DQRs for Session: 151144 User:resteghiniCompleted: 06-25-2013

Data Quality Reports for Session: 151144 User: resteghini Completed: 06/25/2013

TABLE OF CONTENTS

DQR ID	Subject	Data Streams Affected
D000717.1	TWP/MWR/C1 - Rain on window	twpmwrlosC1.b1, twpmwrtipC1.a1
D030312.9	TWP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures	twpmwrlosC1.b1
D040220.1	TWP/MWR/C1 - wrong azimuth	twpmwrlosC1.b1
D050725.9	TWP/MWR/C1 - Reprocessed: Revised Retrieval Coefficients	twp5mwravgC1.c1, twpmwrlosC1.b1, twpmwrtipC1.a1
D050928.1	TWP/MWR/C1 - New software version (4.15) installed	twpmwrtipC1.a1, twpmwrlosC1.b1
D060420.6	TWP/MWR/C1 - Software Change	twpmwrlosC1.b1
D060420.9	TWP/MWR/C1 - software upgrade (version 3.29)	twpmwrlosC1.b1
D061114.2	TWP/MWR/C1 - Radiometer failure	twpmwrC1.00, twpmwrlosC1.b1, twpmwrtipC1.a1
D070105.1	TWP/MWR/C1 - Missing data	twpmwrtipC1.a1, twpmwrlosC1.b1
D070412.3	TWP/MWR/C1/C2 - Sun in the field of view	twpmwrlosC1.b1, twpmwrlosC2.b1, twpmwrtipC1.a1, twpmwrtipC2.a1
D070613.1	TWP/MWR/C1 - Intermittent data	twpmwrlosC1.b1, twpmwrtipC1.a1
D071208.1	TWP/MWR/C1 - Incorrect ambient temperature readings	twpmwrlosC1.b1, twpmwrtipC1.a1
D081013.2	TWP/MWR/C1 - Short periods of wrong ambient temperature	twpmwrlosC1.b1, twpmwrtipC1.a1
D090114.4	TWP/MWR/C1 - Ambient temperature data missing	twpmwrlosC1.b1, twpmwrtipC1.a1
D110221.2	TWP/MWR/C1 - Intermittent data due to computer problems	twpmwrtipC1.a1, twpmwrlosC1.b1
D111214.1	TWP/MWR/C1 - Rain events not flagged	twpmwrlosC1.b1, twpmwrtipC1.a1
D120625.1	TWP/MWR/C1 - Erratic surface temperature readings	twpmwrlosC1.b1, twpmwrtipC1.a1
D120917.1	TWP/MWR/C1 - Spikes in temperature sensor readings	twpmwrlosC1.b1, twpmwrtipC1.a1

DQRID : D000717.1

Start Date	Start Time	End Date	End Time
09/25/1997	0000	11/13/1997	0000
12/01/1997	0000	01/13/1998	0000
04/01/1998	0000	03/31/1999	0000

Subject:	TWP/MWR/C1 - Rain on window
DataStreams:	twpmwrlosC1.b1, twpmwrtipC1.a1
Description:	The data is subject to contamination due to rain on the sensor window and should be used with caution because the heater/blower assembly that prevents water from accumulating on the sensor's teflon window was out of commission.
Measurements:	twpmwrtipC1.a1: r23 wet_window r31 bbn23 bb31 tipsky31 bb23 tipsky23 tipn bbn31 Temperature, brightness, longwave(ir_temp) twpmwrlosC1.b1: wet_window Total liquid water along LOS path(liq) 31.4 GHz sky brightness temperature(tbsky31) Temperature, brightness, longwave(ir_temp) Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23) Total water vapor along LOS path(vap)

