DOI: 10.1007/s00382-011-1044-y
Scopus记录号: 2-s2.0-84855334371
论文题名: Climate links and recent extremes in antarctic sea ice, high-latitude cyclones, Southern Annular Mode and ENSO
作者: Pezza A.B. ; Rashid H.A. ; Simmonds I.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-01-02 起始页码: 57
结束页码: 73
语种: 英语
英文关键词: Antarctica
; Cyclones
; El Niño
; Mid-latitude storms
; Sea ice
; Southern Annular Mode
英文摘要: In this article, we study the climate link between the Southern Annular Mode (SAM) and the southern sea-ice extent (SIE), and discuss the possible role of stationary waves and synoptic eddies in establishing this link. In doing so, we have used a combination of techniques involving spatial correlations of SIE, eddy streamfunction and wind anomalies, and statistics of high-latitude cyclone strength. It is suggested that stationary waves may be amplified by eddy anomalies associated with high latitude cyclones, resulting in more sea ice when the SAM is in its positive phase for most, but not all, longitudes. A similar association is observed during ENSO (La Niña years). Although this synergy in the SAM/ENSO response may partially reflect preferential areas for wave amplification around Antarctica, the short extent of the climate records does not allow for a definite causality connection to be established with SIE. Stronger polar cyclones are observed over the areas where the stationary waves are amplified. These deeper cyclones will break up and export ice equatorward more efficiently, but the near-coastal regions are cold enough to allow for a rapid re-freeze of the resulting ice break-up. We speculate that if global warming continues this same effect could help reverse the current (positive) Antarctic SIE trends once the ice gets thinner, similarly to what has been observed in the Northern Hemisphere. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55396
Appears in Collections: 过去全球变化的重建
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作者单位: School of Earth Sciences, The University of Melbourne, Parkville, VIC 3010, Australia; Centre for Australian Weather and Climate Research, Private Bag 1, Melbourne, VIC 3195, Australia
Recommended Citation:
Pezza A.B.,Rashid H.A.,Simmonds I.. Climate links and recent extremes in antarctic sea ice, high-latitude cyclones, Southern Annular Mode and ENSO[J]. Climate Dynamics,2012-01-01,38(2017-01-02)