| How Does the Partitioning of Evapotranspiration and Runoff between Different Processes Affect the Variability and Predictability of Soil Moisture and Precipitation？ |
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| 作者姓名： | Robert E. DICKINSON Guiling WANG Xubin ZENG ZENG Qingcun |
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| 作者单位： | [1]GeorgiaInstituteofTechnology,AtlantaGA [2]UniversityofConnecticut,StorrsCT [3]UniversityofArizona,TucsonAZ [4]InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing,100080 |
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| 基金项目： | a grant from the US NSF ATM-0096099. |
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| 摘 要： | Water stored as part of the land surface is lost to evapotranspiration and runoff on different time scales,and the partitioning between these time scales is important for modeling soil water in a climate model.Different time scales are imposed on evapotranspiration primarily because it is derived from different reservoirs with different storage capacities, from the very rapid evaporation of canopy stores to the slow removal by transpiration of rooting zone soil moisture. Runoff likewise ranges in time scale from rapid surface terms to the slower base-flow. The longest time scale losses of water determine the slow variation of soil moisture and hence the longer time scale effects of soil moisture on precipitation. This paper shows with a simple analysis how shifting the partitioning of evapotranspiration between the different reservoirs affects the variability of soil moisture and precipitation. In particular, it is concluded that a shift to shorter time scale reservoirs shifts the variance of precipitation from that which is potentially predictable to unpredictable.
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| 关 键 词： | 土壤湿度 气候模型 土壤水分蒸发损失总量 陆地表面耦合 |
| 收稿时间： | 8 November 2002 |
How Does the Partitioning of Evapotranspiration and Runoff between Different Processes Affect the Variability and Predictability of Soil Moisture and Precipitation? |
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| Robert E. DICKINSON,Guiling WANG,Xubin ZENG,ZENG Qingcun.How Does the Partitioning of Evapotranspiration and Runoff between Different Processes Affect the Variability and Predictability of Soil Moisture and Precipitation?[J].Advances in Atmospheric Sciences,2003,20(3):475-478. |
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| Authors: | Robert E Dickinson Wang Gulling Zeng Xubin Zeng Qingcun |
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| Institution: | Georgia Institute of Technology, Atlanta GA,University of Connecticut, Storrs CT,University of Arizona, Tucson AZ,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100080 |
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| Abstract: | Water stored as part of the land surface is lost to evapotranspiration and runoff on different time scales,and the partitioning between these time scales is important for modeling soil water in a climate model.Different time scales are imposed on evapotranspiration primarily because it is derived from differentreservoirs with different storage capacities, from the very rapid evaporation of canopy stores to the slowremoval by transpiration of rooting zone soil moisture. Runoff likewise ranges in time scale from rapidsurface terms to the slower base-flow. The longest time scale losses of water determine the slow variationof soil moisture and hence the longer time scale effects of soil moisture on precipitation. This paper showswith a simple analysis how shifting the partitioning of evapotranspiration between the different reservoirsaffects the variability of soil moisture and precipitation. In particular, it is concluded that a shift toshorter time scale reservoirs shifts the variance of precipitation from that which is potentially predictableto unpredictable. |
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| Keywords: | evapotranspiration climate model land surface coupling |
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