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DQRID : D030312.9

Start Date	Start Time	End Date	End Time
01/04/2002	2200	10/31/2002	2220

Subject:	TWP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures
DataStreams:	twpmwrlosC1.b1
Description:	Several related and recurring problems with the MWRs have been reported dating back to 1999. These problems were due to the occurrence of blackbody signals (in counts) that were half of those expected. The symptoms included noisy data, spikes in the data, negative brightness temperatures, and apparent loss of serial communication between the computer and the radiometer, which results in a self-termination of the MWR program. Because these all initially appeared to be hardware-related problems, the instrument mentor and SGP site operations personnel (1) repeatedly cleaned and replaced the fiber optic comm. components, (2) swapped radiometers, (3) sent radiometers back to Radiometrics for evaluation (which did not revealed any instrument problems), and (4) reconfigured the computer's operating system. Despite several attempts to isolate and correct it, the problem persisted. It became apparent that some component of the Windows98 configuration conflicted with the DOS-based MWR program or affected the serial port or the contents of the serial port buffer. This problem was finally corrected by upgrading the MWR software with a new Windows-compatible program.
Measurements:	twpmwrlosC1.b1: 31.4 GHz sky brightness temperature(tbsky31) Total liquid water along LOS path(liq) Total water vapor along LOS path(vap) Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)

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DQRID : D040220.1

Start Date	Start Time	End Date	End Time
10/11/1996	0000	02/18/2004	2250

Subject:	TWP/MWR/C1 - wrong azimuth
DataStreams:	twpmwrlosC1.b1
Description:	The MWR was initially installed at an azimuth angle defined as 180 degrees but the value in the configuration file was not changed from the default of 0 degrees. In examining photos taken during the installation of the AWS tower, I noticed that the MWR was rotated opposite the normal orientation. The value in the configuration file was changed to reflect the actual azimuth of the instrument.
Measurements:	twpmwrlosC1.b1: actaz

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DQRID : D050725.9

Start Date	Start Time	End Date	End Time
05/04/2002	0200	06/30/2005	2100

Subject:	TWP/MWR/C1 - Reprocessed: Revised Retrieval Coefficients
DataStreams:	twp5mwravgC1.c1, twpmwrlosC1.b1, twpmwrtipC1.a1
Description:	IN THE BEGINNING (June 1992), the retrieval coefficients used to derive the precipitable water vapor (PWV) and liquid water path (LWP) from the MWR brightness temperatures were based on the Liebe and Layton (1987) water vapor and oxygen absorption model and the Grant (1957) liquid water absorption model. Following the SHEBA experience, revised retrievals based on the more recent Rosenkranz (1998) water vapor and oxygen absorption models and the Liebe (1991) liquid waer absorption model were developed. The Rosenkranz water vapor absorption model resulted a 2 percent increase in PWV relative to the earlier Liebe and Layton model. The Liebe liquid water absorption model decreased the LWP by 10% relative to the Grant model. However, the increased oxygen absorption caused a 0.02-0.03 mm (20-30 g/m2) reduction in LWP, which was particularly significant for low LWP conditions (i.e. thin clouds encountered at SHEBA). Recently, it has been shown (Liljegren, Boukabara, Cady-Pereira, and Clough, TGARS v. 43, pp 1102-1108, 2005) that the half-width of the 22 GHz water vapor line from the HITRAN compilation, which is 5 percent smaller than the Liebe and Dillon (1969) half-width used in Rosenkranz (1998), provided a better fit to the microwave brightness temperature measurements at 5 frequencies in the range 22-30 GHz, and yielded more accurate retrievals. Accordingly, revised MWR retrieval coefficients have been developed using MONORTM, which utilizes the HITRAN compilation for its spectroscopic parameters. These new retrievals provide 3 percent less PWV and 2.6 percent greater LWP than the previous retrievals based on Rosenkranz (1998). The Rosenkranz-based retrieval coefficients became active at TWP.C1 20020504.0200. The MONORTM-based retrieval coefficients became active at TWP.C1 20050630.2100. Note: The TWP.C1 data for 19961011-20050630 have been reprocessed to apply the
Measurements:	twp5mwravgC1.c1: Total liquid water along LOS path(liq) Total water vapor along LOS path(vap) twpmwrtipC1.a1: liqtip vaptip twpmwrlosC1.b1: Total liquid water along LOS path(liq) Total water vapor along LOS path(vap)

