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DOI10.1038/s41561-019-0456-x
Australian hot and dry extremes induced by weakenings of the stratospheric polar vortex
Lim E.-P.; Hendon H.H.; Boschat G.; Hudson D.; Thompson D.W.J.; Dowdy A.J.; Arblaster J.M.
发表日期2019
ISSN17520894
卷号12期号:11
英文摘要The occurrence of extreme hot and dry conditions in warm seasons can have large impacts on human health, energy and water supplies, agriculture and wildfires. Australian hot and dry extremes have been known to be associated with the occurrence of El Niño and other variations of tropospheric circulation. Here we identify an additional driver: variability of the stratospheric Antarctic polar vortex. On the basis of statistical analyses using observational data covering the past 40 yr, we show that weakenings and warmings of the stratospheric polar vortex, which episodically occur during austral spring, substantially increase the chances of hot and dry extremes and of associated fire-conducive weather across subtropical eastern Australia from austral spring to early summer. The promotion of these Australian climate extremes results from the downward coupling of the weakened polar vortex to tropospheric levels, where it is linked to the low-index polarity of the Southern Annular Mode, an equatorward shift of the mid-latitude westerly jet stream and subsidence and warming in the subtropics. Because of the long timescale of the polar vortex variations, the enhanced likelihood of early-summertime hot and dry extremes and wildfire risks across eastern Australia may be predictable a season in advance during years of vortex weakenings. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种英语
scopus关键词climate change; extreme event; jet stream; polar vortex; stratosphere; subsidence; troposphere; warming
来源期刊Nature Geoscience
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/124575
作者单位Bureau of Meteorology, Melbourne, VIC, Australia; ARC Centre of Excellence for Climate Extremes, Monash University, Clayton, VIC, Australia; School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC, Australia; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; National Center for Atmospheric Research, Boulder, CO, United States
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Lim E.-P.,Hendon H.H.,Boschat G.,et al. Australian hot and dry extremes induced by weakenings of the stratospheric polar vortex[J],2019,12(11).
APA Lim E.-P..,Hendon H.H..,Boschat G..,Hudson D..,Thompson D.W.J..,...&Arblaster J.M..(2019).Australian hot and dry extremes induced by weakenings of the stratospheric polar vortex.Nature Geoscience,12(11).
MLA Lim E.-P.,et al."Australian hot and dry extremes induced by weakenings of the stratospheric polar vortex".Nature Geoscience 12.11(2019).
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