| Estimation of annual actual evapotranspiration from nonsaturated land surfaces with conventional meteorological data |
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| 作者姓名： | QIU Xinfa ZENG Yan MIAO Qilong & YU Qiang . |
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| 作者单位： | QIU Xinfa1，ZENG Yan2，MIAO Qilong1 & YU Qiang2 1. Department of Geography，Nanjing Institute of Meteorology，Nanjing 210044，China; 2. Institute of Geographic Sciences and Natural Resources Research，Chinese Academy of Sciences，Beijing 100101，China |
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| 摘 要： | Land surface evapotranspiration is an important component both in earth surface heat and water bal-ance, on whose budgets weather and climate depend, to a great extent, for their changes are responsible for the formation and variation of vegetation features on the globe. Besides, the evapotranspiration is an im-portant topic of short-term flood forecasting and the estimation of runoff from mountainous sides. As a result, the problem as to the evapotranspiration has been one of the concerns in …
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Estimation of annual actual evapotranspiration from nonsaturated land surfaces with conventional meteorological data |
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| QIU Xinfa,ZENG Yan,MIAO Qilong & YU Qiang ..Estimation of annual actual evapotranspiration from nonsaturated land surfaces with conventional meteorological data[J].Science in China(Earth Sciences),2004,47(3). |
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| Authors: | Qiu Xinfa ZENG Yan Miao Qilong YU Qiang |
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| Institution: | 1. Department of Geography, Nanjing Institute of Meteorology, Nanjing,210044, China
2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing,100101, China |
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| Abstract: | Views diverge greatly on the relationship between actual evapotranspiration (AE) and potential evapotranspiration (PE). Penman showed that AE is determined in intensity by PE and changes proportionally as a function of PE. In contrast, Bouchet indicated that AE determines PE and varies inversely with PE. Based on nearly 30 years data from 432 weather stations and 512 hydrological stations in China, the two different theories, Penman's assumption and Bouchet's complementary relationship between AE and PE, were tested on nine river basins. With data integration technique, the complementary relationship between AE and PE was displayed entirely. A general model to estimate the actual evapotranspiration from nonsaturated surfaces by routine meteorological observations has been established on the basis of thorough analysis of the concept of PE. The results show that the calculations are all in error control of <10%, except for a few years over the Yellow River Basin. |
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| Keywords: | complementary relationship of evapotranspiration potential evapotranspiration actual evapotranspiration |
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