Data Quality Reports for Session: 139671 User: perez Completed: 01/06/2012


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D050406.3PYE/MWR/M1 - tipping anglespyemwrtipM1.a1
D050725.12PYE/MWR/M1 - Reprocessed: Revised Retrieval CoefficientspyemwrlosM1.b1, pyemwrtipM1.a1
D050726.4PYE/MWR/M1 - Reprocessed: Calibration correctedpyemwrlosM1.b1, pyemwrtipM1.a1
D050927.1PYE/MWR/M1 - New software version (4.15) installedpyemwrlosM1.b1, pyemwrtipM1.a1
D060419.4NIM/MWR/M1 - Instrument noise problem/RF interferencenimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1
D060718.1NIM/MWR/M1 - Reprocessed: Recalibration to correct for occasional overheating.nimmwrlosM1.b1, nimmwrtipM1.a1
D080828.1HFE/MWR/M1 - Insufficient calibration stabilityhfemwrlosM1.b1, hfemwrtipM1.a1
D090311.3HFE/MWR/M1 - Missing datahfemwrlosM1.b1, hfemwrtipM1.a1
D090522.1GRW/MWR/M1 - Loose mirrorgrwmwrlosM1.b1, grwmwrtipM1.a1
D100224.6GRW/MWR/M1 - Reprocess: Biased LWP retrievals-Updated retrieval coefficientsgrwmwrlosM1.b1, grwmwrtipM1.a1
D100326.2GRW/MWR/M1 - Incorrect ambient temperaturegrwmwrlosM1.b1, grwmwrtipM1.a1
D100716.1GRW/MWR/M1 - Incorrect instrument computer set-upgrwmwrlosM1.b1, grwmwrtipM1.a1
D100830.1GRW/MWR/M1 - Erratic brightness temperaturegrwmwrlosM1.b1, grwmwrtipM1.a1
D100830.3GRW/MWR/M1 - Missing datagrwmwrlosM1.b1, grwmwrtipM1.a1


DQRID : D050406.3
Start DateStart TimeEnd DateEnd Time
02/01/2005070003/08/20050037
Subject:
PYE/MWR/M1 - tipping angles
DataStreams:pyemwrtipM1.a1
Description:
Obstacles above the horizon were in the field of view of the MWR at the lowest tipping 
elevation angle of 19.5 degrees. The AOS stack to the north and trees to the south affected 
the tip scan measurements at 3 airmasses. This problem was corrected by removing 
observations at the lowest angle from the MWR tip configuration.
Measurements:pyemwrtipM1.a1:
  • tnd_nom23
  • tnd_nom31
  • tc23
  • tbsky31tip
  • vaptip
  • tbsky23tip
  • liqtip
  • tc31


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DQRID : D050725.12
Start DateStart TimeEnd DateEnd Time
02/01/2005070005/06/20050000
Subject:
PYE/MWR/M1 - Reprocessed: Revised Retrieval Coefficients
DataStreams:pyemwrlosM1.b1, pyemwrtipM1.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 water 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).

At Point Reyes, the original coefficients implemented in March 2005 were based on a 
version of the Rosenkranz model that had been modified to use the HITRAN half-width at 22 GHz 
and to be consistent with the water vapor continuum in MONORTM.  These retrievals yielded 
nearly identical results to the MONORTM retrievals.

The MONORTM-based retrieval coefficients became active at PYE.M1 20050506.

Note: The PYE.M1 MWRLOS data for 20050201-20050506 have been reprocessed
to apply the MONORTM-based retrievals for all time. The reprocessed data
were archived in April 2007.  The TIP data have not been reprocessed.
Measurements:pyemwrlosM1.b1:
  • Total liquid water along LOS path(liq)
  • Total water vapor along LOS path(vap)

pyemwrtipM1.a1:
  • vaptip
  • liqtip


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DQRID : D050726.4
Start DateStart TimeEnd DateEnd Time
05/29/2005000007/17/20052100
Subject:
PYE/MWR/M1 - Reprocessed: Calibration corrected
DataStreams:pyemwrlosM1.b1, pyemwrtipM1.a1
Description:
On May 28 1:30 GMT the NFOV radiometer was placed in the field of view of the MWR tip 
calibration. Almost immediately calibration of the MWR was compromised resulting in incorrect 
brightness temperatures and overestimation of both PWV and LWP. 

On July 15 the NFOV radiometer was moved away from the MWR and the instantaneous 
calibration values jumped back to normal. The median values returned to normal on July 17 around 
2100.

