cleaning. Detection of clouds was intermittently limited. The window warnings are contained in the status_flag data. The cleaning frequency was increased and then bird deterrent spikes were installed on 3/24/2009. Cloud height measurements are suspect when the status_string field contains the "Window contaminated" warning.
Measurements:	sgpvceil25kB4.b1: Backscatter(backscatter) Lowest cloud base height detected.(first_cbh) Third cloud base height(third_cbh) Second lowest cloud base height(second_cbh) vertical_visibility

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DQRID : D090507.2

Start Date	Start Time	End Date	End Time
04/22/2009	0925	05/16/2009	1010

Subject:	GRW/VCEIL/M1 - Receiver failure
DataStreams:	grwvceil25kM1.b1
Description:	The AMF VCEIL had lower-than-normal laser transmitter power, ~84%, so the instrument was replaced with a spare on 4/22. The spare VCEIL had just been repaired but began to display receiver failure warnings. Diagnostic information was sent to Vaisala and we discussed either replacing the receiver with the one from the original VCEIL (with the degraded transmitter) or replacing the transmitter in the original VCEIL with the one from the spare. Vaisala recommended the latter because the original VCEIL is a much newer unit. On 5/16, the site operator replaced the transmitter in the original VCEIL with the one from the spare, realigned the optics, recalibrated the laser, and put the instrument back into service, successfully correcting the problem. The data during this period were intermittently incorrect, containing warning flags and alarms and unreasonable cloud base heights.
Measurements:	grwvceil25kM1.b1: vertical_visibility Lowest cloud base height detected.(first_cbh) background_light Backscatter(backscatter) Third cloud base height(third_cbh) Second lowest cloud base height(second_cbh) alt_highest_signal

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DQRID : D090527.1

Start Date	Start Time	End Date	End Time
05/25/2009	1540	06/29/2009	0000

Subject:	TWP/VCEIL/C1 - Compensation fiber
DataStreams:	twpvceil25kC1.b1
Description:	The VCEIL was reporting a "receiver optical cross-talk compensation is poor" warning. The window was cleaned and the instrument was power-cycled. The problem was corrected when the compensation fiber was replaced and ants were removed from communication connector. Cloud detection was impaired.
Measurements:	twpvceil25kC1.b1: Second lowest cloud base height(second_cbh) alt_highest_signal sum_backscatter receiver_sensitivity laser_pulse_energy Lowest cloud base height detected.(first_cbh) vertical_visibility Third cloud base height(third_cbh) Backscatter(backscatter) background_light

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DQRID : D091026.1

Start Date	Start Time	End Date	End Time
04/01/2001	0000	10/20/2009	1227

Subject:	SGP/VCEIL/B1 - Warning flag
DataStreams:	sgpvceil25kB1.b1
Description:	Beginning in 2000 (when this datastream was named sgpvceil25kB1.a1), the ceilometer was continuously giving warnings for low battery or charge voltage. Either the battery switch may not have been "ON" or the battery needed to be replaced. Attempts to correct the problem were unsuccessful until the time of site decommissioning. Maintenance efforts ceased 10/1/2009 and the battery was not checked prior to the site being decommissioned on 10/20/2009.
Measurements:	sgpvceil25kB1.b1: status_flag

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DQRID : D091210.1

Start Date	Start Time	End Date	End Time
05/02/2006	0000	12/03/2009	2107

Subject:	NSA/VCEIL/C1 - Degraded window
DataStreams:	nsavceil25kC1.b1
Description:	The ceilometer continuously gave warnings for window contamination because the window had deteriorated. Cloud base height detection did not appear to be significantly affected. The window conditioner was replaced on 8/11/09 but this did not clear the warning. The instrument was replaced.
Measurements:	nsavceil25kC1.b1: Third cloud base height(third_cbh) alt_highest_signal Second lowest cloud base height(second_cbh) status_flag sum_backscatter Lowest cloud base height detected.(first_cbh) Backscatter(backscatter) status_string background_light vertical_visibility window_contamination

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DQRID : D100125.2

Start Date	Start Time	End Date	End Time
01/23/2010	0600	01/25/2010	2041

Subject:	NSA/VCEIL/C1 - Missing data
DataStreams:	nsavceil25kC1.b1
Description:	Data are missing and unrecoverable.
Measurements:	nsavceil25kC1.b1: Third cloud base height(third_cbh) alt_highest_signal receiver_sensitivity laser_temperature Second lowest cloud base height(second_cbh) Lowest cloud base height detected.(first_cbh) filename vertical_visibility tilt_angle time_offset measurement_parameters lat status_flag sum_backscatter lon range base_time alt Backscatter(backscatter) status_string background_light window_contamination detection_status laser_pulse_energy

