Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-16-0432.1 |
Characterization of Heat Waves in the Sahel and Associated Physical Mechanisms | |
Oueslati, Boutheina1; Pohl, Benjamin1; Moron, Vincent2,3; Rome, Sandra4; Janicot, Serge5 | |
2017-05-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | France; USA |
英文摘要 | Great effort is made to address heat waves (HWs) in developed countries because of their devastating impacts on society, economy, and environment. However, HWs are still understudied over developing countries. This is particularly true in West Africa, and especially in the Sahel, where temperatures recurrently reach critical values, such as during the 2010 HW event in the western Sahel. This work aims at characterizing the Sahelian HWs during boreal spring seasons (April-May-June) and understanding the mechanisms associated with such extreme events. Over the last three decades, Sahelian HWs have been becoming more frequent, lasting longer, covering larger areas, and reaching higher intensities. The physical mechanisms associated with HWs are examined to assess the respective roles of atmospheric dynamics and radiative and turbulent fluxes by analyzing the surface energy budget. Results suggest that the greenhouse effect of water vapor is the main driver of HWs in the western Sahel, increasing minimum temperatures by enhanced downward longwave radiation. Atmospheric circulation plays an important role in sustaining these warm anomalies by advecting moisture from the Atlantic Ocean and the Guinean coasts into the Sahel. Maximum temperature anomalies are mostly explained by increased downward shortwave radiation due to a reduction in cloud cover. Interannual variability of HWs is affected by the delayed impact of El Nio-Southern Oscillation (ENSO), with anomalous temperature warming following warm ENSO events, resulting from an amplified water vapor feedback. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000399680500002 |
WOS关键词 | EUROPEAN CLIMATE ; AUTUMN 2006 ; TEMPERATURE ; FUTURE ; EXTREMES ; IMPACT |
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/20062 |
专题 | 气候变化 |
作者单位 | 1.Univ Bourgogne, CNRS, UMR Biogeosci 6282, Ctr Rech Climatol, Dijon, France; 2.Univ Aix Marseille, CNRS, UM 34, CEREGE, Aix En Provence, France; 3.Columbia Univ, Palisades, NY USA; 4.Univ Grenoble Alpes, LTHE UMR 5564, Grenoble, France; 5.Sorbonne Univ, LOCEAN, UPMC IRD MNHN, UMR 7159, Paris, France |
推荐引用方式 GB/T 7714 | Oueslati, Boutheina,Pohl, Benjamin,Moron, Vincent,et al. Characterization of Heat Waves in the Sahel and Associated Physical Mechanisms[J]. JOURNAL OF CLIMATE,2017,30(9). |
APA | Oueslati, Boutheina,Pohl, Benjamin,Moron, Vincent,Rome, Sandra,&Janicot, Serge.(2017).Characterization of Heat Waves in the Sahel and Associated Physical Mechanisms.JOURNAL OF CLIMATE,30(9). |
MLA | Oueslati, Boutheina,et al."Characterization of Heat Waves in the Sahel and Associated Physical Mechanisms".JOURNAL OF CLIMATE 30.9(2017). |
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