| Global and Regional Impacts of Vegetation on the Hydrological Cycle and Energy Budget as Represented by the Community Atmosphere Model （CAM3） |
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| 作者姓名： | XU Zhongfeng ZENG Gang FU Congbin |
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| 作者单位： | 中国科学院大气物理研究所,, |
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| 基金项目： | This research is supported jointly by the National Basic Research Program of China （Grant No. 2006CB400502）, the Foundation of the Jiangsu Key Laboratory of Meteorological Disaster KLME0704, and the China Postdoctoral Science Foundation 20070410133. |
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| 摘 要： | The effects of vegetation and its seasonal variation on energy and the hydrological cycle were examined using a state-of-the-art Community Atmosphere Model （CAM3）. Three 15-year numerical experiments were completed： the first with realistic vegetation characteristics varying monthly （VEG run）, the second without vegetation over land （NOVEG run）, and the third with the vegetation characteristics held at their annual mean values （VEGMEAN run）. In these models, the hydrological cycle and land surface energy budget were widely affected by vegetation. Globaland annual-mean evapotranspiration significantly increased compared with the NOVEG by 11.8% in the VEG run run, while runoff decreased by 13.2% when the realistic vegetation is incorporated. Vegetation plays different roles in different regions. In tropical Asia, vegetation-induced cooling of the land surface plays a crucial role in decreasing tropical precipitation. In middle latitudes and the Amazon region, however, the vegetation-induced increase of evapotranspiration plays a more important role in increasing precipitation. The seasonal variation of vegetation also shows clear influences on the hydrological cycle and energy budget. In the boreal mid-high latitudes where vegetation shows a strong seasonal cycle, evapotranspiration and precipitation are higher in the summer in the VEG run than in the VEGMEAN run.
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| 关 键 词： | 植被特征 水文循环 能量收支 模型 环和 社区 夏季运行 季节变化 |
Global and regional impacts of vegetation on hydrological cycle and energy budget as represented by the Community Atmosphere Model (CAM3) |
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| XU Zhongfeng,ZENG Gang,FU Congbin.Global and regional impacts of vegetation on hydrological cycle and energy budget as represented by the Community Atmosphere Model (CAM3)[J].Atmospheric and Oceanic Science Letters,2009,2(2):85-90. |
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| Authors: | XU Zhongfeng ZENG Gang and FU Congbin |
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| Institution: | Institute of Atmospheric Physics, Chinese Academy of Sciences,Nanjing University of Information Science & Technology,Nanjing University |
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| Abstract: | The effects of vegetation and its seasonal variation on energy and the hydrological cycle were examined using a state-of-the-art Community Atmosphere Model (CAM3). Three 15-year numerical experiments were completed: the first with realistic vegetation characteristics varying monthly (VEG run), the second without vegetation over land (NOVEG run), and the third with the vegetation characteristics held at their annual mean values (VEGMEAN run). In these models, the hydrological cycle and land surface energy budget were widely affected by vegetation. Global- and annual-mean evapotranspiration significantly increased by 11.8% in the VEG run compared with the NOVEG run, while runoff decreased by 13.2% when the realistic vegetation is incorporated. Vegetation plays different roles in different regions. In tropical Asia, vegetation-induced cooling of the land surface plays a crucial role in decreasing tropical precipitation. In middle latitudes and the Amazon region, however, the vegetation-induced increase of evapotranspiration plays a more important role in increasing precipitation. The seasonal variation of vegetation also shows clear influences on the hydrological cycle and energy budget. In the boreal mid-high latitudes where vegetation shows a strong seasonal cycle, evapotranspiration and precipitation are higher in the summer in the VEG run than in the VEGMEAN run. |
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| Keywords: | vegetation seasonal variation hydrological cycle energy budget regional climate |
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