Earlier onset of the Indian monsoon in the late twentieth century: The role of anthropogenic aerosols
Earlier onset of the Indian monsoon in the late twentieth century: The role of anthropogenic aerosols
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DOI：
10.1002/grl.50719
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发表时间：
2013-07
影响因子：
5.2
通讯作者：
M. Bollasina;Y. Ming;V. Ramaswamy
中科院分区：
文献类型：
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作者：
M. Bollasina;Y. Ming;V. Ramaswamy
利用气溶胶和化学完全相互作用的最先进的气候模式研究了世纪后期人为气溶胶增加对印度季风爆发的影响。我们发现，气溶胶可能是负责所观察到的发病较早，导致在印度大部分地区的6月降水增强。这种转变之前，强气溶胶强迫孟加拉湾和印度支那，主要是由于直接影响，导致大气稳定性增加，抑制季风迁移在5月。调整后的大气环流导致西北大陆地区的热力学变化，包括地表温度和近地表湿静能的增加，这支持了6月更强的气流，并在印度洋相对变暖的推动下，导致降水向西北方向转移。这些发现强调了动力反馈和区域陆面过程对气溶胶-季风联系的重要性。
The impact of the late twentieth century increase of anthropogenic aerosols on the Indian monsoon onset was investigated with a state‐of‐the‐art climate model with fully interactive aerosols and chemistry. We find that aerosols are likely responsible for the observed earlier onset, resulting in enhanced June precipitation over most of India. This shift is preceded by strong aerosol forcing over the Bay of Bengal and Indochina, mostly attributable to the direct effect, resulting in increased atmospheric stability that inhibits the monsoon migration in May. The adjusted atmospheric circulation leads to thermodynamic changes over the northwestern continental region, including increased surface temperature and near‐surface moist static energy, which support a stronger June flow and, facilitated by a relative warming of the Indian Ocean, a vigorous northwestward precipitation shift. These findings underscore the importance of dynamical feedbacks and of regional land‐surface processes for the aerosol‐monsoon link.