Southward migration of the Southern Hemisphere westerly winds corresponds with warming climate over centennial timescales

摘要: Recent changes in the strength and location of Southern Hemisphere westerly winds (SHW) have been linked to continental droughts wildfires, Ocean carbon sink, sea ice extent, ocean circulation, shelf stability. Despite their critical role, our ability predict impacts under future climates is limited by a lack data on SHW behaviour over centennial timescales. Here, we present 700-year record intensity from sub-Antarctic Marion Island using diatom geochemical proxies compare it with paleoclimate records recent instrumental data. During cool periods, such as Little Ice Age (c. 1400–1870 CE), weakened shifted towards equator, during warm periods they intensified migrated poleward. These results imply that changes in the latitudinal temperature gradient drive century-scale migrations, intensification can be anticipated coming century. Warmer correspond poleward migration past 700 years vice versa, according multi-proxy lake sediment core Island.