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DQRID : D100215.1

Start Date	Start Time	End Date	End Time
04/01/2001	0000	10/31/2009	2359

Subject:	SGP/VCEIL/C1/B4/B5/B6 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:	sgpvceil25kB4.b1, sgpvceil25kB5.b1, sgpvceil25kB6.b1, sgpvceil25kC1.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad. This DQR also applies to a1 level data collected prior to b1 level.
Measurements:	sgpvceil25kC1.b1: sum_backscatter sgpvceil25kB4.b1: sum_backscatter sgpvceil25kB6.b1: sum_backscatter sgpvceil25kB5.b1: sum_backscatter

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DQRID : D100215.2

Start Date	Start Time	End Date	End Time
04/01/2001	0000	10/21/2009	2359

Subject:	SGP/VCEIL/B1 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:	sgpvceil25kB1.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad. This DQR also applies to a1 level data collected prior to b1 level.
Measurements:	sgpvceil25kB1.b1: sum_backscatter

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DQRID : D100215.3

Start Date	Start Time	End Date	End Time
08/22/1999	0000	10/31/2009	2359

Subject:	NSA/VCEIL/C1/C2 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:	nsavceil25kC1.b1, nsavceil25kC2.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad. This DQR also applies to a1 and b1 level data collected prior to the begin date.
Measurements:	nsavceil25kC2.b1: sum_backscatter nsavceil25kC1.b1: sum_backscatter

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DQRID : D100215.4

Start Date	Start Time	End Date	End Time
10/11/1996	0000	10/31/2009	2359

Subject:	TWP/VCEIL/C1 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:	twpvceil25kC1.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad. This DQR also applies to a1 level data.
Measurements:	twpvceil25kC1.b1: sum_backscatter

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DQRID : D100215.5

Start Date	Start Time	End Date	End Time
10/28/1998	0000	10/31/2009	2359

Subject:	TWP/VCEIL/C2 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:	twpvceil25kC2.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad. This DQR also applies to a1 level data.
Measurements:	twpvceil25kC2.b1: sum_backscatter

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DQRID : D100215.6

Start Date	Start Time	End Date	End Time
02/27/2002	0000	10/31/2009	2359

Subject:	TWP/VCEIL/C3 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:	twpvceil25kC3.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad. This DQR also applies to a1 level data.
Measurements:	twpvceil25kC3.b1: sum_backscatter

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DQRID : D100216.2

Start Date	Start Time	End Date	End Time
02/01/2005	0000	09/15/2005	2359

Subject:	PYE/VCEIL/M1 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:	pyevceil25kM1.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad.
Measurements:	pyevceil25kM1.b1: sum_backscatter

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DQRID : D100216.3

Start Date	Start Time	End Date	End Time
11/23/2005	0000	01/07/2007	2359

Subject:	NIM/VCEIL/M1 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:	nimvceil25kM1.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad.
Measurements:	nimvceil25kM1.b1: sum_backscatter

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DQRID : D100216.4

Start Date	Start Time	End Date	End Time
03/12/2007	0000	01/01/2008	2359

Subject:	FKB/VCEIL/M1 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:	fkbvceil25kM1.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad.
Measurements:	fkbvceil25kM1.b1: sum_backscatter

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DQRID : D100216.5

Start Date	Start Time	End Date	End Time
05/08/2008	0000	12/28/2008	2359

Subject:	HFE/VCEIL/M1 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:	hfevceil25kM1.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad.
Measurements:	hfevceil25kM1.b1: sum_backscatter

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DQRID : D100216.6

Start Date	Start Time	End Date	End Time
04/13/2009	0000	10/31/2009	2359

Subject:	GRW/VCEIL/M1 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:	grwvceil25kM1.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad.
Measurements:	grwvceil25kM1.b1: sum_backscatter

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DQRID : D100225.2

Start Date	Start Time	End Date	End Time
10/06/2008	0000	12/13/2008	2359

Subject:	HFE/VCEIL/S1 - Incorrect serial_number and sum_backscatter fields
DataStreams:	hfevceil25kS1.b1
Description:	Attribute serial_number: In most cases, this field is not representative of the actual serial number of the instrument because the value did not change when an instrument changed locations or was replaced with a spare. Variable sum_backscatter: An out-of-range condition for the "sum of detected and normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 0.0999 /srad.
Measurements:	hfevceil25kS1.b1: sum_backscatter

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DQRID : D100514.1

Start Date	Start Time	End Date	End Time
04/16/2010	2202	04/23/2010	2241

Subject:	SGP/VCEIL/C1 - Range normalization
DataStreams:	sgpvceil25kC1.b1
Description:	The range gate data were not normalized during this period because, when the CL31 was first deployed, I was uncertain about this parameter and returned it to its default setting of "off". Range gate normalization was enabled after receiving the following from Vaisala: ''We do recommend to keep this 'profile noise_h2' setting on. If 'profile noise_h2' is off, then range correction of the signal would freeze at 2400 m, unless the algorithm has detected a cloud region. This had been designed to make profiles in CL-VIEW look less noisy and to emphasize the presence of clouds.''
Measurements:	sgpvceil25kC1.b1: Lowest cloud base height detected.(first_cbh) vertical_visibility alt_highest_signal Second lowest cloud base height(second_cbh) Backscatter(backscatter) Third cloud base height(third_cbh)

