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DOI | 10.1038/s41561-017-0041-0 |
Role of polar anticyclones and mid-latitude cyclones for Arctic summertime sea-ice melting | |
Wernli, Heini1; Papritz, Lukas1,2,3 | |
2018-02-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:2页码:108-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; Norway |
英文摘要 | Annual minima in Arctic sea-ice extent and volume have been decreasing rapidly since the late 1970s, with substantial interannual variability. Summers with a particularly strong reduction of Arctic sea-ice extent are characterized by anticyclonic circulation anomalies from the surface to the upper troposphere. Here, we investigate the origin of these seasonal circulation anomalies by identifying individual Arctic anticyclones (with a lifetime of typically ten days) and analysing the air mass transport into these systems. We reveal that these episodic upper-level induced Arctic anticyclones are relevant for generating seasonal circulation anomalies. Sea-ice reduction is systematically enhanced during the transient episodes with Arctic anticyclones and the seasonal reduction of sea-ice volume correlates with the area-averaged frequency of Arctic anticyclones poleward of 70 degrees N (correlation coefficient of 0.57). A trajectory analysis shows that these anticyclones result from extratropical cyclones injecting extratropical air masses with low potential vorticity into the Arctic upper troposphere. Our results emphasize the fundamental role of extratropical cyclones and associated diabatic processes in establishing Arctic anticyclones and, in turn, seasonal circulation anomalies, which are of key importance for understanding the variability of summertime Arctic sea-ice melting. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423843600008 |
WOS关键词 | ATMOSPHERIC CIRCULATION ; PART I ; CLIMATOLOGY ; VARIABILITY ; BLOCKING ; AMPLIFICATION ; REANALYSIS ; GREENLAND ; PACIFIC ; WEATHER |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35175 |
专题 | 地球科学 气候变化 |
作者单位 | 1.ETH, Inst Atmospher & Climate Sci, Zurich, Switzerland; 2.Univ Bergen, Geophys Inst, Bergen, Norway; 3.Bjerknes Ctr Climate Res, Bergen, Norway |
推荐引用方式 GB/T 7714 | Wernli, Heini,Papritz, Lukas. Role of polar anticyclones and mid-latitude cyclones for Arctic summertime sea-ice melting[J]. NATURE GEOSCIENCE,2018,11(2):108-+. |
APA | Wernli, Heini,&Papritz, Lukas.(2018).Role of polar anticyclones and mid-latitude cyclones for Arctic summertime sea-ice melting.NATURE GEOSCIENCE,11(2),108-+. |
MLA | Wernli, Heini,et al."Role of polar anticyclones and mid-latitude cyclones for Arctic summertime sea-ice melting".NATURE GEOSCIENCE 11.2(2018):108-+. |
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