Arid
DOI10.1038/nature11377
Afternoon rain more likely over drier soils
Taylor, Christopher M.1; de Jeu, Richard A. M.2; Guichard, Francoise3,4; Harris, Phil P.1; Dorigo, Wouter A.5
通讯作者Taylor, Christopher M.
来源期刊NATURE
ISSN0028-0836
出版年2012
卷号489期号:7416页码:423-426
英文摘要

Land surface properties, such as vegetation cover and soil moisture, influence the partitioning of radiative energy between latent and sensible heat fluxes in daytime hours. During dry periods, soil-water deficit can limit evapotranspiration, leading to warmer and drier conditions in the lower atmosphere(1,2). Soil moisture can influence the development of convective storms through such modifications of low-level atmospheric temperature and humidity(1,3), which in turn feeds back on soil moisture. Yet there is considerable uncertainty in how soil moisture affects convective storms across the world, owing to a lack of observational evidence and uncertainty in large-scale models(4). Here we present a global-scale observational analysis of the coupling between soil moisture and precipitation. We show that across all six continents studied, afternoon rain falls preferentially over soils that are relatively dry compared to the surrounding area. The signal emerges most clearly in the observations over semi-arid regions, where surface fluxes are sensitive to soil moisture, and convective events are frequent. Mechanistically, our results are consistent with enhanced afternoon moist convection driven by increased sensible heat flux over drier soils, and/or mesoscale variability in soil moisture. We find no evidence in our analysis of a positive feedback-that is, a preference for rain over wetter soils-at the spatial scale (50-100 kilometres) studied. In contrast, we find that a positive feedback of soil moisture on simulated precipitation does dominate in six state-of-the-art global weather and climate models-a difference that may contribute to excessive simulated droughts in large-scale models.


类型Article
语种英语
国家England ; Netherlands ; France ; Austria
收录类别SCI-E
WOS记录号WOS:000308860900043
WOS关键词BOUNDARY LAYER INTERACTIONS ; PART II ; ATMOSPHERIC CONTROLS ; DIURNAL CYCLE ; UNITED-STATES ; MOISTURE ; PRECIPITATION ; LAND ; CONVECTION ; FEEDBACK
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174151
作者单位1.NERC Ctr Ecol & Hydrol, Wallingford OX10 8BB, Oxon, England;
2.Vrije Univ Amsterdam, Dept Earth Sci, Fac Earth & Life Sci, NL-1081 HV Amsterdam, Netherlands;
3.CNRM GAME CNRS, F-31057 Toulouse, France;
4.Meteo France, F-31057 Toulouse, France;
5.Vienna Univ Technol, Inst Photogrammetry & Remote Sensing IPF, A-1040 Vienna, Austria
推荐引用方式
GB/T 7714
Taylor, Christopher M.,de Jeu, Richard A. M.,Guichard, Francoise,et al. Afternoon rain more likely over drier soils[J],2012,489(7416):423-426.
APA Taylor, Christopher M.,de Jeu, Richard A. M.,Guichard, Francoise,Harris, Phil P.,&Dorigo, Wouter A..(2012).Afternoon rain more likely over drier soils.NATURE,489(7416),423-426.
MLA Taylor, Christopher M.,et al."Afternoon rain more likely over drier soils".NATURE 489.7416(2012):423-426.
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