Data Quality Reports for Session: 184676 User: akinolao1 Completed: 03/29/2017


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected Data Quality Metric
D060307.1NIM/MWRP/M1 - Software problemnimmwrpM1.b1Missing
D060419.3NIM/MWRP/M1 - Instrument noise problemnimmwrpM1.b1Suspect
D060420.5NIM/MWRP/M1 - IRT Sensor CalibrationnimmwrpM1.b1Suspect
D060602.2NIM/MWRP/M1 - Reprocessed: IRT configuration setting errornimmwrpM1.b1Does not affect quality
D060619.1NIM/MWRP/M1 - Reprocessed - New retrieval coefficientsnimmwrpM1.b1Does not affect quality
D060713.1NIM/MWRP/M1 - 51.25 GHz channel calibration driftednimmwrpM1.b1Incorrect
D060929.1NIM/MWRP/M1 - Sun in radiometer's field of viewnimmwrpM1.b1Suspect
D061003.3NIM/MWRP/M1 - IRTs do not agree with AERInimmwrpM1.b1Suspect
D061117.1NIM/MWRP/M1 - Reprocessed: K-band calibration drift correctednimmwrpM1.b1Does not affect quality


DQRID : D060307.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
02/28/2006110003/07/20061615Missing
Subject:
NIM/MWRP/M1 - Software problem
DataStreams:nimmwrpM1.b1
Description:
The MWRP computer failed and it was cloned with a new Gx620. Soon after, the MWRP program 
started to crash and was intermittent. Data were lost on March 3, 4, 5. 
On March 7 the program was forcefully ended and restarted. This appears to have cleared 
the problem. The instrument has been running since.
Measurements:nimmwrpM1.b1:
  • Pressure, lifting condensation level(liftingCondensationLevelPres)
  • time_offset
  • liquidWaterPath2RmsError
  • frequency
  • Pressure, barometric. at instrument height (1 or 2 m)(surfacePressure)
  • elevation
  • Liquid water path, from Tbright at 23.835 and 30.0 GHz only, using stat. retrvl.(liquidWaterPath2)
  • wetWindowFlag
  • liquidWaterContentRmsError
  • Pressure, level of free convection(levelFreeConvectionPres)
  • surface pressure(pressure)
  • Temperature, dew point, vert. prof. sfc-10km, from water vapor density prof.(dewpointTemperature)
  • totalPrecipitableWaterRmsError
  • Pressure, equilibrium level(equilibriumLevelPres)
  • Height, lifting condensation level(liftingCondensationLevel)
  • infraredTemperature
  • Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
  • CAPE, Convective available potential energy(cape)
  • Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
  • Height, cloud base, height where IR temp. matches retrieved temp. profile(cloudBaseHeight)
  • Density, water vapor, at instrument height (1 or 2 m)(surfaceWaterVaporDensity)
  • dataQualityFlags
  • Mixing ratio, water vap., vert. prof. sfc-10km, frm retr. water vap. dens. prof(waterVaporMixingRatio)
  • Height, level of free convection(levelFreeConvection)
  • base_time
  • Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
  • Pressure, associated geometric height, at altitude, NGM model output(height)
  • liquidWaterPathRmsError
  • Temperature, air, at instrument height (1 or 2 m)(surfaceTemperature)
  • waterVaporDensityRmsError
  • temperatureRmsError
  • totalPrecipitableWater2RmsError
  • Humidity, relative, at instrument height (1 or 2 m)(surfaceRelativeHumidity)
  • Altitude above mean sea level(alt)
  • Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity)
  • azimuth
  • Microwave brightness temperature(brightnessTemperature)
  • Humidity, relative, prof. from sfc.-10km, from water vap. dens. and temp. prof.(relativeHumidity)
  • time
  • East longitude(lon)
  • Liquid water content, cloud, vert. prof. sfc.-10km, from Tbright stat. retrvl.(liquidWaterContent)
  • Height, equilibrium level(equilibriumLevel)
  • North latitude(lat)
  • blackbodyTemperature
  • Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)
  • MET air temperature(temperature)


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DQRID : D060419.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/01/2006000001/08/20070000Suspect
Subject:
NIM/MWRP/M1 - Instrument noise problem
DataStreams:nimmwrpM1.b1
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:nimmwrpM1.b1:
  • Microwave brightness temperature(brightnessTemperature)
  • Temperature, dew point, vert. prof. sfc-10km, from water vapor density prof.(dewpointTemperature)
  • Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
  • Humidity, relative, prof. from sfc.-10km, from water vap. dens. and temp. prof.(relativeHumidity)
  • Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
  • Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
  • Liquid water content, cloud, vert. prof. sfc.-10km, from Tbright stat. retrvl.(liquidWaterContent)
  • Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity)
  • Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)
  • Liquid water path, from Tbright at 23.835 and 30.0 GHz only, using stat. retrvl.(liquidWaterPath2)
  • MET air temperature(temperature)
  • Mixing ratio, water vap., vert. prof. sfc-10km, frm retr. water vap. dens. prof(waterVaporMixingRatio)


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DQRID : D060420.5
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/15/2006000006/03/20060000Suspect
Subject:
NIM/MWRP/M1 - IRT Sensor Calibration
DataStreams:nimmwrpM1.b1
Description:
Discrepancies between the MWRP and Skyrad IRT were observed in January. The MWRP IRT 
readings were constantly higher than those of the skyrad IRT. Some changes were introduced to 
the MWRP IRT to address the problem (see DQR D060602.2). On May 3, the IRT mirror was 
replaced. After the change in the mirror, the MWRP IRT readings became about 5-8 C lower. On 
June 3 the agreement between MWRP and Skyrad IRT became satisfactory (2-5 degree C 
difference).

