FKB/MET/M1 - Optical Rain Gauge Data Incorrect

The Optical Raingauge (ORG) data was incorrect during the listed times.  Ice/frost was 
forming on the lenses causing the ORG to believe there was precipitation occurring.

• Precipitation rate standard deviation(precip_rate_sd)
• Precipitation rate mean(precip_rate_mean)
• Precipitation rate maximum(precip_rate_max)
• Precipitation rate minimum(precip_rate_min)

FKB/MET/M1 - ORG Data incorrect during calibration

The ORG data was incorrect during calibration checks.  The check mimics a precipiation 
event so the precip amounts that were collected were not actually measured.

• Precipitation rate standard deviation(precip_rate_sd)
• Precipitation rate mean(precip_rate_mean)
• Precipitation rate maximum(precip_rate_max)
• Precipitation rate minimum(precip_rate_min)

FKB/MFRSR/M1 - Reprocessed: Calibration error

Incorrect calibrations were originally applied to these data.  The data were reprocessed 
and archived in December 2007.

There is a problem with channel 673.  Numerous drop outs occur throughout the period 
covered by this DQR.

• Direct Normal Narrowband Irradiance, Filter 4(direct_normal_narrowband_filter4)
• Narrowband Direct Horizontal Irradiance, Filter 4(direct_horizontal_narrowband_filter4)
• Narrowband Hemispheric Irradiance, Filter 4(hemisp_narrowband_filter4)
• Cosine correction applied to direct_horizontal_narrowband_filter4(computed_cosine_correction_filter4)
• Ratio of direct_normal_narrowband_filter4 to diffuse_hemisp_narrowband_filter4(direct_diffuse_ratio_filter4)
• Narrowband Diffuse Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4)
• Alltime Narrowband Hemispheric Irradiance, Filter 4(alltime_hemisp_narrowband_filter4)

• Alltime Narrowband Hemispheric Irradiance, Filter 4(alltime_hemisp_narrowband_filter4)
• Narrowband Diffuse Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4)
• Narrowband Direct Horizontal Irradiance, Filter 4(direct_horizontal_narrowband_filter4)
• Narrowband Hemispheric Irradiance, Filter 4(hemisp_narrowband_filter4)
• Diffuse Narrowband Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4_raw)
• Narrowband Hemispheric Irradiance, Filter 4(hemisp_narrowband_filter4_raw)

FKB/MET/M1 - Optical Rain Gauge Data Incorrect

Precipitation was being reported on days with no rain.  Problems with the grounding and 
the orientation of the receiver facing south (sunlight in the optics) caused erroneous 
readings.

• Precipitation rate standard deviation(precip_rate_sd)
• Precipitation rate mean(precip_rate_mean)
• ORG carrier mean(org_carrier_mean)
• Precipitation rate maximum(precip_rate_max)
• Precipitation rate minimum(precip_rate_min)

FKB/MFRSR/M1 - Heater not functioning

Flagging as suspect since the heater isn't working.  Head should be at 40 deg C but heater 
was not functioning due to a bad connection.  Maintenance resolved the issue.

• null(Raw data stream - documentation not supported)

