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

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,...

Full description

Bibliographic Details
Published in:Atmospheric Science Letters
Main Authors: Ben Daoud, A., Sauquet, E., Lang, M., Obled, C., Bontron, G.
Other Authors: CEMAGREF LYON UR HHLY FRA, LTHE GRENOBLE, CNR LYON
Format: Article in Journal/Newspaper
Language:English
Published: 2009
Subjects:
HUMIDITE
METEOROLOGIE
ANORMALITE
RADIOSONDAGE
ERA-40
RE-ANALYSES
RELATIVE HUMIDITY
NCEP/NCAR
WESTERN EUROPE
RADIO SOUNDING
ANOMALOUS VALUES
MOISTURE
METEOROLOGY
North Atlantic
Online Access:https://irsteadoc.irstea.fr/cemoa/PUB00026017
Description
Summary: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.

Similar Items