GSTDTAP  > 气候变化
DOI10.1175/JCLI-D-18-0813.1
On the Seasonality of the El Nino Teleconnection to the Amundsen Sea Region
Yiu, Yu Yeung Scott1; Maycock, Amanda C.1,2
2019-08-01
发表期刊JOURNAL OF CLIMATE
ISSN0894-8755
EISSN1520-0442
出版年2019
卷号32期号:15页码:4829-4845
文章类型Article
语种英语
国家England
英文摘要

The Amundsen Sea low (ASL) is a quasi-stationary low pressure system that affects climate in West Antarctica. Previous studies have shown that El Nino-Southern Oscillation (ENSO) modulates the position and strength of the ASL with the strongest teleconnection found in austral winter despite the amplitude of ENSO events generally being largest in austral autumn/summer. This study investigates the mechanisms behind the seasonality of the El Nino teleconnection to the Amundsen Sea region (ASR) using experiments with the HadGEM3 climate model forced with an idealized fixed El Nino sea surface temperature anomaly present throughout the year. The seasonality of the El Nino-ASR teleconnection is found to originate from seasonal differences in the large-scale zonal winds in the South Pacific sector. In austral winter, the region of strong absolute vorticity near similar to 30 degrees S associated with the subtropical jet, in combination with the changes to upper-tropospheric divergence due to the El Nino perturbation, acts as an anomalous Rossby wave source that is largely absent in austral summer. Furthermore, in austral summer the poleward propagation of tropically sourced Rossby waves into the ASR is inhibited by the strong polar front jet in the South Pacific sector, which leads to Rossby wave reflection away from the ASR. In austral winter, Rossby waves are able to propagate into the ASR, forming part of the Pacific South America pattern. The lack of the Rossby wave source in the tropical Pacific and the absence of favorable conditions for wave propagation explains the weaker El Nino-ASR teleconnection in austral summer compared to austral winter.


英文关键词Antarctica El Nino Rossby waves Teleconnections El Nino Seasonal cycle
领域气候变化
收录类别SCI-E
WOS记录号WOS:000475369300001
WOS关键词SOUTHERN ANNULAR MODE ; ZONAL FLOW FEEDBACK ; HEMISPHERE WINTER ; WAVE-PROPAGATION ; ENSO ; CLIMATE ; CIRCULATION ; OSCILLATION ; VARIABILITY ; ATMOSPHERE
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/185717
专题气候变化
作者单位1.Univ Cambridge, Dept Chem, Ctr Atmospher Sci, Cambridge, England;
2.Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England
推荐引用方式
GB/T 7714
Yiu, Yu Yeung Scott,Maycock, Amanda C.. On the Seasonality of the El Nino Teleconnection to the Amundsen Sea Region[J]. JOURNAL OF CLIMATE,2019,32(15):4829-4845.
APA Yiu, Yu Yeung Scott,&Maycock, Amanda C..(2019).On the Seasonality of the El Nino Teleconnection to the Amundsen Sea Region.JOURNAL OF CLIMATE,32(15),4829-4845.
MLA Yiu, Yu Yeung Scott,et al."On the Seasonality of the El Nino Teleconnection to the Amundsen Sea Region".JOURNAL OF CLIMATE 32.15(2019):4829-4845.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Yiu, Yu Yeung Scott]的文章
[Maycock, Amanda C.]的文章
百度学术
百度学术中相似的文章
[Yiu, Yu Yeung Scott]的文章
[Maycock, Amanda C.]的文章
必应学术
必应学术中相似的文章
[Yiu, Yu Yeung Scott]的文章
[Maycock, Amanda C.]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。