DQRID : D060619.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/01/2006000008/24/20062300Does not affect quality
NIM/MWRP/M1 - Reprocessed - New retrieval coefficients
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.
Retrieve reprocessed data for use in your analysis.
  • waterVaporDensity
  • totalPrecipitableWaterRmsError
  • cloudBaseHeight
  • relativeHumidity
  • waterVaporDensityRmsError
  • dewpointTemperature
  • totalPrecipitableWater2RmsError
  • totalPrecipitableWater2
  • virtualTemperature
  • totalPrecipitableWater
  • liquidWaterPath
  • temperature
  • waterVaporMixingRatio
  • temperatureRmsError
  • liquidWaterContent
  • liquidWaterPath2
  • liquidWaterPath2RmsError
  • liquidWaterContentRmsError
  • liquidWaterPathRmsError

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