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  • John, V.O. and B. J. Soden, 2007: Temperature and humidity biases in global climate models and. Geophys. Res. Lett.. Accepted.

A comparison of AIRS temperature and humidity retrievals
to those simulated from climate models reveals large
biases. The model simulated temperatures are systematically
colder by 1-4 K throughout the troposphere. On average,
current models also simulate a large moist bias in the
free troposphere (up to 100 %) but a dry bias in the boundary
layer (up to 25 %). While the overall pattern of biases is
fairly common from model to model, the magnitude of these
biases is not. In particular, the free tropospheric cold and
moist bias varies significantly from one model to the next.
In contrast, the response of water vapor and tropospheric
temperature to a surface warming is shown to be remarkably
consistent across models and uncorrelated to the bias
in the mean state. We further show that these biases, while
significant, have little direct impact on the models simulation
of temperature and water vapor feedbacks.


Last Updated: 2007-07-27

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