Aerosol effects on summer monsoon over Asia during 1980s and 1990s: AEROSOL EFFECTS ON ASIAN SUMMER MONSOON

Tsai, I-Chun; Wang, Wei-Chyung; Hsu, Huang-Hsiung; Lee, Wei-Liang

doi:10.1002/2016jd025388

Aerosol effects on summer monsoon over Asia during 1980s and 1990s: AEROSOL EFFECTS ON ASIAN SUMMER MONSOON

Journal Article · Wed Sep 21 04:00:00 EDT 2016 · Journal of Geophysical Research: Atmospheres

DOI:https://doi.org/10.1002/2016jd025388· OSTI ID:1532985

Tsai, I-Chun ^[1]; Wang, Wei-Chyung ^[2]; Hsu, Huang-Hsiung ^[3]; Lee, Wei-Liang ^[3]

Academia Sinica, Taipei (Taiwan); DOE/OSTI
State Univ. of New York (SUNY), Albany, NY (United States)
Academia Sinica, Taipei (Taiwan)

The Community Earth System Model is used to study the aerosol climate effects during the 1980s and 1990s in which the anthropogenic SO₂ emissions decreased in North America and Western Europe and increased in East and South Asia. From the 100 year simulations, aerosol forcing results in cooler (-0.13 K) and drier (-0.01 mm/day) atmosphere with less shortwave radiation flux at the surface (-0.37 W/m²). The clear-sky shortwave radiation flux decreased over East Asia (-0.81 W/m²) and South Asia (-1.09 W/m²), but increased over Western Europe (+1.16 W/m²) and North America (+0.39 W/m²), consistent with aerosol loading changes. While changes in spatial distributions of all-sky shortwave radiation and surface temperature are closely related to cloud changes, the changes in wind and precipitation do not correspond to aerosol loading changes, indicating the complexity of aerosol-cloud circulation interactions. The East and South Asia monsoons were generally weakened due mainly to southward shift of the 200 hPa East Asia Jet (EAJ) and decrease in 850 hPa winds; annual precipitation decreased by 2% in South Asia but increased by 2% in Yangtze-Huai River Valley over East Asia. The uncertainties associated with aerosol climate effects are addressed within the context of model variability and the global warming effect. For the latter, while the aerosol effects decrease the greenhouse warming on the global mean, the regional responses are different. Nevertheless, the characteristics of aerosol climate effects, including the southward 200 hPa EAJ and weakened South Asia monsoon, still persist when the climate becomes warmer, although the strength and the geographical distribution are slightly modulated.

View Accepted Manuscript (DOE)

Research Organization:: State Univ. of New York (SUNY), Albany, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-92ER61369

OSTI ID:: 1532985

Alternate ID(s):: OSTI ID: 1402394

Journal Information:: Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Journal Issue: 19 Vol. 121; ISSN 2169-897X

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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