DOI: 10.1007/s00382-016-3211-7
Scopus记录号: 2-s2.0-84973661002
论文题名: A GCM investigation of impact of aerosols on the precipitation in Amazon during the dry to wet transition
作者: Gu Y. ; Liou K.N. ; Jiang J.H. ; Fu R. ; Lu S. ; Xue Y.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-07-08 起始页码: 2393
结束页码: 2404
语种: 英语
英文摘要: The climatic effects of aerosols on the precipitation over the Amazon during the dry to wet transition period have been investigated using an atmospheric general circulation model, NCEP/AGCM, and the aerosol climatology data. We found increased instability during the dry season and delayed wet season onset with aerosols included in the model simulation, leading to the delay of the maximum precipitation over the Amazon by about half a month. In particular, our GCM simulations show that surface solar flux is reduced in the Amazon due to the absorption and scattering of the solar radiation by aerosols, leading to decreased surface temperature. Reduced surface solar flux is balanced by decreases in both surface sensible heat and latent heat fluxes. During the wet season, the subtropical system over the Amazon has a shallower convection. With the inclusion of aerosols in the simulation, precipitation in the rainy season over the Amazon decreases in the major rainfall band, which partially corrects the overestimate of the simulated precipitation in that region. The reduced surface temperature by aerosols is also coupled with a warming in the middle troposphere, leading to increased atmosphere stability and moisture divergence over the Amazon. However, during the dry season when the convective system is stronger over the Amazon, rainfall increases in that region due to the warming of the air over the upper troposphere produced by biomass burning aerosols, which produces an anomalous upward motion and a convergence of moisture flux over the Amazon and draws the moisture and precipitation further inland. Therefore, aerosol effects on precipitation depend on the large-scale atmospheric stability, resulting in their different roles over the Amazon during the dry and wet seasons. © 2016, Springer-Verlag Berlin Heidelberg.
资助项目: NSF, National Science Foundation
; DOE, U.S. Department of Energy
; NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53271
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Atmospheric and Oceanic Science, Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; University at Albany, State University of New York, Albany, NY, United States; Department of Geography, University of California, Los Angeles, CA, United States
Recommended Citation:
Gu Y.,Liou K.N.,Jiang J.H.,et al. A GCM investigation of impact of aerosols on the precipitation in Amazon during the dry to wet transition[J]. Climate Dynamics,2017-01-01,48(2017-07-08)