Data Quality Reports for Session: 101236 User: chollow Completed: 08/22/2006


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D030528.2TWP/MWR/C2 - Power outage in I-Van resulted in Missing DatatwpmwrC2.00, twpmwrlosC2.a1, twpmwrlosC2.b1, twpmwrtipC2.a1, twp5mwravgC2.c1,
twpqmemwrcolC2.c1
D050310.3TWP/MWR/C2 - Heater problemtwpmwrlosC2.b1, twpmwrtipC2.a1, twp5mwravgC2.c1
D050725.10TWP/MWR/C2 - Reprocess: Revised Retrieval CoefficientstwpmwrlosC2.a1, twpmwrlosC2.b1, twp5mwravgC2.c1, twpqmemwrcolC2.c1


DQRID : D030528.2
Start DateStart TimeEnd DateEnd Time
05/24/2003230005/25/20030010
Subject:
TWP/MWR/C2 - Power outage in I-Van resulted in Missing Data
DataStreams:twpmwrC2.00, twpmwrlosC2.a1, twpmwrlosC2.b1, twpmwrtipC2.a1, twp5mwravgC2.c1,
twpqmemwrcolC2.c1
Description:
I forgot to put in the daily report that we took the I van down yesterday to replace the 
fans
in the Clary UPS. This was from 2300z on 24May03 to 0010z on 25May03. Instruments affected 
:

MPL
Ceilometer
MWR
WSI
TSI

Rex
Measurements:twpmwrlosC2.b1:
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 31.4 GHz Blackbody signal(bb31)
  • 23.8 GHz sky signal(sky23)
  • Mean IR brightness temperature(ir_temp)
  • 31.4 GHz blackbody+noise injection signal(bbn31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • altitude above sea levelaltunits(alt)
  • Sky/Cloud Infra-Red Temperature(sky_ir_temp)
  • 31.4 GHz sky signal(sky31)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Blackbody kinetic temperature(tkbb)
  • north latitude for all the input platforms.(lat)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Mean total water vapor amount along LOS path(vap)
  • Ambient temperature(tkair)
  • Time offset from base_time(base_time)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Mean total liquid water amount along LOS path(liq)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • east longitude for all the input platforms.(lon)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise diode mount temperature(tknd)
  • Actual Azimuth(actaz)
  • Time offset of tweaks from base_time(time_offset)
  • Actual elevation angle(actel)
  • Temperature correction coefficient at 31.4 GHz(tc31)

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

twpmwrlosC2.a1:
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 23.8 GHz sky signal(sky23)
  • 23.8 GHz noise injection brightness temperature(unoise23)
  • Mean total liquid water amount along LOS path(liq)
  • Actual elevation angle(actel)
  • east longitude for all the input platforms.(lon)
  • 23.8 GHz sky plus noise injection signal(skyn23)
  • altitude above sea levelaltunits(alt)
  • Noise diode mount temperature(tknd)
  • Actual Azimuth(actaz)
  • 31.4 GHz blackbody+noise injection signal(bbn31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Mean IR brightness temperature(ir_temp)
  • Mean total water vapor amount along LOS path(vap)
  • 31.4 GHz Blackbody signal(bb31)
  • Blackbody kinetic temperature(tkbb)
  • 31.4 GHz sky+noise injection signal(skyn31)
  • Sky/Cloud Infra-Red Temperature(sky_ir_temp)
  • Time offset of tweaks from base_time(time_offset)
  • 31.4 GHz noise injection brightness temperature(unoise31)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • Which LOS configuration(losn)
  • 31.4 GHz sky signal(sky31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Time offset from base_time(base_time)
  • Ambient temperature(tkair)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • north latitude for all the input platforms.(lat)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Temperature correction coefficient at 31.4 GHz(tc31)

