DOI: 10.5194/hess-22-3275-2018
论文题名: Regional co-variability of spatial and temporal soil moisture-precipitation coupling in North Africa: An observational perspective
作者: Petrova I.Y. ; Van Heerwaarden C.C. ; Hohenegger C. ; Guichard F.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2018
卷: 22, 期: 6 起始页码: 3275
结束页码: 3294
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163284
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Hydrology and Earth System Sciences,2018-01-01,22(6)