Transport of water vapour in a stratosphere‐troposphere general circulation model. I: Fluxes

The fluxes of water vapour in the upper troposphere and lower stratosphere of a general circulation model have been calculated. Although the results are probably affected by some model characteristics, particularly the vertical resolution, they suggest that ingress of water vapour to the stratosphere may occur by large‐scale eddy motions above the core of the subtropical jet stream, as well as by vertical motion through the tropical tropopause. The latter motion occurs predominantly in the equatorial western Pacific and Indian Ocean, and is connected with the monsoon circulation.