Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1038/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
![]() |
ISSN | 0028-0836 |
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. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。