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Dynamical Control of the Tibetan Plateau on the East Asian Summer Monsoon
Author(s) -
Son JunHyeok,
Seo KyongHwan,
Wang Bin
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl083104
Subject(s) - plateau (mathematics) , climatology , rossby wave , monsoon , forcing (mathematics) , east asia , precipitation , east asian monsoon , northern hemisphere , subtropics , middle latitudes , geology , atmospheric sciences , geography , meteorology , china , mathematical analysis , mathematics , archaeology , fishery , biology
The origin of the East Asian summer monsoon (EASM)—the sole monsoon existing in the subtropics‐midlatitude in the northern hemisphere—has long been recognized as an elevated heating and mechanical forcing of the Tibetan Plateau, and the land‐sea zonal heat contrast. However, the relative contribution of individual processes to the generation of the East Asian summer monsoon and therefore the underlying basic physics are unexplored. Here we show that the EASM is mainly driven by the dynamical effect of the Tibetan Plateau, in which forced topographic Rossby waves induce downstream southerlies, a crucial factor in EASM precipitation. From idealized general circulation model simulations, the dynamical effect of mountains is revealed to account for ~65% of the total East Asian summer precipitation, whereas the elevated heating and land‐sea heat contrast are only responsible for ~15% each and the mountain‐drag effect accounts for less than 5%.