Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017JD027435 |
Autumn Cooling of Western East Antarctica Linked to the Tropical Pacific | |
Clem, Kyle R.1; Renwick, James A.2; McGregor, James2 | |
2018-01-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:1页码:89-107 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; New Zealand |
英文摘要 | Over the past 60 years, the climate of East Antarctica cooled while portions of West Antarctica were among the most rapidly warming regions on the planet. The East Antarctic cooling is attributed to a positive trend in the Southern Annular Mode (SAM) and a strengthening of the westerlies, while West Antarctic warming is tied to zonally asymmetric circulation changes forced by the tropics. This study finds recent (post-1979) surface cooling of East Antarctica during austral autumn to also be tied to tropical forcing, namely, an increase in La Nina events. The recent increase in La Nina conditions forces a Rossby wave into the Southern Hemisphere that increases anticyclonic circulation over the South Atlantic. The South Atlantic anticyclone is associated with cold air advection, weakened northerlies, and increased sea ice concentrations across the western East Antarctic coast, which has increased the rate of cooling at Novolazarevskaya and Syowa stations after 1979. This enhanced cooling over western East Antarctica is tied more broadly to a zonally asymmetric temperature trend pattern across East Antarctica during autumn that is consistent with a tropically forced Rossby wave rather than a SAM pattern; the positive SAM pattern is associated with ubiquitous cooling across East Antarctica, which is not seen in temperature observations after 1979. We conclude that El Nino-Southern Oscillation-related circulation anomalies, particularly zonal asymmetries that locally enhance meridional wind, are an important component of East Antarctic climate variability during autumn, and future changes in tropical Pacific climate will likely have implications for East Antarctica. |
英文关键词 | ENSO SAM East Antarctica climate Rossby waves teleconnection |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423433500006 |
WOS关键词 | SOUTHERN ANNULAR MODE ; ICE SHELVES ; EXTRATROPICAL CIRCULATION ; AMERICAN MODES ; CLIMATE-CHANGE ; HEMISPHERE ; SURFACE ; PENINSULA ; OSCILLATION ; VARIABILITY |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
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/32174 |
专题 | 气候变化 |
作者单位 | 1.Rutgers State Univ, Inst Earth Ocean & Atmospher Sci, New Brunswick, NJ 08901 USA; 2.Victoria Univ Wellington, Sch Geog Environm & Earth Sci, Wellington, New Zealand |
推荐引用方式 GB/T 7714 | Clem, Kyle R.,Renwick, James A.,McGregor, James. Autumn Cooling of Western East Antarctica Linked to the Tropical Pacific[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(1):89-107. |
APA | Clem, Kyle R.,Renwick, James A.,&McGregor, James.(2018).Autumn Cooling of Western East Antarctica Linked to the Tropical Pacific.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(1),89-107. |
MLA | Clem, Kyle R.,et al."Autumn Cooling of Western East Antarctica Linked to the Tropical Pacific".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.1(2018):89-107. |
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