文章基本信息

标题：Southward migration of the Southern Hemisphere westerly winds corresponds with warming climate over centennial timescales
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作者：Bianca B. Perren ; Dominic A. Hodgson ; Stephen J. Roberts 等
期刊名称：Communications Earth & Environment
电子版ISSN：2662-4435
出版年度：2020
卷号：1
期号：1
页码：1-8
DOI：10.1038/s43247-020-00059-6
语种：English
出版社：Nature Research
摘要：Recent changes in the strength and location of the Southern Hemisphere westerly winds (SHW) have been linked to continental droughts and wildfires, changes in the Southern Ocean carbon sink, sea ice extent, ocean circulation, and ice shelf stability. Despite their critical role, our ability to predict their impacts underfuture climates is limited by a lack of data on SHW behaviour over centennial timescales. Here, we present a 700-year record of changes in SHW intensity from sub-Antarctic Marion Island using diatom and geochemical proxies and compare it with paleoclimate records and recent instrumental data. During cool periods, such as the Little Ice Age (c. 1400-1870 CE), the winds weakened and shifted towards the equator, and during warm periods they intensified and migrated poleward. These results imply that changesinthelatitudinal temperature gradient drivecentury-scale SHW migrations, and that intensification of impacts can be anticipated in the coming century. Warmer periods correspond with poleward migration of the Southern Hemisphere westerly winds over the past 700 years and vice versa, according to multi-proxy records from a lake sediment core on sub-Antarctic Marion Island.