Data Quality Reports for Session: 113190 User: ywang699 Completed: 07/16/2008


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D050310.3TWP/MWR/C2 - Heater problemtwp5mwravgC2.c1, twpmwrlosC2.b1, twpmwrtipC2.a1
D050725.10TWP/MWR/C2 - Reprocessed: Revised Retrieval Coefficientstwp5mwravgC2.c1, twpmwrlosC2.b1, twpqmemwrcolC2.c1
D050725.9TWP/MWR/C1 - Reprocessed: Revised Retrieval Coefficientstwp5mwravgC1.c1, twpmwrlosC1.b1, twpmwrtipC1.a1
D061002.1TWP/MWR/C2 - Missing datatwp5mwravgC2.c1, twpmwrC2.00, twpmwrlosC2.b1, twpmwrtipC2.a1


DQRID : D050310.3
Start DateStart TimeEnd DateEnd Time
02/04/2005234003/14/20051650
Subject:
TWP/MWR/C2 - Heater problem
DataStreams:twp5mwravgC2.c1, twpmwrlosC2.b1, twpmwrtipC2.a1
Description:
When the wiring of the air temperature sensor was checked the heater apparently began 
activating too often.
Measurements:twpmwrlosC2.b1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)

twp5mwravgC2.c1:
  • Fraction of data in averaging interval with water on Teflon window(water_flag_fraction)

twpmwrtipC2.a1:
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)


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DQRID : D050725.10
Start DateStart TimeEnd DateEnd Time
04/27/2002060006/30/20052100
Subject:
TWP/MWR/C2 - Reprocessed: Revised Retrieval Coefficients
DataStreams:twp5mwravgC2.c1, twpmwrlosC2.b1, twpqmemwrcolC2.c1
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.C2 20020427.0600.  The 
MONORTM-based retrieval coefficients became active at TWP.C2 20050630.2100.

Note: The TWP.C2 data for 19981028-20050630 have been reprocessed to apply the 
MONORTM-based retrievals for all time.  The reprocessed data were archived 20061003.
Measurements:twpmwrlosC2.b1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

twpqmemwrcolC2.c1:
  • Ensemble average for MWR liquid in window centered about balloon release(mean_liq_mwr)
  • Ensemble average for MWR vapor in window centered about balloon release(mean_vap_mwr)

twp5mwravgC2.c1:
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)


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DQRID : D050725.9
Start DateStart TimeEnd DateEnd Time
05/04/2002020006/30/20052100
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:twpmwrlosC1.b1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

twp5mwravgC1.c1:
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)

twpmwrtipC1.a1:
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)


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DQRID : D061002.1
Start DateStart TimeEnd DateEnd Time
09/14/2006150011/27/20061900
Subject:
TWP/MWR/C2 - Missing data
DataStreams:twp5mwravgC2.c1, twpmwrC2.00, twpmwrlosC2.b1, twpmwrtipC2.a1
Description:
The heater blower assembly was causing the fuse to blow.  The instrument was taken offline 
until a replacement arrives.
Measurements:twpmwrlosC2.b1:
  • 31.4 GHz sky signal(sky31)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Mixer kinetic (physical) temperature(tkxc)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Blackbody kinetic temperature(tkbb)
  • lat(lat)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • 31.4 GHz blackbody(bb31)
  • MWR column precipitable water vapor(vap)
  • 23.8 GHz sky signal(sky23)
  • Ambient temperature(tkair)
  • IR Brightness Temperature(ir_temp)
  • base time(base_time)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • lon(lon)
  • 23.8 GHz Blackbody signal(bb23)
  • (tknd)
  • Actual Azimuth(actaz)
  • Time offset of tweaks from base_time(time_offset)
  • Actual elevation angle(actel)
  • Dummy altitude for Zeb(alt)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Temperature correction coefficient at 31.4 GHz(tc31)

twpmwrC2.00:
  • null(Raw data stream - documentation not supported)

twp5mwravgC2.c1:
  • lat(lat)
  • Standard deviation about the mean for the total water vapor amount(vap_sdev)
  • lon(lon)
  • Fraction of data in averaging interval with water on Teflon window(water_flag_fraction)
  • Averaged total liquid water along LOS path(liq)
  • Standard deviation about the mean for the 31.4 GHz sky brightness temperature(tbsky31_sdev)
  • IR Brightness Temperature(ir_temp)
  • Time offset of tweaks from base_time(time_offset)
  • Number of data points averaged for 23tbsky, 31tbsky, vap & liq(num_obs)
  • Standard deviation about the mean for the 23.8 GHz sky brightness temperature(tbsky23_sdev)
  • Dummy altitude for Zeb(alt)
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Number of points included in the ir_temp ensemble(num_obs_irt)
  • base time(base_time)
  • Standard deviation about the mean for the IR brightness temperature(ir_temp_sdev)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • MWR column precipitable water vapor(vap)
  • Standard deviation about the mean for the total liquid water amount(liq_sdev)

twpmwrtipC2.a1:
  • 31.4 GHz sky signal(tipsky31)
  • lat(lat)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • Actual Azimuth(actaz)
  • 23.8 GHz sky signal(tipsky23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • 31.4 GHz blackbody(bb31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Ambient temperature(tkair)
  • Dummy altitude for Zeb(alt)
  • (tknd)
  • base time(base_time)
  • Blackbody kinetic temperature(tkbb)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • Time offset of tweaks from base_time(time_offset)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Actual elevation angle(actel)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • lon(lon)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Mixer kinetic (physical) temperature(tkxc)


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END OF DATA