Global monsoon precipitation responses to large volcanic eruptions.
Global monsoon precipitation responses to large volcanic eruptions.
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DOI：
10.1038/srep24331
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发表时间：
2016-04-11
影响因子：
4.6
通讯作者：
Wang Z
中科院分区：
文献类型：
--
作者：
Liu F;Chai J;Wang B;Liu J;Zhang X;Wang Z
全球季风（GM）降水的气候变化既有内部反馈，也有外部强迫。在这里，我们专注于强大的火山强迫，因为大爆发是已知的自然气候变化的主导机制。目前还不清楚在不同纬度爆发的大型火山是否对北方半球（NH）和南半球（SH）的季风有不同的影响。我们使用社区地球系统模型1.0版（CESM 1）的1500年火山敏感性模拟来解决这个问题。根据气溶胶的纬向分布，火山可分为三种类型：北半球火山、南半球火山和赤道火山。利用模式模拟，我们发现，GM降水在一个半球的增强显着的远程火山强迫发生在另一个半球。这种远程火山强迫导致的强化主要是通过环流变化而不是水分含量的变化。此外，北半球火山喷发在减少北半球季风降水方面比赤道火山喷发更有效，南半球火山喷发在减弱南半球季风方面也是如此，因为赤道火山喷发尽管减少了水分含量，但在减弱赤道外季风环流方面的作用比亚热带-热带外火山喷发弱。
Climate variation of global monsoon (GM) precipitation involves both internal feedback and external forcing. Here, we focus on strong volcanic forcing since large eruptions are known to be a dominant mechanism in natural climate change. It is not known whether large volcanoes erupted at different latitudes have distinctive effects on the monsoon in the Northern Hemisphere (NH) and the Southern Hemisphere (SH). We address this issue using a 1500-year volcanic sensitivity simulation by the Community Earth System Model version 1.0 (CESM1). Volcanoes are classified into three types based on their meridional aerosol distributions: NH volcanoes, SH volcanoes and equatorial volcanoes. Using the model simulation, we discover that the GM precipitation in one hemisphere is enhanced significantly by the remote volcanic forcing occurring in the other hemisphere. This remote volcanic forcing-induced intensification is mainly through circulation change rather than moisture content change. In addition, the NH volcanic eruptions are more efficient in reducing the NH monsoon precipitation than the equatorial ones, and so do the SH eruptions in weakening the SH monsoon, because the equatorial eruptions, despite reducing moisture content, have weaker effects in weakening the off-equatorial monsoon circulation than the subtropical-extratropical volcanoes do.