The author acknowledges useful discussions with Norm McFarlane, Glen Lesins, Hans Luthardt, and Michael Neish. The Canadian Centre for Climate Modelling and Analysis (CCCma) provided the ACGM3 and AGCM4 output. We thank the following institutions for making their data public: NASA (TRMM 3B42), NCDC (IGRA), NOAA (GFDL CM2.1), ECMWF (ERA-40/Interim), and WDCC (ECHAM5). Comments and suggestions by two anonymous reviewers greatly improved the manuscript. This research was funded by the Natural Sciences and Engineering Research Council (NSERC), the Canadian Foundation for Climate and Atmospheric Sciences (CFCAS), and the Canadian Space Agency (CSA).
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