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DQRID : D050928.1

Start Date	Start Time	End Date	End Time
10/31/2002	2200	09/13/2005	1854

Subject:	TWP/MWR/C1 - New software version (4.15) installed
DataStreams:	twpmwrtipC1.a1, twpmwrlosC1.b1
Description:	A problem began with the installation of MWR.EXE version 4.12 in October 2002. The software had been upgraded from a "DOS" to a "Windows"-compiled program to address an earlier problem. The software upgrade corrected the earlier problem but introduced a new one that caused line-of-sight observing cycles to be skipped, a 15% reduction in the number of tip curves, and saturation of CPU usage. Software versions 4.13 and 4.14 also produced these problems. The new MWR software version (4.15) was installed on 9/13/2005. As a consequence of this upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s.
Measurements:	twpmwrtipC1.a1: tnd31 tipsky31 bbn31 tbskytip31 Temperature, brightness, longwave(ir_temp) tnd23 r23 tnd31I tnd_nom23 tknd tbskytip23 tc23 tkbb1 tkbb2 r31 liqtip bb31 tkxc tc31 tnd_nom31 tkbb tipn vaptip tnd23I tkair bbn23 bb23 tipsky23 twpmwrlosC1.b1: tkair IR Brightness Temperature(sky_ir_temp) bbn23 Temperature, brightness, longwave(ir_temp) tnd31 Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23) tnd_nom31 Total liquid water along LOS path(liq) tc31 tknd bb31 tnd_nom23 sky23 tkxc sky31 tc23 tkbb bbn31 bb23 31.4 GHz sky brightness temperature(tbsky31) tnd23 Total water vapor along LOS path(vap)

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DQRID : D060420.6

Start Date	Start Time	End Date	End Time
10/11/1996	0000	02/27/1999	1200

Subject:	TWP/MWR/C1 - Software Change
DataStreams:	twpmwrlosC1.b1
Description:	The MWR operating software was changed on 27 February 1999 to provide additional functionality as described below. NEW FEATURES 1. Faster sampling rate Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs. 20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per blackbody sample and gain update.) 2. More flexible sampling strategy Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update. This permits sky samples to be acquired at intervals of 2.67 seconds for improved temporal resolution of cloud liquid water variations and better coordination with the millimeter cloud radar during IOPs. 3. Separation of zenith LOS observations from TIP data When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV and LWP computed and reported separately in the output file. This eliminates the periods of missing LOS data during calibration checks/updates. 4. Automatic self-calibration The software now permits the calibration to be updated at specified intervals or continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified intervals or whenever clear sky conditions occur, the tip data reduced, the calibration updated, and the radiometer returned to LOS mode without operator intervention. In the second case, the radiometer is continuously is TIP mode until changed by the operator. 5. Graphical user display The graphical display is comprised of a status display, a message display, a temperature plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip curves.
Measurements:	twpmwrlosC1.b1: actel tkair IR Brightness Temperature(sky_ir_temp) lon actaz bb31 tnd_nom23 sky23 bbn23 tkxc tnd31 Temperature, brightness, longwave(ir_temp) sky31 tc23 tkbb time_offset Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23) wet_window bbn31 bb23 tnd_nom31 Total liquid water along LOS path(liq) 31.4 GHz sky brightness temperature(tbsky31) tc31 tnd23 lat tknd base_time alt Total water vapor along LOS path(vap)

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DQRID : D060420.9

Start Date	Start Time	End Date	End Time
10/11/1996	0000	03/15/1999	1700

Subject:	TWP/MWR/C1 - software upgrade (version 3.29)
DataStreams:	twpmwrlosC1.b1
Description:	The MWR operating program was upgraded to version 3.29 on 15 March 1999. This version included a beam width correction as well as provided the capability to automatically level the elevation mirror (that is, to automatically detect and correct offsets in the elevation angle stepper motor position.) The improvement in the quality of the tip curves resulting from the auto-leveling has been dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 degrees) have been reduced from +/- 5 K to +/- 0.5 K. In order to take full advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998.
Measurements:	twpmwrlosC1.b1: 31.4 GHz sky brightness temperature(tbsky31) Total liquid water along LOS path(liq) Total water vapor along LOS path(vap) Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)

