An Ensemble Mean and Evaluation of Third Generation Global Climate Reanalysis Models

作者：Auger Jeffrey D^*; Birkel Sean D; Maasch Kirk A; Mayewski Paul A; Schuenemann Keah C

来源：Atmosphere, 2018, 9(6): 236.

DOI：10.3390/atmos9060236

• reanalysis models
• temperature
• precipitation
• geopotential height

We have produced a global ensemble mean of the four third-generation climate reanalysis models for the years 1981-2010. The reanalysis system models used in this study are National Centers for Environmental Prediction (NCEP) Climate Forecast System Reanalysis (CFSR), European Centre for Medium-Range Weather Forecasts (ECMWF) Reanalysis Interim (ERA-I), Japan Meteorological Agency (JMA) 55-year Reanalysis (JRA-55), and National Aeronautics and Space Administration (NASA) Modern-Era Retrospective Analysis for Research and Applications (MERRA). Two gridded datasets are used as a baseline, for temperature the Global Historical Climatology Network (GHCN), and for precipitation the Global Precipitation Climatology Centre (GPCC). The reanalysis ensemble mean is used here as a comparison tool of the four reanalysis members. Meteorological fields investigated within the reanalysis models include 2-m air temperature, precipitation, and 500-hPa geopotential heights. Comparing the individual reanalysis models to the ensemble mean, we find that each perform similarly over large domains but exhibit significant differences over particular regions.

• 出版日期2018-6