Global S&T Development Trend Analysis Platform of Resources and Environment
Southern Hemisphere westerly winds likely to intensify as climate warms | |
admin | |
2020-12-09 | |
发布年 | 2020 |
语种 | 英语 |
国家 | 英国 |
领域 | 资源环境 |
正文(英文) | Polar climate scientists have created the most high resolution past record of the Southern Hemisphere westerly winds. The results, published this week (9 December) in the journal Communications Earth and Environment, describe how the winds are likely to intensify and migrate poleward as the climate warms. The study provides data that will improve the accuracy of models predicting the future. The westerly winds (known by latitude as the roaring forties, furious fifties, and screaming sixties) are particularly strong due to the absence of continental landmasses in the Southern Ocean to slow them down. They play an important role in regulating how much carbon dioxide (greenhouse gas) is exchanged between the atmosphere and ocean and have been linked to droughts and wildfires, as well as changes in sea ice extent, ocean circulation and ice shelf stability. Researchers have recreated a 700-year record of the winds using radiocarbon dated sediment cores collected from a coastal lake on sub-Antarctic Marion Island. The island, located southeast of South Africa, is uniquely positioned in the core belt of the winds. The team measured changes in the accumulation rate of wind-blown sea salts by studying diatoms – tiny algae, specifically microalgae – embedded in the sediment, together with wind-blown dust, to track past wind strength. Results show that 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 (before 1450 and after 1920) they intensified and migrated poleward.
Southward migration of the Southern Hemisphere Westerly winds corresponds with warming climate over centennial timescales by Bianca B. Perren1*,Dominic A. Hodgson1,2, Stephen J. Roberts1, Louise Sime1, Wim Van Nieuwenhuyze3, Elie Verleyen3, Wim Vyverman3 is published in the journal (Nature) Communications Earth & Environment. This study was supported by British Antarctic Survey and the South African National Antarctic Programme in collaboration with researchers from the University of Ghent. Funding was from the UK Natural Environment Research Council, Research Foundation Flanders, Swiss Polar Institute and the South African Department of Environmental Affairs.
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URL | 查看原文 |
来源平台 | British Antarctic Survey |
文献类型 | 新闻 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/307749 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | admin. Southern Hemisphere westerly winds likely to intensify as climate warms. 2020. |
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