气候变化领域集成服务门户(CCPortal): Regional co-variability of spatial and temporal soil moisture-precipitation coupling in North Africa: An observational perspective

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DOI	10.5194/hess-22-3275-2018
	Regional co-variability of spatial and temporal soil moisture-precipitation coupling in North Africa: An observational perspective
	Petrova I.Y.; Van Heerwaarden C.C.; Hohenegger C.; Guichard F.
发表日期	2018
ISSN	1027-5606
起始页码	3275
结束页码	3294
卷号	22 期号:6
英文摘要	The magnitude and sign of soil moisture-precipitation coupling (SMPC) is investigated using a probability-based approach and 10 years of daily microwave satellite data across North Africa at a 1° horizontal scale. Specifically, the co-existence and co-variability of spatial (i.e. using soil moisture gradients) and temporal (i.e. using soil moisture anomaly) soil moisture effects on afternoon rainfall is explored. The analysis shows that in the semi-arid environment of the Sahel, the negative spatial and the negative temporal coupling relationships do not only co-exist, but are also dependent on one another. Hence, if afternoon rain falls over temporally drier soils, it is likely to be surrounded by a wetter environment. Two regions are identified as SMPC "hot spots". These are the south-western part of the domain (7-15° N, 10° W-7° E), with the most robust negative SMPC signal, and the South Sudanese region (5-13° N, 24-34° E). The sign and significance of the coupling in the latter region is found to be largely modulated by the presence of wetlands and is susceptible to the number of long-lived propagating convective systems. The presence of wetlands and an irrigated land area is found to account for about 30 % of strong and significant spatial SMPC in the North African domain. This study provides the first insight into regional variability of SMPC in North Africa, and supports the potential relevance of mechanisms associated with enhanced sensible heat flux and mesoscale variability in surface soil moisture for deep convection development. © Author(s) 2018.
语种	英语
scopus关键词	Heat flux; Rain; Wetlands; Convective systems; Mesoscale variability; Microwave satellite data; Regional variability; Semi-arid environments; Sensible heat flux; Soil-moisture effects; Surface soil moisture; Soil moisture; observational method; rainfall; satellite data; semiarid region; sensible heat flux; spatial variation; temporal variation; wetland; North Africa; Sahel [Sub-Saharan Africa]; Sudan
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160001
作者单位	Petrova, I.Y., Department of the Land in the Earth System, Max Planck Institute for Meteorology, Hamburg, Germany, Laboratory of Hydrology and Water Management, Ghent University, Ghent, Belgium; Van Heerwaarden, C.C., Meteorology and Air Quality Group, Wageningen University, Wageningen, Netherlands; Hohenegger, C., Department of the Land in the Earth System, Max Planck Institute for Meteorology, Hamburg, Germany; Guichard, F., CNRM (UMR 3589 CNRS and Météo-France), Toulouse, France
推荐引用方式 GB/T 7714	Petrova I.Y.,Van Heerwaarden C.C.,Hohenegger C.,et al. Regional co-variability of spatial and temporal soil moisture-precipitation coupling in North Africa: An observational perspective[J],2018,22(6).
APA	Petrova I.Y.,Van Heerwaarden C.C.,Hohenegger C.,&Guichard F..(2018).Regional co-variability of spatial and temporal soil moisture-precipitation coupling in North Africa: An observational perspective.Hydrology and Earth System Sciences,22(6).
MLA	Petrova I.Y.,et al."Regional co-variability of spatial and temporal soil moisture-precipitation coupling in North Africa: An observational perspective".Hydrology and Earth System Sciences 22.6(2018).