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DQRID : D061114.2

Start Date	Start Time	End Date	End Time
10/09/2006	1000	01/30/2007	0457

Subject:	TWP/MWR/C1 - Radiometer failure
DataStreams:	twpmwrC1.00, twpmwrlosC1.b1, twpmwrtipC1.a1
Description:	The instrument stopped responding and had to be powered off. Suspect cause of failure is a faulty digital board.
Measurements:	twpmwrC1.00: Raw data stream - documentation not supported twpmwrtipC1.a1: 31bb tnd31 alt 31expave tipsky31 tbskytip31 bbn31 23expave Temperature, brightness, longwave(ir_temp) 23ndiode 31tipsky base_time airm actel 23tipskynd tnd23 31gain actaz r23 31tipbb wet_window 23bbn 23tbzenith 31bbn 31tipskynd tnd31I 31r tnd_nom23 23tipbb tknd tbskytip23 tc23 23bb tkbb1 tkbb2 23gain 23tipsky r31 liqtip bb31 tkxc tc31 tnd_nom31 tkbb tipn vaptip lon tnd23I time_offset tkair bbn23 31ndiode lat bb23 tipsky23 31tbzenith 23r twpmwrlosC1.b1: tkair IR Brightness Temperature(sky_ir_temp) lon actaz bbn23 Temperature, brightness, longwave(ir_temp) tnd31 Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23) wet_window tnd_nom31 Total liquid water along LOS path(liq) tc31 lat tknd alt actel bb31 tnd_nom23 sky23 tkxc sky31 tc23 tkbb time_offset bbn31 bb23 31.4 GHz sky brightness temperature(tbsky31) tnd23 base_time Total water vapor along LOS path(vap)

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DQRID : D070105.1

Start Date	Start Time	End Date	End Time
01/05/2011	2300	01/07/2011	0310
02/25/2011	1300	03/07/2011	0400
03/16/2011	1900	03/31/2011	0100
10/22/2011	2200	10/25/2011	0400
03/24/2013	0000	05/04/2013	0200
02/28/1997	0118	06/27/1997	2048
12/09/1996	2338	12/11/1996	0003
11/06/1997	1959	11/12/1997	1800
01/05/1998	0204	01/08/1998	2048
04/21/1998	0017	04/29/1998	1803
09/13/1998	0759	09/20/1998	0900
11/20/1998	2226	11/27/1998	1026
02/27/1999	0600	03/02/1999	0159
03/06/1999	0800	03/09/1999	1807
09/03/1999	0300	09/10/1999	0400
10/01/1999	0900	10/18/1999	0000
10/20/1999	0500	10/22/1999	0600
01/14/2006	1258	01/16/2006	0638
01/14/2000	0800	01/16/2000	0342

Subject:	TWP/MWR/C1 - Missing data
DataStreams:	twpmwrtipC1.a1, twpmwrlosC1.b1
Description:	Data are missing and unrecoverable.
Measurements:	twpmwrtipC1.a1: 31bb tnd31 alt 31expave tipsky31 23expave bbn31 tbskytip31 23ndiode Temperature, brightness, longwave(ir_temp) 31tipsky base_time airm actel 23tipskynd tnd23 31gain actaz r23 31tipbb wet_window 23bbn 23tbzenith 31bbn 31tipskynd tnd31I 31r tnd_nom23 23tipbb tknd tbskytip23 tc23 23bb tkbb1 tkbb2 23gain 23tipsky r31 liqtip bb31 tkxc tc31 tnd_nom31 tkbb tipn vaptip lon tnd23I time_offset tkair 31ndiode bbn23 lat bb23 tipsky23 31tbzenith 23r twpmwrlosC1.b1: tkair IR Brightness Temperature(sky_ir_temp) lon actaz bbn23 tnd31 Temperature, brightness, longwave(ir_temp) Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23) wet_window tnd_nom31 Total liquid water along LOS path(liq) tc31 lat tknd alt actel bb31 tnd_nom23 sky23 tkxc sky31 tc23 tkbb time_offset bbn31 bb23 31.4 GHz sky brightness temperature(tbsky31) tnd23 base_time Total water vapor along LOS path(vap)

