摘要
为探究陆气系统对于冠层截留过程敏的感性,研究基于NCAR CAM-CLM陆气耦合模式探讨了截留参数对于全球陆地蒸发、降水、径流及气温的可能影响,揭示了冠层截留与植被光合作用之间的潜在联系。通过GLEAMv3.0a陆面蒸散发数据评估了CLM4.5冠层截留方案,并指出该方案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CLM4.5中引入冠层截留偏差校正方案则可在一定程度上提高了全球林区冠层蒸发和陆面蒸散发的模拟能力。
As an essential component of land evapotranspiration,canopy interception directly participates in the terrestrial w ater cycle.How ever,the significance of canopy interception on the global climate has long been underestimated.In this study,in order to explore the canopy interception's hydroclimatological effects,w e examine the sensitivity of NCAR CAM-CLM coupled model to the changes of precipitation interception input parameter and canopy storage capacity parameter.The study results articulate the fact that the variations of interception can affect the land hydrology process and global climate.The canopy interception's modification alters the amount and portioning of global evapotranspiration,runoff,and 2 m temperature.The precipitation distributions betw een tropical land and ocean,and over mid-high latitude forests,are regulated by the interception-induce atmospheric circulation adjustment.We also indicate a potential link betw een canopy interception and vegetation photosynthesis,w hich varies w ith vegetation types.Upon comparing CLM 4. 5 simulations w ith GLEAM v3. 0 a data,the model canopy interception scheme overestimates the low PAI forest's canopy evaporation and underestimates the high PAI forest's,w hich in part lead to the bias of simulated evapotranspiration.Consequently,w e induce a logic-curve interception equation into CLM 4. 5 and ameliorate the simulations of canopy evaporation and evapotranspiration over forests on the global scale.The new interception scheme reduces approximately 2%—5% of the evapotranspiration bias over Africa,the islands of Southeast Asia,the Indo-China Peninsula,eastern North America,and part of South America.It also low ers the canopy evaporation bias by 5%—30% over the forests in Africa,Southeast Asia and South America,as w ell as the boreal evergreen needle forests.
引文
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