• Cosine correction applied to direct_horizontal_narrowband_filter6(computed_cosine_correction_filter6)
• Time offset of tweaks from base_time(time_offset)
• Normalized filter function data, filter 5, measured transmittance value obtained
  during bench calibrations(normalized_transmittance_filter5)
• Nominal calibration factor, applied to filter1 data(nominal_calibration_factor_filter1)
• Narrowband Diffuse Hemispheric Irradiance, Filter 3(diffuse_hemisp_narrowband_filter3)
• cosine correction, south to north, filter5(cosine_correction_sn_filter5)
• Alltime Narrowband Hemispheric Irradiance, Filter 1(alltime_hemisp_narrowband_filter1)
• Narrowband Hemispheric Irradiance, Filter 2(hemisp_narrowband_filter2)
• Narrowband Hemispheric Irradiance, Filter 1(hemisp_narrowband_filter1)
• cosine correction, west to east, filter4(cosine_correction_we_filter4)
• Direct Normal Narrowband Irradiance, Filter 3(direct_normal_narrowband_filter3)
• cosine correction, south to north, filter3(cosine_correction_sn_filter3)
• cosine correction, south to north, filter2(cosine_correction_sn_filter2)
• cosine correction, west to east, filter1(cosine_correction_we_filter1)
• base time(base_time)
• Cosine correction of broadband diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_broadband)
• lon(lon)
• Dummy altitude for Zeb(alt)
• cosine correction, west to east, filter3(cosine_correction_we_filter3)
• cosine correction, west to east, broadband channel(cosine_correction_we_broadband)
• Hemispheric Irradiance, MFRSR(hemisp_broadband)
• Cosine correction of filter1 diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_filter1)
• cosine correction, south to north, broadband channel(cosine_correction_sn_broadband)
• Normalized filter function data, filter 6, wavelength value obtained during
  bench calibrations(wavelength_filter6)
• Nominal calibration factor, applied to filter4 data(nominal_calibration_factor_filter4)
• Ratio of direct_normal_narrowband_filter5 to diffuse_hemisp_narrowband_filter5(direct_diffuse_ratio_filter5)
• Ratio of direct_normal_narrowband_filter4 to diffuse_hemisp_narrowband_filter4(direct_diffuse_ratio_filter4)
• Narrowband Diffuse Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4)
• Narrowband Diffuse Hemispheric Irradiance, Filter 5(diffuse_hemisp_narrowband_filter5)
• Normalized filter function data, filter 3, wavelength value obtained during
  bench calibrations(wavelength_filter3)
• cosine correction, south to north, filter1(cosine_correction_sn_filter1)
• cosine correction, west to east, filter6(cosine_correction_we_filter6)
• Normalized filter function data, filter 4, wavelength value obtained during
  bench calibrations(wavelength_filter4)
• Nominal calibration factor, applied to broadband data(nominal_calibration_factor_broadband)
• Alltime Narrowband Hemispheric Irradiance, Filter 4(alltime_hemisp_narrowband_filter4)
• Direct Normal Narrowband Irradiance, Filter 5(direct_normal_narrowband_filter5)
• Alltime Hemispheric Broadband Irradiance(alltime_hemisp_broadband)
• Narrowband Direct Horizontal Irradiance, Filter 1(direct_horizontal_narrowband_filter1)
• Logger panel temperature(logger_temp)
• Cosine correction of filter2 diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_filter2)
• Narrowband Direct Horizontal Irradiance, Filter 2(direct_horizontal_narrowband_filter2)
• Normalized filter function data, filter 5, wavelength value obtained during
  bench calibrations(wavelength_filter5)
• Offset subtracted from upwelling hemispheric filter3 data(offset_filter3)
• Alltime Narrowband Hemispheric Irradiance, Filter 5(alltime_hemisp_narrowband_filter5)
• Nominal calibration factor, applied to filter2 data(nominal_calibration_factor_filter2)
• cosine correction, south to north, filter4(cosine_correction_sn_filter4)
• Direct Normal Narrowband Irradiance, Filter 2(direct_normal_narrowband_filter2)
• Air mass(airmass)
• Nominal calibration factor, applied to filter5 data(nominal_calibration_factor_filter5)
• Cosine correction applied to direct_horizontal_narrowband_filter2(computed_cosine_correction_filter2)
• Direct Normal Narrowband Irradiance, Filter 6(direct_normal_narrowband_filter6)
• Direct Normal Narrowband Irradiance, Filter 1(direct_normal_narrowband_filter1)
• Narrowband Diffuse Hemispheric Irradiance, Filter 2(diffuse_hemisp_narrowband_filter2)
• Nominal calibration factor, applied to filter6 data(nominal_calibration_factor_filter6)
• Offset subtracted from upwelling hemispheric filter2 data(offset_filter2)
• Ratio of direct_normal_narrowband_filter6 to diffuse_hemisp_narrowband_filter6(direct_diffuse_ratio_filter6)
• Cosine correction applied to direct_horizontal_narrowband_filter3(computed_cosine_correction_filter3)
