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DOI | 10.1007/s00382-018-4169-4 |
Ekman pumping mechanism driving precipitation anomalies in response to equatorial heating | |
Hamouda, Mostafa E.1,2; Kucharski, Fred2,3 | |
2019 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52页码:697-711 |
文章类型 | Article |
语种 | 英语 |
国家 | Egypt; Italy; Saudi Arabia |
英文摘要 | In this paper some basic mechanisms for rainfall teleconnections to a localized tropical sea surface temperature anomaly are re-visited using idealized AGCM aqua-planet simulations. The dynamical response is generally in good agreement with the Gill-Matsuno theory. The mechanisms analyzed are (1) the stabilization of the tropical troposphere outside the heating region, (2) the Walker circulation modification and (3) Ekman pumping induced by the low-level circulation responses. It is demonstrated that all three mechanisms, and in particular (2) and (3), contribute to the remote rainfall teleconnections. However, mechanism (3) best coincides with the overall horizontal structure of rainfall responses. It is shown by using the models boundary layer parameterization that low-level vertical velocities are indeed caused by Ekman pumping and that this induces vertical velocities in the whole tropospheric column through convective feedbacks. Also the modification of the responses due to the presence of idealized warm pools is investigated. It is shown that warm pools modify the speed of the tropical waves, consistent with Doppler shifts and are thus able to modify the Walker circulation adjustments and remote rainfall responses. The sensitivity of the responses, and in particular the importance of the Ekman pumping mechanism, to large variations in the drag coefficient is also tested, and it is shown that the Ekman pumping mechanism is robust for a wide range of values. |
英文关键词 | Ekman pumping Monsoon Rainfall Teleconnections |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000460619200040 |
WOS关键词 | SEA-SURFACE TEMPERATURES ; SUMMER MONSOON ; PHYSICAL PARAMETRIZATIONS ; TROPICAL PACIFIC ; INDIAN-OCEAN ; CLIMATE ; VARIABILITY ; TELECONNECTION ; SIMULATIONS ; RAINFALL |
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/35530 |
专题 | 气候变化 |
作者单位 | 1.Cairo Univ, Fac Sci, Astron & Meteorol Dept, Cairo, Egypt; 2.Abdus Salam Int Ctr Theoret Phys, Earth Syst Phys Sect, Trieste, Italy; 3.King Abdulaziz Univ, Dept Meteorol, Ctr Excellence Climate Change Res, Jeddah, Saudi Arabia |
推荐引用方式 GB/T 7714 | Hamouda, Mostafa E.,Kucharski, Fred. Ekman pumping mechanism driving precipitation anomalies in response to equatorial heating[J]. CLIMATE DYNAMICS,2019,52:697-711. |
APA | Hamouda, Mostafa E.,&Kucharski, Fred.(2019).Ekman pumping mechanism driving precipitation anomalies in response to equatorial heating.CLIMATE DYNAMICS,52,697-711. |
MLA | Hamouda, Mostafa E.,et al."Ekman pumping mechanism driving precipitation anomalies in response to equatorial heating".CLIMATE DYNAMICS 52(2019):697-711. |
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