Contribution of local and remote anthropogenic aerosols to the twentieth century weakening of the South Asian Monsoon
Contribution of local and remote anthropogenic aerosols to the twentieth century weakening of the South Asian Monsoon
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DOI：
10.1002/2013gl058183
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发表时间：
2014-01-28
影响因子：
5.2
通讯作者：
Naik, Vaishali
中科院分区：
文献类型：
--
作者：
Bollasina, Massimo A.;Ming, Yi;Naik, Vaishali
利用最先进的气候模式进行历史模拟，研究了20世纪后期南亚季风对来自本地（即南亚）和远程（即南亚以外）来源的人为气溶胶变化的响应。一旦当地气溶胶排放保持在工业化前的水平，而所有其他强迫都在演变，观测到的印度夏季干燥就会被广泛的湿润所取代。持续的远程气溶胶排放部分抑制了降水的减少。因此，虽然印度的主要降水变化与当地气溶胶有关，但远程气溶胶也有贡献，特别是有利于6月季风的提前发生，并增强西北地区的夏季降雨。相反，南亚的温度和近地表环流变化更有效地由远距离气溶胶驱动。这些变化反映在大气能量输送的北跨赤道异常中，这种异常是由局地气溶胶和在更大程度上由远距离气溶胶引起的。局地气溶胶和远地气溶胶共同影响季风，局地气溶胶和远地气溶胶之间复杂的相互作用决定了季风的响应，环流变化起着重要的作用
The late twentieth century response of the South Asian monsoon to changes in anthropogenic aerosols from local (i.e., South Asia) and remote (i.e., outside South Asia) sources was investigated using historical simulations with a state-of-the-art climate model. The observed summertime drying over India is replaced by widespread wettening once local aerosol emissions are kept at preindustrial levels while all the other forcings evolve. Constant remote aerosol emissions partially suppress the precipitation decrease. While predominant precipitation changes over India are thus associated with local aerosols, remote aerosols contribute as well, especially in favoring an earlier monsoon onset in June and enhancing summertime rainfall over the northwestern regions. Conversely, temperature and near-surface circulation changes over South Asia are more effectively driven by remote aerosols. These changes are reflected into northward cross-equatorial anomalies in the atmospheric energy transport induced by both local and, to a greater extent, remote aerosols.Key Points Both local and remote aerosols affect the monsoon Complex interactions between local and remote aerosols determine the response Circulation changes play an important role