• Solar zenith angle(solar_zenith_angle)
• Narrowband Direct Horizontal Irradiance, Filter 3(direct_horizontal_narrowband_filter3)
• Cosine correction applied to direct_horizontal_narrowband_filter1(computed_cosine_correction_filter1)
• Offset subtracted from upwelling hemispheric broadband data(offset_broadband)
• Cosine correction of filter3 diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_filter3)
• Cosine correction of filter4 diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_filter4)
• lat(lat)
• Cosine correction applied to direct_horizontal_broadband(computed_cosine_correction_broadband)
• angle of incidence during cosine bench measurements(bench_angle)
• Ratio of direct_normal_narrowband_filter3 to diffuse_hemisp_narrowband_filter3(direct_diffuse_ratio_filter3)
• cosine correction, south to north, filter6(cosine_correction_sn_filter6)
• time(time)
• Narrowband Direct Horizontal Irradiance, Filter 4(direct_horizontal_narrowband_filter4)
• Direct Normal Narrowband Irradiance, Filter 4(direct_normal_narrowband_filter4)
• Nominal calibration factor, applied to filter3 data(nominal_calibration_factor_filter3)
• Alltime Narrowband Hemispheric Irradiance, Filter 3(alltime_hemisp_narrowband_filter3)
• Cosine correction of filter5 diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_filter5)
• Normalized filter function data, filter 1, measured transmittance value obtained
  during bench calibrations(normalized_transmittance_filter1)
• Alltime Narrowband Hemispheric Irradiance, Filter 2(alltime_hemisp_narrowband_filter2)
• Second Detector Temperature(head_temp2)
• Narrowband Direct Horizontal Irradiance, Filter 6(direct_horizontal_narrowband_filter6)
• Detector Temperature(head_temp)
• Cosine correction of filter6 diffuse, assuming Rayleigh sky at 45 deg zenith
  angle(diffuse_correction_filter6)
• Ratio of direct_normal_narrowband_filter2 to diffuse_hemisp_narrowband_filter2(direct_diffuse_ratio_filter2)
• Normalized filter function data, filter 2, measured transmittance value obtained
  during bench calibrations(normalized_transmittance_filter2)
• Narrowband Direct Horizontal Irradiance, Filter 5(direct_horizontal_narrowband_filter5)
• Narrowband Hemispheric Irradiance, Filter 4(hemisp_narrowband_filter4)
• cosine correction, west to east, filter5(cosine_correction_we_filter5)
• Elevation Angle(elevation_angle)
• Data Logger Supply Voltage(logger_volt)
• Alltime Narrowband Hemispheric Irradiance, Filter 6(alltime_hemisp_narrowband_filter6)
• Narrowband Diffuse Hemispheric Irradiance, Filter 1(diffuse_hemisp_narrowband_filter1)
• Offset subtracted from upwelling hemispheric filter5 data(offset_filter5)
• cosine correction, west to east, filter2(cosine_correction_we_filter2)
• Direct Horizontal Broadband Irradiance, broadband scale applied(direct_horizontal_broadband)
• Narrowband Diffuse Hemispheric Irradiance, Filter 6(diffuse_hemisp_narrowband_filter6)
• Offset subtracted from upwelling hemispheric filter4 data(offset_filter4)
• Cosine correction applied to direct_horizontal_narrowband_filter5(computed_cosine_correction_filter5)
• Cosine correction applied to direct_horizontal_narrowband_filter4(computed_cosine_correction_filter4)
• Direct Normal Broadband Irradiance broadband scale applied(direct_normal_broadband)
• Diffuse Hemispheric Broadband Irradiance (Approximate), MFRSR(diffuse_hemisp_broadband)
• Normalized filter function data, filter 6, measured transmittance value obtained
  during bench calibrations(normalized_transmittance_filter6)
• Narrowband Hemispheric Irradiance, Filter 6(hemisp_narrowband_filter6)
• Normalized filter function data, filter 2, wavelength value obtained during
  bench calibrations(wavelength_filter2)
• Cosine of Solar Zenith Angle(cosine_solar_zenith_angle)
• Narrowband Hemispheric Irradiance, Filter 3(hemisp_narrowband_filter3)
• Offset subtracted from upwelling hemispheric filter6 data(offset_filter6)
• Normalized filter function data, filter 1, wavelength value obtained during
  bench calibrations(wavelength_filter1)
• Narrowband Hemispheric Irradiance, Filter 5(hemisp_narrowband_filter5)
• Azimuth angle(azimuth_angle)
• Ratio of direct_normal_broadband to diffuse_hemisp_broadband(direct_diffuse_ratio_broadband)
• Offset subtracted from upwelling hemispheric filter1 data(offset_filter1)
• Normalized filter function data, filter 4, measured transmittance value obtained
  during bench calibrations(normalized_transmittance_filter4)
• Ratio of direct_normal_narrowband_filter1 to diffuse_hemisp_narrowband_filter1(direct_diffuse_ratio_filter1)
• Normalized filter function data, filter 3, measured transmittance value obtained
  during bench calibrations(normalized_transmittance_filter3)

