The Influence of Volcanic Aerosol Meridional Structure on Monsoon Responses over the Last Millennium
The Influence of Volcanic Aerosol Meridional Structure on Monsoon Responses over the Last Millennium
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DOI：
10.1029/2019gl084377
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发表时间：
2019-11-06
影响因子：
5.2
通讯作者：
Stevenson, Samantha
中科院分区：
文献类型：
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作者：
Fasullo, John T.;Otto-Bliesner, Bette L.;Stevenson, Samantha
季风响应喷发在过去的一千年（LM）的气候模拟作为一个功能的喷发半球的合奏检查。一个复合分析揭示了一个特别强的敏感性季风降雨在一年后，北方（NH）的热带风暴爆发。对18世纪世纪火山喷发的进一步分析。拉基和理想化的模拟代表了一个模拟南半球喷发（SH-拉基）揭示季风的反应，大约是对称的半球，尽管表现出不对称的气候响应的其他方面。我们的结论是：1）纬度镜像喷发导致近似对称的季风响应，2）不成比例的削弱（加强）的NH（SH）季风的NH爆发在LM导致部分从相对较高的纬度，和3）在喷发纬度的不确定性从根本上限制了我们的能力，准确地模拟相关的季风和热带降水的响应在自然界中。
Monsoon responses to eruptions over the last millennium (LM) are examined in an ensemble of climate simulations as a function of eruption hemisphere. A composite analysis reveals a particularly strong sensitivity of monsoon rainfall in the year following Northern Hemisphere (NH) extratropical eruptions. Additional analysis focusing on the 18th century eruption of Mt. Laki and idealized simulations representing an analogue Southern Hemisphere eruption (SH-Laki) reveal monsoon responses that are approximately symmetric across hemispheres, despite exhibiting asymmetries in other aspects of the climate response. We conclude that 1) latitudinally mirrored eruptions result in approximately symmetric monsoon responses, 2) disproportionate weakening (strengthening) of NH (SH) monsoons by NH eruptions over the LM resulted in part from their relatively high latitudes, and 3) uncertainty in eruption latitude fundamentally limits our ability to accurately simulate associated monsoon and tropical precipitation responses in nature.