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Nat Clim Change:兰州大学田文寿教授课题组发表北极平流层研究成果

摘要 : 2016年8月8日,国际学术权威刊物自然出版集团旗下子刊、气候变化领域顶级期刊《Nature Climate Change》杂志在线发表了兰州大学大气科学学院田文寿教授等人的最新研究成果

 2016年8月8日,国际学术权威刊物自然出版集团旗下子刊、气候变化领域顶级期刊《Nature Climate Change》杂志在线发表了兰州大学大气科学学院田文寿教授等人的最新研究成果,论文题目为“Persistent Shift of the Arctic Polar Vortex towards the Eurasian Continent in Recent Decades”。第一作者为我校青年教师张健恺博士,博士期间师从田文寿教授,论文通讯作者为田文寿教授。

近些年来,北半球欧亚大陆、北美大陆冷冬事件频发,如2008年中国南方的雪灾、2011年欧洲极寒和2016年欧亚大陆出现的“boss”级寒潮,都不断挑战了人们对全球变暖的理解和认识。关于北半球冬季的天气气候预报是全球大气科学家所面临的难题。最近十来年的研究发现北极平流层极涡近些年强度逐渐减弱,冷空气不断从极区、高纬度向中纬度输送,诱发了近些年频发的冷冬事件。但是目前关于平流层极涡位置和形态的长期变化研究鲜有报道。

张健恺、田文寿教授等人的研究发现近30年冬末(2月)北极平流层极涡存在向欧亚大陆偏移的显著变化趋势,并认为北极地区尤其是巴伦支海-喀拉海地区的海冰减少和欧亚大陆积雪的增加是造成平流层极涡偏移的重要原因。他们的研究还进一步指出当平流层极涡向欧亚大陆发生偏移后,欧亚大陆部分地区,甚至北美部分地区的气温相比气候平均态而言异常偏冷。未来海冰面积仍持续减少,北极平流层极涡的位置变化以及其引起的北半球中高纬度天气气候变化值得密切关注。

原文链接:

Persistent shift of the Arctic polar vortex towards the Eurasian continent in recent decades

原文摘要:

The wintertime Arctic stratospheric polar vortex has weakened over the past three decades, and consequently cold surface air from high latitudes is now more likely to move into the middle latitudes1, 2, 3, 4, 5. However, it is not known if the location of the polar vortex has also experienced a persistent change in response to Arctic climate change and whether any changes in the vortex position have implications for the climate system. Here, through the analysis of various data sets and model simulations, we show that the Arctic polar vortex shifted persistently towards the Eurasian continent and away from North America in February over the past three decades. This shift is found to be closely related to the enhanced zonal wavenumber-1 waves in response to Arctic sea-ice loss, particularly over the Barents–Kara seas (BKS). Increased snow cover over the Eurasian continent may also have contributed to the shift. Our analysis reveals that the vortex shift induces cooling over some parts of the Eurasian continent and North America which partly offsets the tropospheric climate warming there in the past three decades. The potential vortex shift in response to persistent sea-ice loss in the future6, 7, and its associated climatic impact, deserve attention to better constrain future climate changes.

来源: Nature Climate Change 浏览次数:0

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