• Narrowband Diffuse Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4)
• Narrowband Diffuse Hemispheric Irradiance, Filter 5(diffuse_hemisp_narrowband_filter5)
• Narrowband Hemispheric Irradiance, Filter 3(hemisp_narrowband_filter3_raw)
• Offset subtracted from upwelling hemispheric filter4 data(offset_filter4)
• Narrowband Hemispheric Irradiance, Filter 1(hemisp_narrowband_filter1_raw)
• Alltime Narrowband Hemispheric Irradiance, Filter 4(alltime_hemisp_narrowband_filter4)
• Diffuse Narrowband Hemispheric Irradiance, Filter 5(diffuse_hemisp_narrowband_filter5_raw)
• Data Logger Supply Voltage(logger_volt)
• Narrowband Direct Horizontal Irradiance, Filter 6(direct_horizontal_narrowband_filter6)
• Alltime Narrowband Hemispheric Irradiance, Filter 3(alltime_hemisp_narrowband_filter3)
• Narrowband Hemispheric Irradiance, Filter 6(hemisp_narrowband_filter6)
• Time offset of tweaks from base_time(time_offset)
• Narrowband Hemispheric Irradiance, Filter 2(hemisp_narrowband_filter2_raw)
• Narrowband Direct Horizontal Irradiance, Filter 5(direct_horizontal_narrowband_filter5)
• Narrowband Hemispheric Irradiance, Filter 4(hemisp_narrowband_filter4_raw)
• lat(lat)
• Dummy altitude for Zeb(alt)
• base time(base_time)
• Hemispheric Irradiance, MFRSR(hemisp_broadband)
• Narrowband Hemispheric Irradiance, Filter 5(hemisp_narrowband_filter5_raw)
• Diffuse Narrowband Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4_raw)
• Offset subtracted from upwelling hemispheric broadband data(offset_broadband)
• Alltime Narrowband Hemispheric Irradiance, Filter 1(alltime_hemisp_narrowband_filter1)
• Narrowband Diffuse Hemispheric Irradiance, Filter 6(diffuse_hemisp_narrowband_filter6)
• Offset subtracted from upwelling hemispheric filter6 data(offset_filter6)
• Hemispheric Broadband Irradiance(hemisp_broadband_raw)
• Detector Temperature(head_temp)
• Diffuse Narrowband Hemispheric Irradiance, Filter 1(diffuse_hemisp_narrowband_filter1_raw)
• Diffuse Narrowband Hemispheric Irradiance, Filter 6(diffuse_hemisp_narrowband_filter6_raw)
• Alltime Hemispheric Broadband Irradiance(alltime_hemisp_broadband)
• Offset subtracted from upwelling hemispheric filter2 data(offset_filter2)
• Narrowband Diffuse Hemispheric Irradiance, Filter 1(diffuse_hemisp_narrowband_filter1)
• Diffuse Narrowband Hemispheric Irradiance, Filter 2(diffuse_hemisp_narrowband_filter2_raw)
• Alltime Narrowband Hemispheric Irradiance, Filter 2(alltime_hemisp_narrowband_filter2)
• Diffuse Hemispheric Broadband Irradiance (Approximate), MFRSR(diffuse_hemisp_broadband)
• Narrowband Direct Horizontal Irradiance, Filter 3(direct_horizontal_narrowband_filter3)
• time(time)
• Narrowband Hemispheric Irradiance, Filter 5(hemisp_narrowband_filter5)
• Narrowband Direct Horizontal Irradiance, Filter 1(direct_horizontal_narrowband_filter1)
• Offset subtracted from upwelling hemispheric filter5 data(offset_filter5)
• Narrowband Hemispheric Irradiance, Filter 2(hemisp_narrowband_filter2)
• lon(lon)
• Narrowband Direct Horizontal Irradiance, Filter 4(direct_horizontal_narrowband_filter4)
• Narrowband Diffuse Hemispheric Irradiance, Filter 2(diffuse_hemisp_narrowband_filter2)
• Narrowband Diffuse Hemispheric Irradiance, Filter 3(diffuse_hemisp_narrowband_filter3)
• Alltime Narrowband Hemispheric Irradiance, Filter 5(alltime_hemisp_narrowband_filter5)
• Offset subtracted from upwelling hemispheric filter1 data(offset_filter1)
• Logger panel temperature(logger_temp)
• Narrowband Hemispheric Irradiance, Filter 1(hemisp_narrowband_filter1)
• Diffuse Hemispheric Broadband Irradiance(diffuse_hemisp_broadband_raw)
• Alltime Narrowband Hemispheric Irradiance, Filter 6(alltime_hemisp_narrowband_filter6)
• Narrowband Hemispheric Irradiance, Filter 6(hemisp_narrowband_filter6_raw)
• Direct Horizontal Broadband Irradiance, broadband scale applied(direct_horizontal_broadband)
• Narrowband Hemispheric Irradiance, Filter 3(hemisp_narrowband_filter3)
• Offset subtracted from upwelling hemispheric filter3 data(offset_filter3)
• Narrowband Hemispheric Irradiance, Filter 4(hemisp_narrowband_filter4)
• Diffuse Narrowband Hemispheric Irradiance, Filter 3(diffuse_hemisp_narrowband_filter3_raw)
• Narrowband Direct Horizontal Irradiance, Filter 2(direct_horizontal_narrowband_filter2)
• Second Detector Temperature(head_temp2)

