DOI: 10.1002/2017JD027435
Scopus记录号: 2-s2.0-85041036050
论文题名: Autumn Cooling of Western East Antarctica Linked to the Tropical Pacific
作者: Clem K.R. ; Renwick J.A. ; McGregor J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 1 起始页码: 89
结束页码: 107
语种: 英语
英文关键词: climate
; East Antarctica
; ENSO
; Rossby waves
; SAM
; teleconnection
Scopus关键词: air-sea interaction
; anticyclone
; atmospheric circulation
; autumn
; climate change
; cooling
; El Nino-Southern Oscillation
; La Nina
; Rossby wave
; sea ice
; Southern Hemisphere
; teleconnection
; westerly
; Antarctica
; Atlantic Ocean
; Atlantic Ocean (South)
; East Antarctica
; Pacific Ocean
; Pacific Ocean (Tropical)
; West Antarctica
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 Niña events. The recent increase in La Niña 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 Niño–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. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114692
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Earth, Ocean, and Atmospheric Sciences, Rutgers, the State University of New Jersey, New Brunswick, NJ, United States; School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand
Recommended Citation:
Clem K.R.,Renwick J.A.,McGregor J.. Autumn Cooling of Western East Antarctica Linked to the Tropical Pacific[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(1)