A Soil Moisture-Rainfall Feedback Mechanism: 1. Theory and observations
نویسندگان
چکیده
منابع مشابه
A soil moisture–rainfall feedback mechanism 1. Theory and observations
This paper presents a hypothesis regarding the fundamental role of soil moisture conditions in land-atmosphere interactions. We propose that wet soil moisture conditions over any large region should be associated with relatively large boundary layer moist static energy, which favors the occurrence of more rainfall. Since soil moisture conditions themselves reflect past occurrence of rainfall, t...
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Here we develop a numerical model to investigate the hypothesis proposed by a companion paper [Eltahir, this issue], which describes a soil moisture–rainfall feedback mechanism. The model is designed to describe the seasonal evolution of the West African monsoon rainfall and is used to perform numerical experiments that elucidate the mechanisms of the response of rainfall to soil moisture anoma...
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Many global and regional climate modeling studies have demonstrated the importance of the initial soil water condition in their simulations of regional rainfall distribution. However, none of these modeling studies has been tested against directly observed data. This study tests the hypothesis that soil saturation is positively correlated with subsequent precipitation by analyzing a 14-year soi...
متن کاملSpace-time self-organization of mesoscale rainfall and soil moisture
The eects of mesoscale circulations induced by soil moisture heterogeneities are studied to assess the impact that the coupling of the land surface and the planetary boundary layer has on the rainfall and soil moisture dynamics at dierent scales. Our goal is to single out the most important physical mechanisms which aect the behaviour of the land-atmosphere system at the mesoscale leading to...
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Soil moisture impacts on precipitation have been strongly debated. Recent observational evidence of afternoon rain falling preferentially over land parcels that are drier than the surrounding areas (negative spatial effect), contrasts with previous reports of a predominant positive temporal effect. However, whether spatial effects relating to soil moisture heterogeneity translate into similar t...
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ژورنال
عنوان ژورنال: Water Resources Research
سال: 1998
ISSN: 0043-1397
DOI: 10.1029/97wr03499