This page is an abstract of the article, E. P. Salathe and
D. L. Hartmann, 1999: Subsidence and Upper-Tropospheric Drying along Trajectoriesin a General Circulation Model. accepted for publication in J. Climate.
© Copyright American Meteorological Society
The full text can be viewed in html or download PDF for printing using Acrobat.
A trajectory analysis of the CCM3 moisture simulation is used to show
that the model simulates upper-tropospheric moisture observations
better than would be inferred from a traditional geographical
comparison. The upper-tropospheric moisture simulation is compared to
upper-tropospheric moisture derived from GOES 6.7-micron observations
for September 1992. Trajectories start in convective regions of the
tropics and are followed into non-convective subsidence
regions. Moisture and pressure along the trajectories are determined
for both the model and observations. Humidity values as a function of
subsidence agree much better between observations and model than do
geographical grid box comparisons, because the model does not simulate
details in the large-scale flow pattern precisely. The relative
humidity decreases slightly more slowly with subsidence along
trajectories in the CCM3 simulation than in observations.
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