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DQRID : D070412.3

Start Date	Start Time	End Date	End Time
03/07/2007	0000	04/02/2007	2359
03/01/2008	0000	04/02/2008	2359
09/10/2008	0000	10/12/2008	0000
03/01/2009	0000	04/02/2009	2359
09/11/2009	0000	10/10/2009	2359
03/01/2010	0000	04/02/2010	2359
03/01/2011	0000	04/02/2011	2359
09/13/2011	0000	10/09/2011	0000

Subject:	TWP/MWR/C1/C2 - Sun in the field of view
DataStreams:	twpmwrlosC1.b1, twpmwrlosC2.b1, twpmwrtipC1.a1, twpmwrtipC2.a1
Description:	Every day between around noon local time (usually between 1 and 2 AM UTC time) there is an increase in the brightness temperatures due to the sun in the field of view of the radiometer. The effect lasts less than an hour around local noon (usually between 1 and 2 AM UTC time). The effect appears as a smooth increase and decrease in brightness temperature.
Measurements:	twpmwrtipC2.a1: tipsky23 tipsky31 twpmwrtipC1.a1: vaptip liqtip tbskytip23 tbskytip31 twpmwrlosC1.b1: Total liquid water along LOS path(liq) sky23 31.4 GHz sky brightness temperature(tbsky31) sky31 Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23) Total water vapor along LOS path(vap) twpmwrlosC2.b1: sky31 31.4 GHz sky brightness temperature(tbsky31) sky23 Total liquid water along LOS path(liq) Total water vapor along LOS path(vap) Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)

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DQRID : D070613.1

Start Date	Start Time	End Date	End Time
06/12/2007	0700	06/13/2007	2000
06/16/2007	2100	06/17/2007	2100

Subject:	TWP/MWR/C1 - Intermittent data
DataStreams:	twpmwrlosC1.b1, twpmwrtipC1.a1
Description:	After a computer change the MWR program did not restart properly. Data are intermittent between 6/12 and 6/17.
Measurements:	twpmwrtipC1.a1: 31bb tnd31 alt 31expave tipsky31 tbskytip31 bbn31 23expave Temperature, brightness, longwave(ir_temp) 23ndiode 31tipsky base_time airm actel 23tipskynd tnd23 31gain actaz r23 31tipbb wet_window 23bbn 23tbzenith 31bbn 31tipskynd tnd31I 31r tnd_nom23 23tipbb tknd tbskytip23 tc23 23bb tkbb1 tkbb2 23gain 23tipsky r31 liqtip bb31 tkxc tc31 tnd_nom31 tkbb tipn vaptip lon tnd23I time_offset tkair bbn23 31ndiode lat bb23 tipsky23 31tbzenith 23r twpmwrlosC1.b1: tkair IR Brightness Temperature(sky_ir_temp) lon actaz bbn23 Temperature, brightness, longwave(ir_temp) tnd31 Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23) wet_window tnd_nom31 Total liquid water along LOS path(liq) tc31 lat tknd alt actel bb31 tnd_nom23 sky23 tkxc sky31 tc23 tkbb time_offset bbn31 bb23 31.4 GHz sky brightness temperature(tbsky31) tnd23 base_time Total water vapor along LOS path(vap)

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DQRID : D071208.1

Start Date	Start Time	End Date	End Time
11/21/2007	0000	12/11/2007	0355

Subject:	TWP/MWR/C1 - Incorrect ambient temperature readings
DataStreams:	twpmwrlosC1.b1, twpmwrtipC1.a1
Description:	Starting on 11/21 the ambient temperature readings are intermittent and have spikes. Site operators replaced the dew-blower on 12/11 and readings came back to normal
Measurements:	twpmwrtipC1.a1: tkair twpmwrlosC1.b1: tkair

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DQRID : D081013.2

Start Date	Start Time	End Date	End Time
09/01/2008	0000	09/30/2008	2359

Subject:	TWP/MWR/C1 - Short periods of wrong ambient temperature
DataStreams:	twpmwrlosC1.b1, twpmwrtipC1.a1
Description:	During this month there are a few intermittent instances of bad ambient temperature readings. I will summarize here these short time ranges: 20080909 between 02:00 and 03:00 UTC 20080909 between 09:00 and 14:00 UTC Additionally the ambient temperature has short but frequent data gaps. The data gaps are very short (less than one hour). Users could interpolate missing data or use alternative sensors such as the surface meteorological data available for the site.
Measurements:	twpmwrtipC1.a1: tkair twpmwrlosC1.b1: tkair

