Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0451.1 |
The Impact of Tropical Precipitation on Summertime Euro-Atlantic Circulation via a Circumglobal Wave Train | |
O&1; 39;Reilly, Christopher H.2 | |
2018-08-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:16页码:6481-6504 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | The influence of tropical precipitation variability on summertime seasonal circulation anomalies in the Euro-Atlantic sector is investigated. The dominant mode of the maximum covariance analysis (MCA) between the Euro-Atlantic circulation and tropical precipitation reveals a cyclonic anomaly over the extratropical North Atlantic, contributing to anomalously wet conditions over western Europe and dry conditions over eastern Europe and Scandinavia (in the positive phase). The related mode of tropical precipitation variability is associated with tropical Pacific SST anomalies and is closely linked to the El Nino-Southern Oscillation (ENSO). The second MCA mode consists of weaker tropical precipitation anomalies but with a stronger extratropical signal that reflects internal atmospheric variability. The teleconnection mechanism is tested in barotropic model simulations, which indicate that the observed link between the dominant mode of tropical precipitation and the Euro-Atlantic circulation anomalies is largely consistent with linear Rossby wave dynamics. The barotropic model response consists of a circumglobal wave train in the extratropics that is primarily forced by divergence anomalies in the eastern tropical Pacific. Both the eastward and westward group propagation of the Rossby waves are found to be important in determining the circulation response over the Euro-Atlantic sector. The mechanism was also analyzed in an operational seasonal forecasting system, ECMWF's System 4. While System 4 is well able to reproduce and skillfully forecast the tropical precipitation, the extratropical circulation response is absent over the Euro-Atlantic region, which is likely related to biases in the Asian jet stream. |
英文关键词 | Atmosphere-ocean interaction Atmospheric circulation Rossby waves Teleconnections Diabatic heating Rainfall |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438704200004 |
WOS关键词 | MULTIDECADAL OSCILLATION ; GLOBAL PRECIPITATION ; NORTH-AMERICAN ; ENSO ; PROPAGATION ; CLIMATE ; TELECONNECTIONS ; VARIABILITY ; ATMOSPHERE ; PATTERNS |
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/20665 |
专题 | 气候变化 |
作者单位 | 1.Univ Oxford, Dept Phys, Atmospher Ocean & Planetary Phys, Oxford, England; 2.Univ Oxford, European Ctr Medium Range Weather Forecasts, Oxford, England; 3.Univ Oxford, Natl Ctr Atmospher Sci, Dept Phys, Oxford, England |
推荐引用方式 GB/T 7714 | O&,39;Reilly, Christopher H.. The Impact of Tropical Precipitation on Summertime Euro-Atlantic Circulation via a Circumglobal Wave Train[J]. JOURNAL OF CLIMATE,2018,31(16):6481-6504. |
APA | O&,&39;Reilly, Christopher H..(2018).The Impact of Tropical Precipitation on Summertime Euro-Atlantic Circulation via a Circumglobal Wave Train.JOURNAL OF CLIMATE,31(16),6481-6504. |
MLA | O&,et al."The Impact of Tropical Precipitation on Summertime Euro-Atlantic Circulation via a Circumglobal Wave Train".JOURNAL OF CLIMATE 31.16(2018):6481-6504. |
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