Anthropogenic Aerosols and the Weakening of the South Asian Summer Monsoon
Anthropogenic Aerosols and the Weakening of the South Asian Summer Monsoon
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DOI：
10.1126/science.1204994
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发表时间：
2011-10-28
期刊：
影响因子：
56.9
通讯作者：
Ramaswamy, V.
中科院分区：
文献类型：
--
作者：
Bollasina, Massimo A.;Ming, Yi;Ramaswamy, V.
观察表明，南亚在20世纪下半叶经历了广泛的夏季干旱，但尚不清楚这一趋势是由于自然变化还是人类活动造成的。我们使用了一系列气候模型实验来研究南亚季风对自然和人为强迫的响应。我们发现，观测到的降水减少主要归因于人类影响的气溶胶排放。干燥是热带经向翻转环流减缓的强劲结果，这补偿了气溶胶引起的南北半球之间的能量失衡。这些结果提供了令人信服的证据，证明气溶胶在影响南亚区域气候变化方面发挥着重要作用。
Observations show that South Asia underwent a widespread summertime drying during the second half of the 20th century, but it is unclear whether this trend was due to natural variations or human activities. We used a series of climate model experiments to investigate the South Asian monsoon response to natural and anthropogenic forcings. We find that the observed precipitation decrease can be attributed mainly to human-influenced aerosol emissions. The drying is a robust outcome of a slowdown of the tropical meridional overturning circulation, which compensates for the aerosol-induced energy imbalance between the Northern and Southern Hemispheres. These results provide compelling evidence of the prominent role of aerosols in shaping regional climate change over South Asia.