CLM4.5冠层截留方案的敏感性试验与改进
投稿时间: 2018-03-13  最后修改时间: 2018-03-18  点此下载全文
引用本文:
摘要点击次数: 373
全文下载次数: 
作者单位E-mail
穆梦圆 南京信息工程大学 大气科学学院  
陈海山 南京信息工程大学大气科学学院 haishan@nuist.edu.cn 
尹伊 中国人民解放军94926部队  
朱司光 南京信息工程大学 大气科学学院  
李兴 南京信息工程大学 大气科学学院  
孙善磊 南京信息工程大学水文与水资源工程学院  
中文摘要:植被冠层截留是植被参与水循环的重要方式之一。利用NCAR CAM-CLM陆气耦合模式,探讨了气候模拟对冠层截留和冠层最大承载水量参数的敏感性,探讨了植被冠层截留过程对全球和区域陆面蒸散发、降水、径流和2m气温的可能影响,揭示了冠层截留与植被光合作用之间的潜在联系。进一步使用采用GLEAM v3.0a陆面蒸散发和冠层蒸发数据评估CLM4.5冠层截留方案,结果显示CLM4.5高估了低茎叶面积指数植被的冠层蒸发,而低估了高茎叶面积指数植被的冠层蒸发。在此基础上上,在CLM4.5中引入了可以从理论上校正模拟偏差的冠层截留改进方案,一定程度上改善了模式对全球森林覆盖区的冠层蒸发和陆面蒸散发的模拟能力。
中文关键词:冠层蒸发,陆面蒸散发,水文气候效应,CLM4.5
 
Sensitivity study and improvement of canopy interception scheme in CLM4.5
Abstract:Canopy interception is an important way for vegetation to participate in the hydrological processes. In this study, NCAR CAM-CLM coupled model has been used to investigate sensitivities of climate simulation to changes in canopy interception input and canopy storage capacity. We evaluated possible impacts of canopy interception on evapotranspiration, precipitation, runoff and 2m temperature on both global and regional scales. Meantime, the potential relationship between canopy interception and vegetation photosynthesis has been disclosed. Furthermore, using GLEAM v3.0a evapotranspiration and canopy evaporation datasets, we evaluated the original canopy interception scheme in the CLM4.5. Results show that CLM4.5 overestimates the canopy evaporation of low PAI (plant area index) vegetation but underestimates the canopy evaporation of high PAI vegetation. An improved canopy interception scheme, which can theoretically correct the simulated bias, was induced into the CLM4.5. The new canopy interception scheme improves the simulation quality of canopy evaporation and evapotranspiration of global forest areas.
keywords:Canopy evaporation  Evapotranspiration  Hydrological and climatic effects  CLM4.5
查看全文  查看/发表评论  下载PDF阅读器