Evaluation of the distribution of subtropical free tropospheric humidity in AMIP-2 simulations using METEOSAT water vapor channel data

Details Evaluation of the distribution of subtropical free tropospheric humidity in AMIP-2 simulations using METEOSAT water vapor channel data Evaluation of the distribution of subtropical free tropospheric humidity in AMIP-2 simulations using METEOSAT water vapor channel data

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3219708b&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 19, CiteID L19708

Statistics

Methodology

9

Global Change: Atmosphere (0315, 0325), Global Change: Global Climate Models (3337, 4928), Global Change: Remote Sensing (1855)

Scientific paper

In the framework of the Atmospheric Model Intercomparison Project (AMIP) phase 2, we have established a diagnostic of the free tropospheric humidity (FTH) distribution using METEOSAT data over the 1984-1995 period for 14 climate models. The methodology of evaluation follows a two step ``model-to-satellite'' approach. First the raw METEOSAT ``Water Vapor'' radiances are simulated from the model profiles of temperature and humidity using the RTTOV-7 radiative transfer model. Second, the radiances are converted into FTH using the same coefficients as in the satellite product offering a direct comparison. The analysis is focused on the dry subtropical areas observed by METEOSAT: the Eastern Mediterranean and the tropical South Atlantic Ocean. Most of the models reproduce the observed seasonal cycle both in terms of phasing and magnitude, despite an overall moist bias. A few models are in close agreement with the satellite data. The magnitude of the satellite estimated inter-annual variability is also generally captured by models. Again, a small subset of models shows close agreement with the observations. This comparison suggests general improvements of the models with respect to the AMIP-1 simulations.

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