Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-018-4563-y |
West African convection regimes and their predictability from submonthly forecasts | |
Vigaud, N.; Giannini, A. | |
2019-06-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52期号:11页码:7029-7048 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Recurrent convection regimes are identified during the extended West African Monsoon (WAM) season (May-Nov) using a k-means clustering of 1980-2013 NOAA daily Outgoing Longwave Radiation (OLR), and are well reproduced in 1996-2015 ECMWF week-1 reforecasts despite systematic biases. One regime of broad drying across the Sahel in the early (May-Jun) and late (Oct) WAM is of particular interest regarding the prediction of onset date. This regime is associated with an anticyclonic cell along the Atlantic coast of West Africa leading to a weakened monsoon flow and subsiding anomalies across the Sahel. Teleconnections of this regime with the Indian monsoon sector are identified through modulations of the Walker circulation alongside relationships to MJO phase 3 more than 10 days in advance, when convection is enhanced over the Indian Ocean. Other regimes are associated with westward propagating anomalous convective cells along two distinct wave trains at 15 degrees N and 24 degrees N during the core (Jul-Sep) and late (Oct-Nov) WAM, respectively, and translate into wet anomalies transiting across the Sahel. A regime of broad Sahel wetting in the core WAM, more frequent since the 1990s, is related to global SST warming, agreeing with the observed recovery of Sahel rainfall. ECMWF skill in forecasting regime sequences decreases from week-1 to -4 leads, except in the case of the above-mentioned regime associated with early season dry spells, translating into the potential for skillful WAM onset date predictions. Our analysis suggests that sources of predictability include relationships to the MJO and the Indian monsoon sector, which need to be further examined to benefit subseasonal forecasting efforts in West Africa, and ultimately agricultural planning and food security across the Sahel. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000469016700041 |
WOS关键词 | INTRASEASONAL VARIABILITY ; MONSOON DYNAMICS ; NORTH-ATLANTIC ; RAINFALL ; ONSET ; SEASON ; SHIFT |
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/183496 |
专题 | 气候变化 |
作者单位 | Columbia Univ, Int Res Inst Climate & Soc, Earth Inst, Palisades, NY 10964 USA |
推荐引用方式 GB/T 7714 | Vigaud, N.,Giannini, A.. West African convection regimes and their predictability from submonthly forecasts[J]. CLIMATE DYNAMICS,2019,52(11):7029-7048. |
APA | Vigaud, N.,&Giannini, A..(2019).West African convection regimes and their predictability from submonthly forecasts.CLIMATE DYNAMICS,52(11),7029-7048. |
MLA | Vigaud, N.,et al."West African convection regimes and their predictability from submonthly forecasts".CLIMATE DYNAMICS 52.11(2019):7029-7048. |
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