有机气溶胶的光吸收特性如何改变亚洲夏季风降水？
How light absorbing properties of organic aerosol modify the Asian summer monsoon rainfall?
作者信息
Chu Jung-Eun, Kim Kyu-Myong, Lau William K M, Ha Kyung-Ja
机构信息
Center for Climate Physics, Institute for Basic Science (IBS), Busan, South Korea, 46241.
Department of Atmospheric Sciences, Pusan National University, Busan, South Korea, 46241.
出版信息
J Geophys Res Atmos. 2018 Feb 27;123(4):2244-2255. doi: 10.1002/2017jd027642. Epub 2018 Feb 6.
Light absorbing aerosols not only contribute to Earth's radiative balance but also influence regional climate by cooling the surface and warming the atmosphere. Following recent suggestions that organic aerosols (OAs) absorb substantial amount of solar radiation, we examine the role of light absorbing properties of OA on Asian summer monsoon rainfall redistribution using observational data and an atmospheric general circulation model (AGCM) experiment. Results suggest that the enhanced light absorption by OA in Southeast Asia and Northeast Asia are associated with the advance of the Indian summer monsoon in May and the southward shift of East Asian summer monsoon rain band in June. The rainfall redistribution in May is induced by elevated orographic effect with a warm-core upper-level anticyclone and surface warming of 1-2°C over the Tibetan Plateau whereas that of the East Asian summer monsoon in June is formed by stable conditions associated with surface cooling and atmospheric warming around 30°N.
吸光气溶胶不仅影响地球辐射平衡，还通过冷却地表和加热大气来影响区域气候。近期有观点认为有机气溶胶（OA）吸收大量太阳辐射，据此我们利用观测数据和大气环流模式（AGCM）实验，研究了OA吸光特性对亚洲夏季风降雨再分布的作用。结果表明，东南亚和东北亚OA吸光增强与5月印度夏季风推进以及6月东亚夏季风雨带南移有关。5月的降雨再分布是由青藏高原暖芯高空反气旋的地形增强效应以及1 - 2°C的地表升温引起的，而6月东亚夏季风的降雨再分布则是由30°N附近地表冷却和大气变暖相关的稳定条件形成的。
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