FKB/MWRP/M1 - Reprocess: Incorrect calibration

The software was started with the wrong calibration data.

• Derived relative humidity(relativeHumidity)
• Expected root-mean-square error in liquid water content retrieval(liquidWaterContentRmsError)
• Retrieved water vapor density(waterVaporDensity)
• Total precipitable water vapor, from microwave radiometer(totalPrecipitableWater)
• Level of free convection pressure(levelFreeConvectionPres)
• Lifting condensation level(liftingCondensationLevel)
• air temperature (NGM250 predicted)(temperature)
• Derived virtual temperature(virtualTemperature)
• Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
• Retrieved total precipitable water vapor using only 23.835 and 30.0 GHz(totalPrecipitableWater2)
• Interpolated water vapor mixing ratio(waterVaporMixingRatio)
• Expected root-mean-square error in liquid water path retrieval(liquidWaterPathRmsError)
• Level of free convection(levelFreeConvection)
• Expected root-mean-square error in liquid water path retrieval using only 23.835
  and 30.0 GHz(liquidWaterPath2RmsError)
• Microwave brightness temperature(brightnessTemperature)
• Retrieved cloud liquid water content(liquidWaterContent)
• Retrieved liquid water path(liquidWaterPath)
• Lifting condensation level pressure(liftingCondensationLevelPres)

