气候变化领域集成服务门户(CCPortal): Characteristics and thermodynamics of Sahelian heatwaves analysed using various thermal indices

CCPortal

DOI	10.1007/s00382-020-05438-5
	Characteristics and thermodynamics of Sahelian heatwaves analysed using various thermal indices
	Guigma K.H.; Todd M.; Wang Y.
发表日期	2020
ISSN	0930-7575
起始页码	3151
结束页码	3175
卷号	55
英文摘要	Prolonged periods of extreme heat also known as heatwaves are a growing concern in a changing climate. Over the Sahel, a hot and semi-arid region in West Africa, they are still relatively poorly understood and managed. In this research, five multivariate thermal indices derived from the ERA5 database were used to characterize Sahelian heatwaves for statistical analysis and as a sampling basis to investigate their underlying thermodynamic causes. Results show that on average most locations in the Sahel suffer from one or two heatwaves a year lasting 3–5 days but with severe magnitude. The eastern Sahel is more at risk than the west, experiencing more frequent and longer lasting events. Despite similar statistics of intensity, duration and frequency across the heatwave indices, for a given diurnal phase, there is surprisingly low agreement in the timing of events. Furthermore daytime and nighttime heatwaves have little synchronicity. In terms of associated thermodynamic processes, heat advection and the greenhouse effect of moisture are identified as the main causes of Sahelian heatwaves. The processes are nevertheless sensitive to the indices, consequence of the distinctness of their respective samples. Therefore attention should be given to the choice of either index in operational monitoring and forecasting of heatwaves. This will allow to effectively target different exposed socio-economic groups and resultantly enhance the efficiency of early warning systems. © 2020, The Author(s).
英文关键词	Heatwaves; Sahel; Simultaneousness; Thermal indices; Thermodynamic processes
语种	英语
scopus关键词	climate change; extreme event; heat wave; multivariate analysis; semiarid region; synchrony; thermodynamics; Sahel [Sub-Saharan Africa]
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145258
作者单位	University of Sussex, Brighton, United Kingdom
推荐引用方式 GB/T 7714	Guigma K.H.,Todd M.,Wang Y.. Characteristics and thermodynamics of Sahelian heatwaves analysed using various thermal indices[J],2020,55.
APA	Guigma K.H.,Todd M.,&Wang Y..(2020).Characteristics and thermodynamics of Sahelian heatwaves analysed using various thermal indices.Climate Dynamics,55.
MLA	Guigma K.H.,et al."Characteristics and thermodynamics of Sahelian heatwaves analysed using various thermal indices".Climate Dynamics 55(2020).