It is hard to numerically quantify the difference in the IRT readings caused by the change 
in the mirror. We can only warn the user that between January 1 and June 3 the MWRP 
readings are 8 to 15 degree higher than the skyrad IRT.
Measurements:nimmwrpM1.b1:
  • infraredTemperature


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DQRID : D060602.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/15/2006000004/21/20060000Does not affect quality
Subject:
NIM/MWRP/M1 - Reprocessed: IRT configuration setting error
DataStreams:nimmwrpM1.b1
Description:
The infrared thermometer settings (IRT) were not configured as specified by the 
manufacturer. The analog output was set to a range of -60 to +50 C (0-10V) instead of -50 to +50 C 
(0-10V). The settings were changed on April 20. The IR temperatures should be slightly 
smaller than reported.

The data have been reprocessed to correct the IRT calibrations.  Reprocessed data were 
archived in August 2006.
Measurements:nimmwrpM1.b1:
  • infraredTemperature


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DQRID : D060619.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/01/2006000008/24/20062300Does not affect quality
Subject:
NIM/MWRP/M1 - Reprocessed - New retrieval coefficients
DataStreams:nimmwrpM1.b1
Description:
Occasionally, the retrieved relative humidity was exceeding 120%. Upon reviewing the data 
it was noticed that the high values were appearing in the highest layers (above 8 km) and 
especially during spring season. Since retrievals at the highest levels are mainly 
affected by the climatology used to constrain the retrievals, we reviewed the statistical 
coefficients that were used to retrieve temperature and humidity. It was discovered that, in 
the training dataset (radiosonde), there were a few outliers (invalid radiosonde 
soundings) that had escaped the screening process and were affecting the computations of the 
retrieval coefficients.

We recomputed the retrieval coefficients with the newly screened set of radiosonde data 
and reprocessed all the previous data at Niamey.  The reprocessed data were archived in 
August 2006.

The new coefficients improve temperature and humidity profiles in two ways. The relative 
humidity will not exceed 120% in the upper layers and the temperature profiles will be in 
better agreement with the sonde in the first 4 km.
Measurements:nimmwrpM1.b1:
  • Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
  • liquidWaterPathRmsError
  • liquidWaterPath2RmsError
  • waterVaporDensityRmsError
  • totalPrecipitableWater2RmsError
  • temperatureRmsError
  • Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity)
  • Liquid water path, from Tbright at 23.835 and 30.0 GHz only, using stat. retrvl.(liquidWaterPath2)
  • liquidWaterContentRmsError
  • Temperature, dew point, vert. prof. sfc-10km, from water vapor density prof.(dewpointTemperature)
  • totalPrecipitableWaterRmsError
  • Humidity, relative, prof. from sfc.-10km, from water vap. dens. and temp. prof.(relativeHumidity)
  • Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
  • Liquid water content, cloud, vert. prof. sfc.-10km, from Tbright stat. retrvl.(liquidWaterContent)
  • Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
  • Height, cloud base, height where IR temp. matches retrieved temp. profile(cloudBaseHeight)
  • Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)
  • MET air temperature(temperature)
  • Mixing ratio, water vap., vert. prof. sfc-10km, frm retr. water vap. dens. prof(waterVaporMixingRatio)


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DQRID : D060713.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/05/2006000001/08/20070000Incorrect
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 : D060929.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
08/01/2006000008/31/20062359Suspect
Subject:
NIM/MWRP/M1 - Sun in radiometer's field of view
DataStreams:nimmwrpM1.b1
Description:
Around noon local time every day there is a spike in the brightness temperature data. This 
is due to the sun being in the field of view of the radiometer. PWV and LWP are affected 
as a consequence
Measurements:nimmwrpM1.b1:
  • Microwave brightness temperature(brightnessTemperature)
  • Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
  • totalPrecipitableWaterRmsError
  • liquidWaterPathRmsError
  • infraredTemperature
  • liquidWaterPath2RmsError
  • Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
  • totalPrecipitableWater2RmsError
  • Liquid water content, cloud, vert. prof. sfc.-10km, from Tbright stat. retrvl.(liquidWaterContent)
  • Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)
  • Liquid water path, from Tbright at 23.835 and 30.0 GHz only, using stat. retrvl.(liquidWaterPath2)
  • liquidWaterContentRmsError


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DQRID : D061003.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/09/2006000106/07/20061900Suspect
Subject:
NIM/MWRP/M1 - IRTs do not agree with AERI
DataStreams:nimmwrpM1.b1
Description:
Since deployment at PYE, and then at NIM, the AMF SKYRAD IRT measured about 10K higher sky 
temperatures than the AERI and the MWRP IRT measured about 20K higher than the AERI.  
Several actions were taken to diagnose the problem including confirming the correct 
configuration of the IRTs and data logger, cleaning the mirror and lens, and replacing the mirror.

After several days of rain beginning 6/2/2006, the three instruments came into agreement. 
The cause of the discrepancy was probably dust accumulation on the lens of the instrument
Measurements:nimmwrpM1.b1:
  • infraredTemperature


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DQRID : D061117.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
10/01/2006000011/17/20061713Does not affect quality
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:
  • Microwave brightness temperature(brightnessTemperature)
  • Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
  • Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
  • Liquid water content, cloud, vert. prof. sfc.-10km, from Tbright stat. retrvl.(liquidWaterContent)
  • Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)
  • Liquid water path, from Tbright at 23.835 and 30.0 GHz only, using stat. retrvl.(liquidWaterPath2)


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