FKB/MPL/M1 - Striping of vertical time section for signal return

Vertical stripes were showing up in the MPLPOL backscatter plots. Problem was likely 
associated with turbulence from the heating fan air blowing in front of telescope.

Data are still good for almost all uses.  In particular, cloud detection algorithms are 
unaffected.  Depolarization is seemingly unaffected.  Only in possible calculation of 
extinction will this be a possible problem.

• Attenuated backscatter(signal_return)

FKB/MWRHF/M1 - Dew formation on window

During night time, when the humidity is very high (RH ~ 100%) data are strongly affected 
by dew formation on the window. 
This results in a smooth and large (80-150 K) increase of the brightness temperature from 
early night to sunrise. Data are affected mostly at night.

• Sky brightness temperature (90 GHz)(tbsky90)
• Sky brightness temperature (150 GHz)(tbsky150)

FKB/MWRHF/M1 - Reprocess: Surface Relative Humidity too low

The surface relative humidity readings are too low when compared with the MWRP and the 
tower sensor.

• Relative humidity inside the instrument enclosure(rh)

FKB/MWRP/M1 - LN2 Calibration-

Between 1100 and 1500 there were two calibration attempts.

• Dummy altitude for Zeb(alt)
• Ambient surface absolute temperature(surfaceTemperature)
• Expected root-mean-square error in precipitable water retrieval(totalPrecipitableWaterRmsError)
• lon(lon)
• Surface water vapor density at instrument(surfaceWaterVaporDensity)
• Ambient surface relative humidity(surfaceRelativeHumidity)
• Level of free convection pressure(levelFreeConvectionPres)
• Retrieved water vapor density(waterVaporDensity)
• Convective Available Potential Energy(cape)
• Equilibrium level(equilibriumLevel)
• air temperature (NGM250 predicted)(temperature)
• Derived virtual temperature(virtualTemperature)
• Frequency(frequency)
• Interpolated water vapor mixing ratio(waterVaporMixingRatio)
• Flag indicating moisture sensor status(wetWindowFlag)
• Retrieved liquid water path(liquidWaterPath)
• Lifting condensation level pressure(liftingCondensationLevelPres)
• Expected root-mean-square error in precipitable water retrieval using only
  23.835 and 30.0 GHz(totalPrecipitableWater2RmsError)
• elevation(elevation)
• Data quality flags(dataQualityFlags)
• Derived relative humidity(relativeHumidity)
• Expected root-mean-square error in liquid water content retrieval(liquidWaterContentRmsError)
• Total precipitable water vapor, from microwave radiometer(totalPrecipitableWater)
• lat(lat)
• Lifting condensation level(liftingCondensationLevel)
• Cloud base height(cloudBaseHeight)
• Internal blackbody reference temperature(blackbodyTemperature)
• Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
• Retrieved total precipitable water vapor using only 23.835 and 30.0 GHz(totalPrecipitableWater2)
• Time offset of tweaks from base_time(time_offset)
• azimuth(azimuth)
• base time(base_time)
• time(time)
• Expected root-mean-square error in liquid water path retrieval(liquidWaterPathRmsError)
• Expected root-mean-square error in water vapor density retrieval(waterVaporDensityRmsError)
• Level of free convection(levelFreeConvection)
• Interpolated dewpoint temperature(dewpointTemperature)
• Expected root-mean-square error in liquid water path retrieval using only 23.835
  and 30.0 GHz(liquidWaterPath2RmsError)
• Microwave brightness temperature(brightnessTemperature)
• Retrieved cloud liquid water content(liquidWaterContent)
• Zenith-pointing infrared temperature at 10um(infraredTemperature)
• Ambient surface pressure(surfacePressure)
• Equilibrium level pressure(equilibriumLevelPres)
• Array of heights for the range gates(height)
• Expected root-mean-square error in temperature retrieval(temperatureRmsError)
• atmospheric pressure at mean sea level and at tropopause (NGM250 predicted)(pressure)

