Data Quality Reports for Session: 133702 User: hannes1die Completed: 03/08/2011


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D020805.2SGP/MWR/B6 - Instrument replaced, calibration incorrectsgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosB6.b1, sgp5mwravgB6.c1
D020805.3SGP/MWR/B6 - Instrument replaced, calibration updatingsgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosB6.b1, sgp5mwravgB6.c1
D050725.5SGP/MWR/B6 - Reprocess: Revised Retrieval CoefficientssgpmwrlosB6.a1, sgpmwrlosB6.b1, sgpmwrtipB6.a1, sgp5mwravgB6.c1, sgpqmemwrcolB6.c1


DQRID : D020805.2
Start DateStart TimeEnd DateEnd Time
08/02/2002165208/02/20022144
Subject:
SGP/MWR/B6 - Instrument replaced, calibration incorrect
DataStreams:sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosB6.b1, sgp5mwravgB6.c1
Description:
MWR serial number 18 was replaced with MWR serial number 04 at 1652 on 2 Aug 2002.  
Between this time and 2214, when a sufficient number of new tip curves were acquired to update 
the calibration, the old calibration (for serial number 18) was used.  During this period 
the data are incorrect.
Measurements:sgpmwrlosB6.a1:
  • tkbb
  • bbn31
  • bb23
  • wet_window
  • 23tbsky
  • Total water vapor along LOS path(vap)
  • bb31
  • tnd23
  • actel
  • Temperature, brightness, longwave(ir_temp)
  • Total liquid water along LOS path(liq)
  • lat
  • tkxc
  • bbn23
  • tnd31
  • sky31
  • lon
  • tkair
  • tc23
  • alt
  • sky23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • 23.8 GHz sky brightness temperature(tbsky23)
  • actaz
  • Temperature, Sky Infra-Red(sky_ir_temp)
  • tc31
  • tknd
  • time_offset
  • tnd_nom31
  • base_time
  • tnd_nom23
  • 31tbsky

sgpmwrlosB6.b1:
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Temperature, Sky Infra-Red(sky_ir_temp)
  • tc31
  • bbn31
  • lat
  • 23.8 GHz sky brightness temperature(tbsky23)
  • bbn23
  • alt
  • tnd31
  • tkxc
  • Total liquid water along LOS path(liq)
  • tknd
  • tkair
  • tnd23
  • bb31
  • Total water vapor along LOS path(vap)
  • tnd_nom23
  • time_offset
  • tnd_nom31
  • bb23
  • lon
  • tkbb
  • Temperature, brightness, longwave(ir_temp)
  • tc23
  • sky31
  • wet_window
  • base_time
  • sky23

sgpmwrlosB6.a0:
  • actel
  • 23skyn
  • bbn23
  • 23unoise
  • 31bbn
  • sky23
  • tnd23
  • 31bb
  • 23.8 GHz sky brightness temperature(tbsky23)
  • time_offset
  • 23sky
  • 23bbn
  • bb23
  • tnd31
  • alt
  • tkbb
  • losn
  • lon
  • 23tbsky
  • bbn31
  • bb31
  • Total water vapor along LOS path(vap)
  • 23bb
  • temperature_correction_coef_31
  • noise_injection_temp_31
  • actaz
  • Total liquid water along LOS path(liq)
  • lat
  • tkxc
  • 31unoise
  • base_time
  • wet_window
  • 31sky
  • noise_injection_temp_23
  • temperature_correction_coef_23
  • tkair
  • sky31
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tknd
  • 31tbsky
  • Temperature, brightness, longwave(ir_temp)
  • 31skyn

sgp5mwravgB6.c1:
  • 31.4 GHz sky brightness temperature(tbsky31)
  • vap_sdev
  • time_offset
  • tbsky31_sdev
  • 23.8 GHz sky brightness temperature(tbsky23)
  • base_time
  • tbsky23_sdev
  • num_obs
  • Total water vapor along LOS path(vap)
  • dlm_flag_periods
  • 31tbsky
  • alt
  • lat
  • num_obs_ir
  • 23tbsky
  • Total liquid water along LOS path(liq)
  • ir_temp_sdev
  • water_flag_fraction
  • water_flag_periods
  • liq_sdev
  • num_obs_irt
  • dlm_flag_fraction
  • Temperature, brightness, longwave(ir_temp)
  • lon


