Positive response of Indian summer rainfall to Middle East dust
Positive response of Indian summer rainfall to Middle East dust
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DOI：
10.1002/2014gl059980
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发表时间：
2014-06-16
影响因子：
5.2
通讯作者：
Yang, Zong-Liang
中科院分区：
文献类型：
--
作者：
Jin, Qinjian;Wei, Jiangfeng;Yang, Zong-Liang
利用观测和再分析资料，研究了中东和阿拉伯海(AS)沙尘气溶胶对印度夏季风(ISM)降水的影响。卫星和气溶胶再分析数据显示，在ISM季节，中东地区和AS上空的气溶胶负荷极大，主要是矿物粉尘。多变量经验正交函数分析表明，气溶胶与季风之间存在联系。这种联系可能归因于以伊朗高原(IP)为中心的沙尘引起的大气加热，它增强了经向热对比度，增强了ISM环流和降水。增强的环流进一步将更多的粉尘输送到AS和IP，加热大气(正反馈)。AS和阿拉伯半岛上空的气溶胶与大约两周后印度中部和东部的降雨量有很大的相关性。这一发现突出了沙尘对ISM环流和降水的非局地辐射效应，并可能改善ISM降水预报。
Using observational and reanalyses data, we investigated the impact of dust aerosols over the Middle East and the Arabian Sea (AS) on the Indian summer monsoon (ISM) rainfall. Satellite and aerosol reanalysis data show extremely heavy aerosol loading, mainly mineral dust, over the Middle East and AS during the ISM season. Multivariate empirical orthogonal function analyses suggest an aerosol-monsoon connection. This connection may be attributed to dust-induced atmospheric heating centered over the Iranian Plateau (IP), which enhances the meridional thermal contrast and strengthens the ISM circulation and rainfall. The enhanced circulation further transports more dust to the AS and IP, heating the atmosphere (positive feedback). The aerosols over the AS and the Arabian Peninsula have a significant correlation with rainfall over central and eastern India about 2 weeks later. This finding highlights the nonlocal radiative effect of dust on the ISM circulation and rainfall and may improve ISM rainfall forecasts.