The LOS data were reprocessed using interpolated values for the calibration coefficients.  
The reprocessed data are available from the ARM Archive effective December 7, 2005.  
NOTE: the format of the reprocessed data are slightly different than the format of the 
original data and the data available before and after the reprocessed data period.  The 
quality of the data are not affected, just the format.

The MWRTIP data can not be reprocessed and should be used with caution.
Measurements:pyemwrlosM1.b1:
  • tnd23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tc31
  • sky23
  • tnd31
  • Total liquid water along LOS path(liq)
  • tnd_nom31
  • tnd_nom23
  • tc23
  • sky31
  • Total water vapor along LOS path(vap)
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)

pyemwrtipM1.a1:
  • r31
  • tc31
  • tipsky31
  • tc23
  • r23
  • tnd23
  • tnd23I
  • tnd_nom31
  • tnd_nom23
  • tnd31
  • tnd31I
  • vaptip
  • liqtip
  • tipsky23


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DQRID : D050927.1
Start DateStart TimeEnd DateEnd Time
02/01/2005070009/13/20051805
Subject:
PYE/MWR/M1 - New software version (4.15) installed
DataStreams:pyemwrlosM1.b1, pyemwrtipM1.a1
Description:
A problem began with the installation of MWR.EXE version 4.12 in July 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:pyemwrlosM1.b1:
  • tnd23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • bb23
  • IR Brightness Temperature(sky_ir_temp)
  • tkxc
  • tc31
  • sky23
  • bbn31
  • tnd31
  • tknd
  • bb31
  • Total liquid water along LOS path(liq)
  • tnd_nom31
  • tnd_nom23
  • tkbb
  • tc23
  • bbn23
  • sky31
  • Total water vapor along LOS path(vap)
  • tkair
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)

pyemwrtipM1.a1:
  • r31
  • tkxc
  • tbsky23tip
  • tc31
  • bbn31
  • tipsky31
  • tc23
  • tkair
  • bb23
  • tkbb
  • tbsky31tip
  • r23
  • tnd23
  • tnd23I
  • tnd_nom31
  • bb31
  • tnd_nom23
  • tnd31I
  • tnd31
  • bbn23
  • vaptip
  • tknd
  • liqtip
  • tipsky23


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DQRID : D060419.4
Start DateStart TimeEnd DateEnd Time
01/15/2006000001/08/20070000
Subject:
NIM/MWR/M1 - Instrument noise problem/RF interference
DataStreams:nimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1
Description:
Data are affected by intermittent spikes that become more frequent starting in March 2006. 
Spikes affect data mostly around 9 AM and 18:00 PM. The origin of the spikes is probably 
RF interference.
Measurements:nimmwrtipM1.a1:
  • tbsky31tip
  • tipsky31
  • tbsky23tip
  • liqtip
  • vaptip
  • tipsky23

nimmwrM1.00:
  • Raw data stream - documentation not supported

nimmwrlosM1.b1:
  • Total liquid water along LOS path(liq)
  • Total water vapor along LOS path(vap)
  • sky31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • 31.4 GHz sky brightness temperature(tbsky31)
  • sky23


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DQRID : D060718.1
Start DateStart TimeEnd DateEnd Time
03/01/2006000001/08/20070000
Subject:
NIM/MWR/M1 - Reprocessed: Recalibration to correct for occasional overheating.
DataStreams:nimmwrlosM1.b1, nimmwrtipM1.a1
Description:
The radiometer was intermittently thermally unstable resulting in poor calibrations for 
four brief time periods.  These data have been reprocessed to apply corrected calibrations. 
 The affected time periods were:

20060302-20060303
20060423-20060425
20060512-20060515
20060531-20060603
Measurements:nimmwrtipM1.a1:
  • bbn23
  • bb31
  • tc23
  • tnd31
  • r31
  • tnd_nom31
  • tknd
  • tkxc
  • bb23
  • tbsky31tip
  • bbn31
  • tbsky23tip
  • tipsky31
  • tnd_nom23
  • tc31
  • r23
  • tnd23
  • liqtip
  • tkbb
  • vaptip
  • tipsky23

nimmwrlosM1.b1:
  • tkxc
  • bb31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • bbn23
  • sky23
  • tkbb
  • tnd_nom23
  • tnd31
  • tc31
  • Total liquid water along LOS path(liq)
  • Total water vapor along LOS path(vap)
  • tknd
  • bbn31
  • bb23
  • sky31
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tnd_nom31
  • tc23
  • tnd23


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DQRID : D080828.1
Start DateStart TimeEnd DateEnd Time
09/06/2008000009/26/20082359
10/01/2008000010/06/20081500
10/16/2008020110/16/20082359
10/20/2008000010/23/20082359
Subject:
HFE/MWR/M1 - Insufficient calibration stability
DataStreams:hfemwrlosM1.b1, hfemwrtipM1.a1
Description:
The noise diode temperature suddenly jumped to > 60 C after a power outage. Following 
additional power problems the noise diode injection temperature drifted fast and the 
radiometer was not able to calibrate properly.

