Impact of biomass burning aerosol on the monsoon circulation transition over Amazonia

被引：52

作者：

Zhang, Yan ^{[1
]}

Fu, Rong ^{[2
]}

Yu, Hongbin ^{[3
,4
]}

Qian, Yun ^{[6
]}

Dickinson, Robert ^{[2
]}

Silva Dias, Maria Assuncao F. ^{[5
]}

da Silva Dias, Pedro L. ^{[5
]}

Fernandes, Katia ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA

[2] Univ Texas Austin, Jackson Sch Geosci, Dept Geol Sci, Austin, TX 78705 USA

[3] Univ Maryland Baltimore Cty, Goddard Earth Sci & Technol Ctr, Baltimore, MD 21228 USA

[4] NASA, Goddard Space Flight Ctr, Atmospheres Lab, Greenbelt, MD 20771 USA

[5] Univ Sao Paulo, Dept Atmospher Sci, BR-05508900 Sao Paulo, Brazil

[6] Pacific NW Natl Lab, Richland, WA 99352 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2009年 / 36卷

基金：

美国国家科学基金会;

关键词：

TROPICAL SOUTH-AMERICA; LA-PLATA BASIN; MODIS RETRIEVALS; GOCART MODEL; WET SEASON; SMOKE; SATELLITE; PRECIPITATION; SIMULATIONS; ONSET;

D O I：

10.1029/2009GL037180

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Ensemble simulations of a regional climate model (RegCM3) forced by aerosol radiative forcing suggest that biomass burning aerosols can work against the seasonal monsoon circulation transition, thus re-enforce the dry season rainfall pattern for Southern Amazonia. Strongly absorbing smoke aerosols warm and stabilize the lower troposphere within the smoke center in southern Amazonia (where aerosol optical depth >0.3). These changes increase the surface pressure in the smoke center, weaken the southward surface pressure gradient between northern and southern Amazonia, and consequently induce an anomalous moisture divergence in the smoke center and an anomalous convergence in northwestern Amazonia (5 degrees S-5 degrees N, 60 degrees W-70 degrees W). The increased atmospheric thermodynamic stability, surface pressure, and divergent flow in Southern Amazonia may inhibit synoptic cyclonic activities propagated from extratropical South America, and re-enforce winter-like synoptic cyclonic activities and rainfall in southeastern Brazil, Paraguay and northeastern Argentina. Citation: Zhang, Y., R. Fu, H. Yu, Y. Qian, R. Dickinson, M. A. F. Silva Dias, P. L. da Silva Dias, and K. Fernandes (2009), Impact of biomass burning aerosol on the monsoon circulation transition over Amazonia, Geophys. Res. Lett., 36, L10814, doi: 10.1029/2009GL037180.

引用

页数：6

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