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DQRID : D090114.4

Start Date	Start Time	End Date	End Time
12/03/2008	1900	02/06/2009	0530

Subject:	TWP/MWR/C1 - Ambient temperature data missing
DataStreams:	twpmwrlosC1.b1, twpmwrtipC1.a1
Description:	The ambient temperature readings (tkair) suddenly failed. The sensor was replaced on Feb 6.
Measurements:	twpmwrtipC1.a1: tkair twpmwrlosC1.b1: tkair

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DQRID : D110221.2

Start Date	Start Time	End Date	End Time
01/07/2011	0311	01/09/2011	0500

Subject:	TWP/MWR/C1 - Intermittent data due to computer problems
DataStreams:	twpmwrtipC1.a1, twpmwrlosC1.b1
Description:	Between 1/7 and 1/9 there are large segments of data missing because of a computer problem.
Measurements:	twpmwrtipC1.a1: 31bb tnd31 alt 31expave tipsky31 bbn31 23expave tbskytip31 Temperature, brightness, longwave(ir_temp) 23ndiode 31tipsky base_time airm actel 23tipskynd tnd23 31gain actaz r23 31tipbb 31bbn 23tbzenith 23bbn wet_window 31tipskynd tnd31I 31r tnd_nom23 23tipbb tknd tbskytip23 tc23 23bb tkbb1 tkbb2 23tipsky 23gain r31 liqtip bb31 tkxc tc31 tnd_nom31 tkbb tipn lon vaptip tnd23I time_offset tkair bbn23 31ndiode lat bb23 tipsky23 31tbzenith 23r twpmwrlosC1.b1: tkair IR Brightness Temperature(sky_ir_temp) lon actaz bbn23 tnd31 Temperature, brightness, longwave(ir_temp) Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23) wet_window tnd_nom31 Total liquid water along LOS path(liq) tc31 lat tknd alt actel bb31 tnd_nom23 sky23 tkxc sky31 tc23 tkbb time_offset bbn31 bb23 31.4 GHz sky brightness temperature(tbsky31) tnd23 base_time Total water vapor along LOS path(vap)

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DQRID : D111214.1

Start Date	Start Time	End Date	End Time
11/09/2011	0000	11/30/2011	2359

Subject:	TWP/MWR/C1 - Rain events not flagged
DataStreams:	twpmwrlosC1.b1, twpmwrtipC1.a1
Description:	On some occasions the rain flag did not flag data during likely rain events. Users should carefully examine the data to ensure that they are not contaminated by rain. Also examine the brightness temperature qc variables.
Measurements:	twpmwrtipC1.a1: liqtip vaptip tbskytip23 tbskytip31 twpmwrlosC1.b1: 31.4 GHz sky brightness temperature(tbsky31) Total liquid water along LOS path(liq) Total water vapor along LOS path(vap) Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)

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DQRID : D120625.1

Start Date	Start Time	End Date	End Time
05/14/2012	0000	06/21/2012	0000

Subject:	TWP/MWR/C1 - Erratic surface temperature readings
DataStreams:	twpmwrlosC1.b1, twpmwrtipC1.a1
Description:	The surface temperature readings were erratic at times between 5/14 and 6/21.
Measurements:	twpmwrtipC1.a1: tkair twpmwrlosC1.b1: tkair

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DQRID : D120917.1

Start Date	Start Time	End Date	End Time
05/15/2012	0000	08/21/2012	0150

Subject:	TWP/MWR/C1 - Spikes in temperature sensor readings
DataStreams:	twpmwrlosC1.b1, twpmwrtipC1.a1
Description:	The air temperature readings had occasional spikes. The temperature sensor was replaced on 8/21.
Measurements:	twpmwrtipC1.a1: tkair twpmwrlosC1.b1: tkair

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END OF DATA