Poleward stationary eddy heat transport by the Tibetan Plateau and equatorward shift of westerlies during northern winter

TitlePoleward stationary eddy heat transport by the Tibetan Plateau and equatorward shift of westerlies during northern winter
Publication TypeJournal Article
Year of Publication2013
AuthorsPark H.S, Xie SP, Son S.W
JournalJournal of the Atmospheric Sciences
Volume70
Pagination3288-3301
Date Published2013/10
ISBN Number0022-4928
Accession NumberWOS:000325147900018
Abstract

The orographic effect of the Tibetan Plateau on atmospheric poleward heat transport is investigated using an atmospheric general circulation model. The linear interference between the Tibetan Plateau–induced winds and the eddy temperature field associated with the land–sea thermal contrast is a key factor for enhancing the poleward stationary eddy heat transport. Specifically, Tibetan Plateau–induced stationary waves produce northerlies over the cold eastern Eurasian continent, leading to a poleward heat transport. In another hot spot of stationary eddy heat transport over the eastern North Pacific, Tibetan Plateau–induced stationary waves transport relatively warm marine air northward.

In an experiment where the Tibetan Plateau is removed, the poleward heat transport is mostly accomplished by transient eddies, similar to the Southern Hemisphere. In the presence of the Tibetan Plateau, the enhanced stationary eddy heat transport is offset by a comparable reduction in transient eddy heat transport. This compensation between stationary and transient eddy heat transport is seen in observed interannual variability. Both the model and observations indicate that an enhanced poleward heat transport by stationary waves weakens transient eddies by decreasing the meridional temperature gradient and the associated westerlies in midlatitudes.

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