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Impact of anthropogenic forcing on the Asian summer monsoon as simulated by eight GCMs
Author(s) -
Ueda Hiroaki,
Iwai Ayaka,
Kuwako Ken,
Hori Masatake E.
Publication year - 2006
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 - 10.1029/2005gl025336
Subject(s) - climatology , monsoon , environmental science , forcing (mathematics) , troposphere , walker circulation , atmospheric sciences , east asian monsoon , convergence zone , radiative forcing , atmospheric circulation , global warming , monsoon of south asia , moisture , climate change , geology , sea surface temperature , oceanography , geography , meteorology
The response of the Asian summer monsoon (ASM) to a transient increase in future anthropogenic radiative forcing is investigated by multi‐model global warming experiments. Most models show that, in Asia, the summer monsoon rainfall increases significantly with global warming. On the other hand, the future change in the large‐scale flow indicates a weakening of the ASM circulation. Enhanced moisture transport over the Asian summer monsoon region, associated with the increased moisture source from the warmer Indian Ocean, leads to a larger moisture flux convergence, which is responsible for the intensification of the mean rainfall. Pronounced warming over the tropics in the middle‐to‐upper troposphere causes a reduction in the meridional thermal gradient in the Asian region, which is consistent with the weakened monsoon circulation and eastward shift of the Walker circulation.