Data Quality Reports for Session: 104563 User: payalmehta Completed: 03/01/2007

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060419.3NIM/MWRP/M1 - Instrument noise problemnimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00
D060419.4NIM/MWR/M1 - Instrument noise problem/RF interferencenimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1
D060713.1NIM/MWRP/M1 - 51.25 GHz channel calibration driftednimmwrpM1.b1
D060718.1NIM/MWR/M1 - Radiometer occasionally overheatingnimmwrlosM1.b1, nimmwrtipM1.a1
D061117.1NIM/MWRP/M1 - Reprocessed: K-band calibration drift correctednimmwrpM1.b1


DQRID : D060419.3
Start DateStart TimeEnd DateEnd Time
Subject:
NIM/MWRP/M1 - Instrument noise problem
DataStreams:nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00
Description:
There are spikes and elevated noise in MWRP data. The origine of the spikes is RF 
interference from various sources.  All brightness temperatures are affected, but in particular 
the 5 K-band channels. LWP retrievals are noisy and affected by spikes as a result.
Measurements:nimmwrprawM1.00:
  • Raw data stream - documentation not supported(raw)
nimmwrpM1.b1:
  • Retrieved cloud liquid water content(liquidWaterContent)
  • Derived relative humidity(relativeHumidity)
  • Derived virtual temperature(virtualTemperature)
  • Interpolated water vapor mixing ratio(waterVaporMixingRatio)
  • Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
  • Temperature used to determine the backscatter profile(temperature)
  • Retrieved water vapor density(waterVaporDensity)
  • Interpolated dewpoint temperature(dewpointTemperature)
  • Retrieved liquid water path(liquidWaterPath)
  • Retrieved total precipitable water vapor using only 23.835 and 30.0 GHz(totalPrecipitableWater2)
  • Microwave brightness temperature(brightnessTemperature)
  • Retrieved total precipitable water vapor(totalPrecipitableWater)
nimmwrpM1.00:
  • Raw data stream - documentation not supported(raw)

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DQRID : D060419.4
Start DateStart TimeEnd DateEnd Time
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:nimmwrlosM1.b1:
  • Mean total liquid water amount along LOS path(liq)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Mean total water vapor amount along LOS path(vap)
  • 31.4 GHz sky signal(sky31)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • 23.8 GHz sky signal(sky23)
nimmwrM1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)
nimmwrtipM1.a1:
  • 31.4 GHz sky signal(tipsky31)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • 23.8 GHz sky signal(tipsky23)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)

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DQRID : D060713.1
Start DateStart TimeEnd DateEnd Time
Subject:
NIM/MWRP/M1 - 51.25 GHz channel calibration drifted
DataStreams:nimmwrpM1.b1
Description:
After a power outage on May 5 the 51.25 GHz had a slight change in the calibration. The 
resulting LWP computed by using all 6 channels increased of about 0.025 mm (25 g/m2).
Measurements:nimmwrpM1.b1:
  • Microwave brightness temperature(brightnessTemperature)

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DQRID : D060718.1
Start DateStart TimeEnd DateEnd Time
Subject:
NIM/MWR/M1 - Radiometer occasionally overheating
DataStreams:nimmwrlosM1.b1, nimmwrtipM1.a1
Description:
The radiometer is occasionally thermally unstable. The thermal instability occurs when the 
air temperature exceeds approximately 42.8 degree C (about 316-317 K).
This has been happening since March. The most affected months are
March, May, and June.
Measurements:nimmwrlosM1.b1:
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Mean total water vapor amount along LOS path(vap)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise diode mount temperature(tknd)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • Blackbody kinetic temperature(tkbb)
  • 23.8 GHz sky signal(sky23)
  • Mean total liquid water amount along LOS path(liq)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 31.4 GHz blackbody+noise injection signal(bbn31)
  • 31.4 GHz sky signal(sky31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz Blackbody signal(bb31)
nimmwrtipM1.a1:
  • 31.4 GHz blackbody+noise injection signal(bbn31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.4 GHz Blackbody signal(bb31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • 31.4 GHz sky signal(tipsky31)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 23.8 GHz Blackbody signal(bb23)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • 23.8 GHz sky signal(tipsky23)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Blackbody kinetic temperature(tkbb)
  • Noise diode mount temperature(tknd)

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DQRID : D061117.1
Start DateStart TimeEnd DateEnd Time
10/01/2006000011/17/20061713
Subject:
NIM/MWRP/M1 - Reprocessed: K-band calibration drift corrected
DataStreams:nimmwrpM1.b1
Description:
During October and November there was a drift in the K-Band calibration of the MWRP. This 
resulted in brightness temperatures that were too high.

New calibration coefficients were derived from the median value of the noise diode 
temperature for the months of October and November and the data were reprocessed to apply the 
corrected calibrations.  The reprocessed data were archived in January 2007.
Measurements:nimmwrpM1.b1:
  • Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
  • Retrieved liquid water path(liquidWaterPath)
  • Retrieved total precipitable water vapor using only 23.835 and 30.0 GHz(totalPrecipitableWater2)
  • Microwave brightness temperature(brightnessTemperature)
  • Retrieved cloud liquid water content(liquidWaterContent)
  • Retrieved total precipitable water vapor(totalPrecipitableWater)

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