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Analysis of moisture variability in the European Centre for Medium-Range Weather Forecasts 15-year
 

Summary: Analysis of moisture variability in the European Centre
for Medium-Range Weather Forecasts 15-year
reanalysis over the tropical oceans
Richard P. Allan and A. Slingo1
Hadley Centre, Met Office, Bracknell, UK
V. Ramaswamy
Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA
Received 23 July 2001; revised 20 December 2001; accepted 26 December 2001; published 2 August 2002.
[1] We compare European Centre for Medium-Range Weather Forecasts 15-year
reanalysis (ERA-15) moisture over the tropical oceans with satellite observations and the
U.S. National Centers for Environmental Prediction (NCEP) National Center for
Atmospheric Research 40-year reanalysis. When systematic differences in moisture
between the observational and reanalysis data sets are removed, the NCEP data show
excellent agreement with the observations while the ERA-15 variability exhibits
remarkable differences. By forcing agreement between ERA-15 column water vapor and
the observations, where available, by scaling the entire moisture column accordingly, the
height-dependent moisture variability remains unchanged for all but the 550850 hPa
layer, where the moisture variability reduces significantly. Thus the excess variation
of column moisture in ERA-15 appears to originate in this layer. The moisture variability
provided by ERA-15 is not deemed of sufficient quality for use in the validation of

  

Source: Allan, Richard P. - Department of Meteorology, University of Reading

 

Collections: Geosciences