Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.atmosres.2018.04.026 |
Return times and return levels of July-September extreme rainfall over the major climatic sub-regions in Sahel | |
Chamani, Romeo1,2; Monkam, David1,3; Djomou, Z. Yepdo4 | |
2018-11-01 | |
发表期刊 | ATMOSPHERIC RESEARCH |
ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2018 |
卷号 | 212页码:77-90 |
文章类型 | Article |
语种 | 英语 |
国家 | Cameroon |
英文摘要 | Return times (RTs) and return levels (RLs) of July-September (JAS) extreme rainfall are estimated using stationary peaks-over-threshold approach through generalized pareto distribution (GPD) over the three climatic sub-regions in Sahel. Monthly rainfall data from the Climatic Research Unit were used. The period of analysis goes from 1901 to 2009. Results computed for both accumulated JAS rainfall and fractional area of extreme rainfall, indicate that JAS extreme rainfall in semiarid and sub-humid sub-regions were more frequent in the postchange period of 1971-2009 than in the prechange period of 1901-1970. The RLs of these extremes have greatly decreased after 1970. The changes at JAS extreme tails of the distribution have significantly contributed to the decrease in mean of JAS rainfall after 1970. Predicted 40-year RL shows that over each sub-region, JAS extreme rainfall are expected to be more severe after the postchange period. For the postchange period, 1999 has been detected as the most extreme year in arid and semiarid sub-regions, and 2008 in sub-humid sub-region. These events were found occurred during the manifestation of moderate La Nina. The spatial distributions of accumulated JAS rainfall associated with these years show that highest values were concentrated along the coastline of semiarid and sub-humid sub-regions, and the lowest values in the northern part of the arid subregion. Using the GPD, the JAS extreme rainfall (fractional area) associated with 1999 and 2008 are expected at least once every 144 (40), 99 (17) and 197 (67) yr in arid, semi-arid and sub-humid sub-regions, respectively. These results highlight the importance of an analysis of extreme rainfall in Sahel based on climatic sub-regions. |
英文关键词 | Sahel Extreme rainfall Fractional area Peaks-over-threshold Return times Return levels |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000439403300008 |
WOS关键词 | VARIABILITY ; TRENDS |
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/15212 |
专题 | 地球科学 |
作者单位 | 1.Univ Douala, Lab Fundamental Phys, Fac Sci, POB 24157, Douala, Cameroon; 2.Univ Yaounde I, Fac Sci, Dept Phys, POB 812, Yaounde, Cameroon; 3.Univ Douala, Dept Phys, Fac Sci, POB 24157, Douala, Cameroon; 4.Natl Inst Cartog, POB 157, Yaounde, Cameroon |
推荐引用方式 GB/T 7714 | Chamani, Romeo,Monkam, David,Djomou, Z. Yepdo. Return times and return levels of July-September extreme rainfall over the major climatic sub-regions in Sahel[J]. ATMOSPHERIC RESEARCH,2018,212:77-90. |
APA | Chamani, Romeo,Monkam, David,&Djomou, Z. Yepdo.(2018).Return times and return levels of July-September extreme rainfall over the major climatic sub-regions in Sahel.ATMOSPHERIC RESEARCH,212,77-90. |
MLA | Chamani, Romeo,et al."Return times and return levels of July-September extreme rainfall over the major climatic sub-regions in Sahel".ATMOSPHERIC RESEARCH 212(2018):77-90. |
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