Data during the indicated time periods are poorly calibrated and sometimes erratic. Users 
should be aware that the accuracy of the measurements is dramatically degraded. 

Users can use the microwave profiler (MWRP) data to supplement the MWR data.
Measurements:hfemwrlosM1.b1:
  • tc23
  • Total water vapor along LOS path(vap)
  • tnd31
  • tc31
  • tknd
  • tnd_nom31
  • tkxc
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Total liquid water along LOS path(liq)
  • tnd23
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • tnd_nom23

hfemwrtipM1.a1:
  • tbsky31tip
  • tc31
  • tnd23
  • tnd_nom23
  • tnd23I
  • tnd31I
  • tc23
  • tbsky23tip
  • tkxc
  • tnd_nom31
  • tknd
  • tnd31
  • liqtip
  • vaptip


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DQRID : D090311.3
Start DateStart TimeEnd DateEnd Time
10/06/2008150110/16/20080200
10/17/2008000010/19/20082359
10/24/2008000010/26/20082359
11/09/2008000012/28/20080000
Subject:
HFE/MWR/M1 - Missing data
DataStreams:hfemwrlosM1.b1, hfemwrtipM1.a1
Description:
Data are missing and unrecoverable.
Measurements:hfemwrlosM1.b1:
  • bb23
  • tnd31
  • time_offset
  • tkxc
  • alt
  • 31.4 GHz sky brightness temperature(tbsky31)
  • bb31
  • tnd23
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • wet_window
  • tnd_nom23
  • tc23
  • tkbb
  • sky23
  • bbn23
  • Total water vapor along LOS path(vap)
  • tc31
  • tknd
  • tkair
  • tnd_nom31
  • bbn31
  • lat
  • Total liquid water along LOS path(liq)
  • base_time
  • lon
  • sky31
  • time
  • IR Brightness Temperature(sky_ir_temp)

hfemwrtipM1.a1:
  • tipsky31
  • bb23
  • base_time
  • tc31
  • tnd31I
  • time_offset
  • lon
  • bb31
  • tipsky23
  • tbsky23tip
  • tc23
  • tkair
  • wet_window
  • tbsky31tip
  • r31
  • tnd23
  • tnd_nom23
  • lat
  • time
  • tnd23I
  • actaz
  • bbn31
  • alt
  • r23
  • tnd_nom31
  • tkxc
  • actel
  • tknd
  • tkbb
  • tnd31
  • liqtip
  • vaptip
  • bbn23


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DQRID : D090522.1
Start DateStart TimeEnd DateEnd Time
05/01/2009000006/16/20090745
Subject:
GRW/MWR/M1 - Loose mirror
DataStreams:grwmwrlosM1.b1, grwmwrtipM1.a1
Description:
The data from the MWR were suspicious and became progressively worse. The problem was 
traced back to the fact that the screw that keeps the mirror in place had become loose and 
the mirror was freely rotating. 

The mirror was tightened on 6/9/2009, however the measurements were noisy until 6/16, when 
the instrument was rebooted and all the connections checked. 

Measurements between 5/1 and 6/9 should not be used. Data between 6/9 and 6/16 are usable, 
although they are very noisy.
Measurements:grwmwrtipM1.a1:
  • vaptip
  • bb31
  • tbsky23tip
  • bbn23
  • bbn31
  • tbsky31tip
  • tipsky23
  • bb23
  • tipsky31
  • liqtip

grwmwrlosM1.b1:
  • sky23
  • bbn23
  • Total water vapor along LOS path(vap)
  • bbn31
  • Total liquid water along LOS path(liq)
  • sky31
  • 31.4 GHz sky brightness temperature(tbsky31)
  • bb31
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • bb23


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DQRID : D100224.6
Start DateStart TimeEnd DateEnd Time
05/01/2009000003/31/20101700
Subject:
GRW/MWR/M1 - Reprocess: Biased LWP retrievals-Updated retrieval coefficients
DataStreams:grwmwrlosM1.b1, grwmwrtipM1.a1
Description:
Retrieval coefficients were updated to screen for some bad soundings
Measurements:grwmwrtipM1.a1:
  • liqtip

grwmwrlosM1.b1:
  • Total liquid water along LOS path(liq)


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DQRID : D100326.2
Start DateStart TimeEnd DateEnd Time
02/09/2010104802/11/20101045
Subject:
GRW/MWR/M1 - Incorrect ambient temperature
DataStreams:grwmwrlosM1.b1, grwmwrtipM1.a1
Description:
The ambient temperature readings are incorrect.  Problem appeared to have started around 
10:48 GMT on 02/09, but was not really noticeable until slightly after 11 GMT, when tkair 
values dipped considerably.  