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DQRID : D020805.3
Start DateStart TimeEnd DateEnd Time
08/02/2002214408/04/20020213
Subject:
SGP/MWR/B6 - Instrument replaced, calibration updating
DataStreams:sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosB6.b1, sgp5mwravgB6.c1
Description:
Following replacement of the MWR at B6, an automatically and continuously upated median 
calibration value was used based on data acquired during this period.  After this period, 
sufficient tip curves were available to automatically and continuously determine and 
account for the temperature dependence of the calibration.
Measurements:sgpmwrlosB6.a1:
  • tkbb
  • bbn31
  • bb23
  • wet_window
  • 23tbsky
  • Total water vapor along LOS path(vap)
  • bb31
  • tnd23
  • actel
  • Temperature, brightness, longwave(ir_temp)
  • Total liquid water along LOS path(liq)
  • lat
  • tkxc
  • bbn23
  • tnd31
  • sky31
  • lon
  • tkair
  • tc23
  • alt
  • sky23
  • 31.4 GHz sky brightness temperature(tbsky31)
  • 23.8 GHz sky brightness temperature(tbsky23)
  • actaz
  • Temperature, Sky Infra-Red(sky_ir_temp)
  • tc31
  • tknd
  • time_offset
  • tnd_nom31
  • base_time
  • tnd_nom23
  • 31tbsky

sgpmwrlosB6.b1:
  • 31.4 GHz sky brightness temperature(tbsky31)
  • Temperature, Sky Infra-Red(sky_ir_temp)
  • tc31
  • bbn31
  • lat
  • 23.8 GHz sky brightness temperature(tbsky23)
  • bbn23
  • alt
  • tnd31
  • tkxc
  • Total liquid water along LOS path(liq)
  • tknd
  • tkair
  • tnd23
  • bb31
  • Total water vapor along LOS path(vap)
  • tnd_nom23
  • time_offset
  • tnd_nom31
  • bb23
  • lon
  • tkbb
  • Temperature, brightness, longwave(ir_temp)
  • tc23
  • sky31
  • wet_window
  • base_time
  • sky23

sgpmwrlosB6.a0:
  • actel
  • 23skyn
  • bbn23
  • 23unoise
  • 31bbn
  • sky23
  • tnd23
  • 31bb
  • 23.8 GHz sky brightness temperature(tbsky23)
  • time_offset
  • 23sky
  • 23bbn
  • bb23
  • tnd31
  • alt
  • tkbb
  • losn
  • lon
  • 23tbsky
  • bbn31
  • bb31
  • Total water vapor along LOS path(vap)
  • 23bb
  • temperature_correction_coef_31
  • noise_injection_temp_31
  • actaz
  • Total liquid water along LOS path(liq)
  • lat
  • tkxc
  • 31unoise
  • base_time
  • wet_window
  • 31sky
  • noise_injection_temp_23
  • temperature_correction_coef_23
  • tkair
  • sky31
  • 31.4 GHz sky brightness temperature(tbsky31)
  • tknd
  • 31tbsky
  • Temperature, brightness, longwave(ir_temp)
  • 31skyn

sgp5mwravgB6.c1:
  • 31.4 GHz sky brightness temperature(tbsky31)
  • vap_sdev
  • time_offset
  • tbsky31_sdev
  • 23.8 GHz sky brightness temperature(tbsky23)
  • base_time
  • tbsky23_sdev
  • num_obs
  • Total water vapor along LOS path(vap)
  • dlm_flag_periods
  • 31tbsky
  • alt
  • lat
  • num_obs_ir
  • 23tbsky
  • Total liquid water along LOS path(liq)
  • ir_temp_sdev
  • water_flag_fraction
  • water_flag_periods
  • liq_sdev
  • num_obs_irt
  • dlm_flag_fraction
  • Temperature, brightness, longwave(ir_temp)
  • lon


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DQRID : D050725.5
Start DateStart TimeEnd DateEnd Time
04/16/2002220006/24/20051942
Subject:
SGP/MWR/B6 - Reprocess: Revised Retrieval Coefficients
DataStreams:sgpmwrlosB6.a1, sgpmwrlosB6.b1, sgpmwrtipB6.a1, sgp5mwravgB6.c1, sgpqmemwrcolB6.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).

Although the MWR data will be reprocessed to apply the new monortm-based 
retrievals, for most purposes it will be sufficient to correct the data 
using the following factors:

PWV_MONORTM = 0.9695 * PWV_ROSENKRANZ
LWP_MONORTM = 1.026  * LWP_ROSENKRANZ

The Rosenkranz-based retrieval coefficients became active at SGP.B6 
20020416.2200.  The MONORTM-based retrieval coefficients became active 
at SGP.B6 20050624.1942.

Note: a reprocessing effort is already underway to apply the 
Rosenkranz-based retrieval coefficients to all MWR prior to April 
2002.  An additional reprocessing task will be undertaken to apply 
the MONORTM retrieval to all MWR data when the first is completed. 
Read reprocessing comments in the netcdf file header carefully to 
ensure you are aware which retrieval is in play.
Measurements:sgpmwrlosB6.a1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)

sgpmwrlosB6.b1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)

sgpmwrtipB6.a1:
  • vaptip
  • liqtip

sgp5mwravgB6.c1:
  • Total water vapor along LOS path(vap)
  • Total liquid water along LOS path(liq)

sgpqmemwrcolB6.c1:
  • mean_vap_mwr
  • mean_liq_mwr


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