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DOI | 10.1007/s00382-018-4489-4 |
The role of sea surface temperature in the atmospheric seasonal cycle of the equatorial Atlantic | |
Crespo, Lander R.1,2; Keenlyside, Noel1,2; Koseki, Shunya1,2 | |
2019-05-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52页码:5927-5946 |
文章类型 | Article |
语种 | 英语 |
国家 | Norway |
英文摘要 | We investigate the role of sea surface temperature (SST) and land surface temperature (LST) in driving the seasonal cycle of the atmosphere (surface winds and precipitation) in the tropical Atlantic. For this we compare three atmospheric general circulation model (AGCM) experiments for the historical period 1982-2013 forced by different SST: (1) observed daily-climatological SST, (2) globally annual-mean SST, and (3) annual-mean SST in the equatorial Atlantic and daily-climatological SST elsewhere. Seasonal variations in SST strongly influence the seasonal evolution of the West African Monsoon (WAM) and ITCZ over the equatorial Atlantic Ocean. Forcing the model with annual mean SST (globally and in the equatorial Atlantic) considerably reduces the seasonal variance in the atmosphere, except for the zonal winds in the eastern equatorial Atlantic. Equatorial Atlantic SST contributes to the seasonal cycle in precipitation and meridional winds over the entire equatorial Atlantic, but only strongly influences zonal winds in the western equatorial Atlantic and has little influence on the northward penetration of the WAM. The leading modes of coupled SST-LST-atmosphere co-variability are identified by multivariate analysis. The analysis shows that both LST and SST drive seasonal variations in precipitation over equatorial Atlantic, with the LST being a larger contributor to the continental rainfall in West Africa. The coupling between ocean and atmosphere is stronger in the western than in the eastern equatorial Atlantic. The pressure adjustment mechanism is the main driver of the surface meridional wind convergence in the eastern tropical Atlantic. |
英文关键词 | Equatorial Atlantic ITCZ WAM Seasonal cycle AGCM |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000465441400048 |
WOS关键词 | TROPICAL RESPONSE ; COLD-TONGUE ; MODEL ; MONSOON ; BIASES ; WINDS ; ITCZ |
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/182624 |
专题 | 气候变化 |
作者单位 | 1.Univ Bergen, Geophys Inst, Postboks 7803, N-5020 Bergen, Norway; 2.Bjerknes Ctr Climate Res, Postboks 7803, N-5020 Bergen, Norway |
推荐引用方式 GB/T 7714 | Crespo, Lander R.,Keenlyside, Noel,Koseki, Shunya. The role of sea surface temperature in the atmospheric seasonal cycle of the equatorial Atlantic[J]. CLIMATE DYNAMICS,2019,52:5927-5946. |
APA | Crespo, Lander R.,Keenlyside, Noel,&Koseki, Shunya.(2019).The role of sea surface temperature in the atmospheric seasonal cycle of the equatorial Atlantic.CLIMATE DYNAMICS,52,5927-5946. |
MLA | Crespo, Lander R.,et al."The role of sea surface temperature in the atmospheric seasonal cycle of the equatorial Atlantic".CLIMATE DYNAMICS 52(2019):5927-5946. |
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