twpqmemwrcolC2.c1:
  • Standard deviation of ensemble average for MWR ir_temp(sdev_ir_temp_mwr)
  • Serial number for the sonde used at this time.(sonde_serial_number)
  • Ensemble average for MWR vapor in window centered about balloon release(mean_vap_mwr)
  • MWR IPM output for 23.8 GHz sky brightness temperature using sonde T,P,RH(model_tbsky23)
  • Status of the Instrument Performance Model results(model_status_flag)
  • Time offset from base_time(base_time)
  • Integrated vapor column from sonde using a direct calculation (external from the
    IPM)(integ_vap_sonde_direct)
  • Number of cloudy observations in BLC cloud1 ensemble(num_cloud1_cloudy)
  • Ensemble average of first cloud base height from Belfort ceilometer in 40 minute
    window centered upon balloon release (clear observations are excluded)(mean_cloud1)
  • east longitude for all the input platforms.(lon)
  • Number of clear observations in BLC cloud1 ensemble (not used in ensemble
    average)(num_cloud1_clear)
  • Standard deviation of ensemble average of first cloud base height from the
    Belfort ceilometer(sdev_cloud1)
  • Ensemble average for MWR IR Brightness Temperature in window centered about
    balloon release(mean_ir_temp_mwr)
  • Size of MWR ensemble for mean_tbsky31_mwr field(num_tbsky31_mwr)
  • MWR IPM output for atmospheric mean radiating temp using sonde T,P,RH(model_tmr31)
  • Standard deviation of ensemble average for MWR vapor(sd_vap_mwr)
  • Time offset of tweaks from base_time(time_offset)
  • Size of MWR ensemble for mean_vap_mwr field(num_vap_mwr)
  • Standard deviation for ensemble average for MWR 31.4 GHz sky brightness
    temperature(sd_tbsky31_mwr)
  • Size of MWR ensemble for mean_liq_mwr field(num_liq_mwr)
  • ensemble average for MWR 23.8 GHz sky brightness temperature in window centered
    about balloon release(mean_tbsky23_mwr)
  • north latitude for all the input platforms.(lat)
  • Ensemble average for MWR liquid in window centered about balloon release(mean_liq_mwr)
  • (model_tbsky31 - mean_tbsky31)/sd_tbsky31_mwr(sdev_tbsky31_away)
  • ensemble average for MWR 31.4 GHz sky brightness temperature in window centered
    about balloon release(mean_tbsky31_mwr)
  • Size of MWR ensemble for mean_tbsky23_mwr field(num_tbsky23_mwr)
  • Standard deviation for ensemble average for MWR liq(sd_liq_mwr)
  • MWR IPM output for 31.4 GHz sky brightness temperature using sonde T,P,RH(model_tbsky31)
  • (integ_vap_sonde - mean_vap_mwr) /sd_vap_mwr(sdev_vap_away)
  • maximum height attained by the balloon in pressure units(max_height_sonde)
  • altitude above sea levelaltunits(alt)
  • Integrated vapor column from sonde using MWR Instrument Performance Model (IPM)(integ_vap_sonde)
  • denotes whether mean_liq_mwr was above LIQ_WATER_THRESHOLD or whether MWR IPM
    used the cloud model(likely_clouds)
  • Standard deviation for ensemble average for MWR 23.8 GHz sky brightness
    temperature(sd_tbsky23_mwr)
  • Size of MWR ensemble for mean_ir_temp_mwr field(num_ir_temp_mwr)
  • (model_tbsky23 - mean_tbsky23_mwr)/sd_tbsky23_mwr(sdev_tbsky23_away)
  • MWR IPM output for atmospheric mean radiating temp using sonde T,P,RH(model_tmr23)

twp5mwravgC2.c1:
  • Standard deviation about the mean for the total water vapor amount(vap_sdev)
  • Fraction of data in averaging interval with water on the Teflon window(water_flag_fraction)
  • altitude above sea levelaltunits(alt)
  • Number of points included in the ir_temp ensemble(num_obs_irt)
  • north latitude for all the input platforms.(lat)
  • east longitude for all the input platforms.(lon)
  • Mean total liquid water amount along LOS path(liq)
  • Standard deviation about the mean for the 31.4 GHz sky brightness temperature(tbsky31_sdev)
  • Mean IR brightness temperature(ir_temp)
  • Time offset of tweaks from base_time(time_offset)
  • Number of points included in the ensemble of all the fields except the ir_temp
    fields(num_obs)
  • Standard deviation about the mean for the 23.8 GHz sky brightness temperature(tbsky23_sdev)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • Time offset from base_time(base_time)
  • Standard deviation about the mean for the IR brightness temperature(ir_temp_sdev)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Mean total water vapor amount along LOS path(vap)
  • Standard deviation about the mean for the total liquid water amount(liq_sdev)

twpmwrtipC2.a1:
  • 31.4 GHz sky signal(tipsky31)
  • north latitude for all the input platforms.(lat)
  • 31.4 GHz blackbody+noise injection signal(bbn31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • altitude above sea levelaltunits(alt)
  • Noise diode mount temperature(tknd)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Time offset of tweaks from base_time(time_offset)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • 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 Blackbody signal(bb31)
  • Ambient temperature(tkair)
  • Time offset from base_time(base_time)
  • Blackbody kinetic temperature(tkbb)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • Actual elevation angle(actel)
  • 23.8 GHz Blackbody signal(bb23)
  • east longitude for all the input platforms.(lon)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Mixer kinetic (physical) temperature(tkxc)
  • Temperature correction coefficient at 31.4 GHz(tc31)


Back To Table of Contents

DQRID : D050310.3
Start DateStart TimeEnd DateEnd Time
02/04/2005234003/14/20051650
Subject:
TWP/MWR/C2 - Heater problem
DataStreams:twpmwrlosC2.b1, twpmwrtipC2.a1, twp5mwravgC2.c1
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 the Teflon window(water_flag_fraction)

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


Back To Table of Contents

DQRID : D050725.10
Start DateStart TimeEnd DateEnd Time
04/27/2002060006/30/20052100
Subject:
TWP/MWR/C2 - Reprocess: Revised Retrieval Coefficients
DataStreams:twpmwrlosC2.a1, twpmwrlosC2.b1, twp5mwravgC2.c1, 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).

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 TWP.C2 
20020427.0600.  The MONORTM-based retrieval coefficients became active 
at TWP.C2 20050630.2100.

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:twpmwrlosC2.b1:
  • Mean total water vapor amount along LOS path(vap)
  • Mean total liquid water amount along LOS path(liq)

twpmwrlosC2.a1:
  • Mean total liquid water amount along LOS path(liq)
  • Mean total water vapor amount along LOS path(vap)

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:
  • Mean total liquid water amount along LOS path(liq)
  • Mean total water vapor amount along LOS path(vap)


Back To Table of Contents



END OF DATA