FKB/NFOV/M1 - Intermittent problem with channel 870

At times channel 870 is erratic.  Fortunately, it is mostly at night when it is not 
functioning properly.  The erratic behavior is infrequent until Sept when it becomes a bit more 
frequent.  Even then, however, very little daytime data are affected.

• Calibrated Zenith Radiance, 870 nm(radiance_870nm)
• Raw counts from instrument before calibration, 870 nm(raw_counts_870nm)

FKB/MWRP/M1 - Reprocessed: Updated 30-GHz calibration coefficient

On 9/17 the instrument was calibrated with liquid nitrogen. For the 30-GHz channel the 
results of calibration were not optimal and were causing a negative bias in the retrieved 
LWP.

On 10/9 the 30-GHz calibration parameters were updated with values derived from tip 
curves.

Data between 9/17 and 10/9 were reprocessed to correct the 30-GHz calibration.  
Reprocessed data were archived 20080122.

• Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
• Microwave brightness temperature(brightnessTemperature)
• Retrieved liquid water path(liquidWaterPath)

FKB/GNDRAD/M1 - Reprocessed: Incorrect calibrations

An incorrect calibration coefficient was applied to the up_short_hemispheric instrument 
(PSP) for the specified time period.  Changes in the ARM PSP calibration procedure now 
generates two different calibration coefficients for the same instrument, Cf(non "IR 
corrected")and Cfc("IR corrected").  CFc should have been applied to this instrument but CF was 
erroneously used.

The affected PSP is S/N 34292F3 Cf=117.61 (incorrect applied), Cfc(correct)=116.07W/m2/mV

These data were reprocessed and archived in March 2008.

• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Minima(up_short_hemisp_min)
• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Standard
  Deviation(up_short_hemisp_std)
• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Maxima(up_short_hemisp_max)
• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)

• Instantaneous Upwelling Shortwave Hemispheric Irradiance, Pyranometer(inst_up_short_hemisp)

FKB/MWRP/M1 - Heavy rain and fog at the site

The months of November and December have been very rainy and wet at the AMF site. During 
rain events the radiometer does not work properly because of water accumulating on the 
window. In addition condensation and fog will affect the data causing very high brightness 
temperatures. Although the instrument is equipped with rain detection system to flag bad 
data, it is important that the user pays extra attention to the quality of the data during 
periods of continuous rain, drizzle or fog by applying the quality checks and screening 
for high brightness temperatures.

• Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
• Derived relative humidity(relativeHumidity)
• Retrieved total precipitable water vapor using only 23.835 and 30.0 GHz(totalPrecipitableWater2)
• Interpolated water vapor mixing ratio(waterVaporMixingRatio)
• Total precipitable water vapor, from microwave radiometer(totalPrecipitableWater)
• Retrieved water vapor density(waterVaporDensity)
• Interpolated dewpoint temperature(dewpointTemperature)
• Microwave brightness temperature(brightnessTemperature)
• Retrieved cloud liquid water content(liquidWaterContent)
• Derived virtual temperature(virtualTemperature)
• Retrieved liquid water path(liquidWaterPath)
• air temperature (NGM250 predicted)(temperature)

FKB/MWRP/M1 - Possible slight drift of V-band calibration

During the month of November and December the bias between model computations and 
measurements for the 51.25 and 52.28 GHz channels has slightly increased to about 3 K. This might 
be due to a slight drift in the calibration of these channels.

The calibration error associated with these data is increased, to 2-3 K, for these two 
months. See this plot for a comparison of measurements (solid lines) and model (red 
dots) for the 51.25 (black), 52.28 (blue) and 53.85-GHz (green) channels.

