Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/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
![]() |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
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。 |
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。
修改评论