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DQRID : D100616.2

Start Date	Start Time	End Date	End Time
12/03/2009	2107	06/15/2010	2143

Subject:	NSA/VCEIL/C1 - Small gaps in data
DataStreams:	nsavceil25kC1.b1
Description:	When the ceilometer was replaced, small gaps in the netCDF files occurred due to the presence of '?' characters in the backscatter and header records of the raw data that could not be ingested. It is unknown whether this was caused by a poor CPU board or incompatibilities with the computer configuration (hyper-threading). The problem was corrected when the instrument and computer were both replaced. During this period, approximately 3% of data are missing each hour due to this problem.
Measurements:	nsavceil25kC1.b1: Third cloud base height(third_cbh) alt_highest_signal laser_temperature receiver_sensitivity Second lowest cloud base height(second_cbh) Lowest cloud base height detected.(first_cbh) vertical_visibility tilt_angle time_offset measurement_parameters status_flag sum_backscatter range base_time Backscatter(backscatter) status_string background_light window_contamination detection_status laser_pulse_energy

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DQRID : D100719.1

Start Date	Start Time	End Date	End Time
06/15/2010	2159	06/17/2010	2201

Subject:	NSA/VCEIL/C1 - Gaps in data
DataStreams:	nsavceil25kC1.b1
Description:	When the CT25K ceilometer was replaced with a new CL31, checksum errors began occurring at regular 6-min intervals and several things were done to diagnose the problem, including changing the serial cable and trying different computer types. It was finally corrected by replacing the computer with one in which hyperthreading was disabled by default in the BIOS.
Measurements:	nsavceil25kC1.b1: Third cloud base height(third_cbh) alt_highest_signal laser_temperature receiver_sensitivity Second lowest cloud base height(second_cbh) Lowest cloud base height detected.(first_cbh) vertical_visibility tilt_angle time_offset measurement_parameters status_flag sum_backscatter range base_time Backscatter(backscatter) status_string background_light window_contamination detection_status laser_pulse_energy

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DQRID : D110318.2

Start Date	Start Time	End Date	End Time
12/07/1996	0900	02/18/1997	0340
03/05/1997	1600	04/07/1997	0009
10/01/1999	0900	10/17/1999	2359
01/14/2000	0800	01/27/2000	2334
11/28/2001	0400	12/03/2001	0552
01/07/2003	0706	01/16/2003	0156
04/30/2003	2300	05/02/2003	0710
12/24/2010	1613	01/10/2011	0441
03/16/2011	1229	03/18/2011	1607
05/14/2011	0600	05/25/2011	0150
07/16/2011	2200	08/03/2011	0026
05/28/1998	0000	05/29/1998	2359
11/01/1998	2200	11/03/1998	2021
11/20/1998	0200	11/27/1998	1010
09/03/1999	0300	09/07/1999	0900
04/15/1997	0100	04/18/1997	0513
04/24/1997	2300	04/26/1997	0034
04/29/1997	2200	05/02/1997	2359
05/06/1997	0100	05/10/1997	1952
06/04/1997	0600	06/11/1997	1030
06/13/1997	1200	06/15/1997	0333
07/02/1997	1000	07/16/1997	1200
09/08/1997	0200	09/10/1997	2020
01/05/1998	0200	01/08/1998	2047
02/21/1998	2100	04/19/1998	0647
11/29/1996	0100	11/30/1996	2359
11/14/1996	0900	11/19/1996	2359

Subject:	TWP/VCEIL/C1 - Missing data
DataStreams:	twpvceil25kC1.b1
Description:	Data are missing and unrecoverable.
Measurements:	twpvceil25kC1.b1: Second lowest cloud base height(second_cbh) alt_highest_signal time_offset detection_status tilt_angle sum_backscatter Lowest cloud base height detected.(first_cbh) receiver_sensitivity lon status_flag filename vertical_visibility measurement_parameters range window_contamination laser_temperature lat laser_pulse_energy alt status_string Third cloud base height(third_cbh) base_time Backscatter(backscatter) background_light

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DQRID : D120524.7

Start Date	Start Time	End Date	End Time
04/17/2012	1513	04/18/2012	1546

Subject:	SGP/VCEIL/C1 - Contaminated window
DataStreams:	sgpvceil25kC1.b1
Description:	Alarm shown: Light Path Obstruction and Window Contamination. Window condition was 2%. Observed massive amounts of bird droppings on window. Cleaned window and shortly after window condition had risen to 94% and alarm was cleared.
Measurements:	sgpvceil25kC1.b1: Lowest cloud base height detected.(first_cbh) vertical_visibility sum_backscatter alt_highest_signal background_light Second lowest cloud base height(second_cbh) detection_status Backscatter(backscatter) Third cloud base height(third_cbh)

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END OF DATA