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Comparison of 850-hPa relative humidity between ERA-40 and NCEP/NCAR re-analyses: detection of suspicious data in ERA-40

Abstract : An exploratory study is performed on the 850-hPa relative humidity data (RH850) extracted from the Re-Analysis Project (ERA-40) and National Centers for Environmental Prediction (NCEP)/National Center for Atmospheric Research (NCAR) re-analyses covering a domain centred on western Europe (60°W-60°E, 15°N-75°N). The largest deviations between the two data archives are observed over the North Atlantic Ocean. In addition, unrealistic values of RH850 are detected in the ERA-40 re-analysis at resolutions of both 2.5° and 1.125°. There is no strong correlation between RH850 provided by ERA-40 and observations from radio sounding stations, thus ruling out a straightforward correction of the detected anomalous values. Copyright © 2009 Royal Meteorological Society
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https://hal-insu.archives-ouvertes.fr/insu-00411903
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Submitted on : Monday, August 31, 2009 - 10:24:16 AM
Last modification on : Friday, September 25, 2020 - 11:02:44 AM

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Aurélien Ben Daoud, E. Sauquet, Michel Lang, Charles Obled, Guillaume Bontron. Comparison of 850-hPa relative humidity between ERA-40 and NCEP/NCAR re-analyses: detection of suspicious data in ERA-40. Atmospheric Science Letters, Wiley, 2009, 10 (1), pp.43-47. ⟨10.1002/asl.208⟩. ⟨insu-00411903⟩

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