• Microwave brightness temperature(brightnessTemperature)

FKB/MWRP/M1 - Periodic decrease in the 30-GHz brightness temperature

Starting around 12/19 until the end of December, the 30-GHz brightness temperature started 
to show a periodic oscillation between 9 and 11 AM GMT. The cause of this is probably 
thermal instability of the radiometer since it does correspond with some larger 
oscillations of the mixer temperature. During this time external temperatures displayed large 
variations going from -10 C at night to about +5 C during the day. The corresponding liquid 
water path retrievals are affected showing periodic negative values.

Liquid water path retrievals between 12/19 and 12/31 are the most affected variable since 
they are largely affected by the 30-GHz channel. A time series plot of the data will 
clearly show the periodic fluctuation of the LWP variable.

• Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
• Microwave brightness temperature(brightnessTemperature)
• Retrieved cloud liquid water content(liquidWaterContent)
• Retrieved liquid water path(liquidWaterPath)

FKB/MET/M1 - Optical Rain Gage Reporting Precip Constantly

During the time period listed the ORG reported precip consistently.  Reason unknown as 
deployment ended before resolution of problem.

• Precipitation rate standard deviation(precip_rate_sd)
• Precipitation rate mean(precip_rate_mean)
• Precipitation rate maximum(precip_rate_max)
• Precipitation rate minimum(precip_rate_min)

FKB/MWRHF/M1 - Questionable calibration

The instrument completed a tip curve calibration on June 30 and it did not calibrate again 
until Oct 13. Data during this time display large residuals (~ 6 K) when compared with 
model computations. It is likely that the tip curve calibration, although successful, 
wasn't good enough to have good accuracy.

Since this instrument is still under testing the users should use the data with caution. 
Although the accuracy of the model itself is still debated, large residuals between the 
measurements and the model between June and October are probably in large part due to the 
poor calibration.

• Sky brightness temperature (90 GHz)(tbsky90)
• Sky brightness temperature (150 GHz)(tbsky150)

FKB/MET/M1 - Reprocess: ORG Data has very small rainrate values

The ORG data is collected via analog signal and not digital.  Therefore, we
   continuously collect data even when no rain is occurring.  We also capture
   small events such as leaves, large bugs, dust, etc blowing through the
   measurement path.  Because this discrete event occurs quickly the value is
   usually captured for 1 or 2 seconds.  This value is then averaged to the
   minute producing rainrate on the order of .009 mm/hr or less.  These values
   are not indicative of rain and should be removed from the record or summing
   over long periods can bias the climate record.  We are reprocessing the data
   to remove these small values and are adjusting the collection program to
   remove them before ingest.

• Precipitation rate standard deviation(precip_rate_sd)
• Precipitation rate mean(precip_rate_mean)
• Precipitation rate maximum(precip_rate_max)
• Precipitation rate minimum(precip_rate_min)

FKB/MET/M1 - Wind Speed data contain offset due to induced voltage

The marine model of the RM Young wind sensor needs twisted pair shielded cable.  The 
manufacturer did not originally supply the pigtail with twisted pair shielded cable.  Use of 
twisted pair shielded cable for the rest of the cable run to the logger was also not 
specified.  This caused an induced voltage in the wind speed line from the wind direction 
excitation.  The induced voltage varied from sensor to sensor and probably changed anytime 
the cable was replaced or parts of the wind sensor were repaired or replaced. The induced 
voltage has been seen to vary from 0.15 m/s to as much as 1.08 m/s.

• Wind speed arithmetic standard deviation(wind_spd_arith_sd)
• Wind speed arithmetic average(wind_spd_arith_avg)
• Wind speed arithmetic maximum(wind_spd_arith_max)
• Wind speed arithmetic minimum(wind_spd_arith_min)
• Vector-averaged Wind Speed(wind_spd_vec_avg)