The dewblower was replaced on 2/11 and temperature readings returned to normal.
Measurements:grwmwrtipM1.a1:
  • tkair

grwmwrlosM1.b1:
  • tkair


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DQRID : D100716.1
Start DateStart TimeEnd DateEnd Time
07/11/2010180008/09/20101400
Subject:
GRW/MWR/M1 - Incorrect instrument computer set-up
DataStreams:grwmwrlosM1.b1, grwmwrtipM1.a1
Description:
Starting late on 07/11 the instrument began to have very brief (< 1 min) data outages 
every few hours.  By 07/12 data had become noticeably incorrect, particularly the PWV, LWP, 
TB23, and TB31.  At ~17 Z on 0713 the missing data / no data available flags became more 
frequent.

The problem was identified as improper settings of the instrument computer and was solved 
on 8/9.
Measurements:grwmwrtipM1.a1:
  • tnd_nom31
  • vaptip
  • tnd31I
  • r23
  • tc23
  • tbsky23tip
  • tnd_nom23
  • tbsky31tip
  • tc31
  • tnd23I
  • r31
  • tnd31
  • tnd23
  • liqtip

grwmwrlosM1.b1:
  • Total water vapor along LOS path(vap)
  • tnd31
  • Total liquid water along LOS path(liq)
  • tnd23
  • tnd_nom31
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tnd_nom23
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • tc23
  • tc31


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DQRID : D100830.1
Start DateStart TimeEnd DateEnd Time
07/20/2010120008/09/20101400
Subject:
GRW/MWR/M1 - Erratic brightness temperature
DataStreams:grwmwrlosM1.b1, grwmwrtipM1.a1
Description:
Around 12 Z on 7/20 both the PWV and 23.8 GHz brightness temp values began to diverge from 
those of the MWRP. By 7/22 both the LWP and 31.4 GHz brightness temp had followed suit. 
At 0600 Z on 7/22 multiple (10-20), brief (<=1 min) data outages began appearing hourly.  
The problem persisted intermittently until 8/9.

On 8/9, changes in the settings of the computer restored the proper functionality of the 
MWR software.
Measurements:grwmwrtipM1.a1:
  • tnd_nom31
  • vaptip
  • tnd31I
  • tc23
  • tbsky23tip
  • tnd_nom23
  • tbsky31tip
  • tc31
  • tnd23I
  • tnd31
  • tnd23
  • liqtip

grwmwrlosM1.b1:
  • Total water vapor along LOS path(vap)
  • tnd31
  • Total liquid water along LOS path(liq)
  • tnd23
  • tnd_nom31
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tnd_nom23
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • tc23
  • tc31


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DQRID : D100830.3
Start DateStart TimeEnd DateEnd Time
07/04/2010160007/06/20101400
Subject:
GRW/MWR/M1 - Missing data
DataStreams:grwmwrlosM1.b1, grwmwrtipM1.a1
Description:
Data are missing and unrecoverable.
Measurements:grwmwrtipM1.a1:
  • vaptip
  • tc23
  • bbn23
  • wet_window
  • tnd_nom23
  • tbsky31tip
  • time
  • tipsky31
  • actel
  • bb31
  • tbsky23tip
  • tc31
  • r31
  • tnd31
  • tipsky23
  • bb23
  • tkbb
  • tkxc
  • time_offset
  • tknd
  • r23
  • actaz
  • base_time
  • tnd23
  • tkair
  • alt
  • lat
  • tnd_nom31
  • tnd31I
  • bbn31
  • tnd23I
  • lon
  • liqtip

grwmwrlosM1.b1:
  • IR Brightness Temperature(sky_ir_temp)
  • tnd31
  • bbn31
  • lon
  • time
  • bb23
  • Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
  • tc23
  • base_time
  • alt
  • tkbb
  • sky31
  • bb31
  • tc31
  • sky23
  • wet_window
  • tknd
  • Total liquid water along LOS path(liq)
  • tnd_nom31
  • tkxc
  • tkair
  • tnd_nom23
  • bbn23
  • Total water vapor along LOS path(vap)
  • tnd23
  • lat
  • 31.4 GHz sky brightness temperature(tbsky31)
  • time_offset


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END OF DATA