CLM5.0对高寒山区蒸散发模拟的适用性评估  

Evaluation of CLM5.0 in simulating evapotranspiration in an alpine region

作　　者：宁锋伟 张兰慧[1] 曾璇 白旭亮 NING Fengwei;ZHANG Lanhui;ZENG Xuan;BAI Xuliang(Key Laboratory of West China’s Environmental System(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学资源环境学院西部环境教育部重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2023年第1期119-129,共11页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金面上项目“祁连山区土壤水分对陆面水文过程的影响机理和模拟研究”(41877148);“中央高校基本科研业务费专项资金”战略发展专项项目(lzujbky-2021-sp12);中国科学院内陆河流域生态水文重点实验室开放基金项目资助。

摘　　要：蒸散发是地表水文循环和能量交换过程的重要组成部分,且在高寒山区有极强的时空异质性,准确模拟蒸散发对于研究高寒山区水文循环过程有着重要的意义。CLM5.0(Community Land Model5.0)是CLM模式的最新版本,具有较为完善的水文循环机制,是目前国际上发展最为完善的陆面过程模式之一。基于典型高寒山区黑河上游五个观测站的观测数据,对CLM5.0的蒸散发模拟性能进行评估。结果表明:CLM5.0在模拟蒸散发时结果总体上可信,其R值的范围在0.601~0.839之间,RSR值的范围在0.964~1.145之间,BIAS值的范围在^(-1).220~-0.597 mm·d^(-1)之间。说明CLM5.0在高寒山区可以较好地捕捉观测到蒸散发的时间趋势,但仍存在一定的低估。非生长季的BIAS值的范围在-0.904~-0.367 mm·d^(-1)之间,生长季的BIAS值的范围在-2.094~-0.794 mm·d^(-1)之间,这表明蒸散发模拟值的低估主要来自生长季的模拟。高寒草甸上R值的范围在0.299~0.651之间,RSR值的范围在1.135~1.332之间,高寒草地上R值为0.209,RSR值为1.450,因此,CLM5.0在草甸的模拟性能优于草地。CLM5.0白天R值的范围在0.605~0.840之间,RSR值的范围在0.252~1.193之间,夜晚R值的范围在0.344~0.651之间,RSR值的范围在0.482~2.966之间,对比可知CLM5.0在白天模拟蒸散发的性能优于夜晚。这些结论可为CLM5.0的应用和改进提供科学依据。Evapotranspiration(ET) plays a key role in land surface-atmosphere hydrological and energy interactions, and shows strong tempo-spatial variabilities in high mountainous area. Accurate estimates of ET are important for researches in hydrological processes in high mountainous area. The latest version of Community Land Model(CLM), CLM5.0 is a state-of-the-art land surface model to date. The performance of CLM5.0 in simulating ET was evaluated against in situ observations at five in situ sites in the upper reaches of Heihe river watershed, a typical alpine mountainous area. Results show that ET simulated by CLM5.0 is reliable with R values of 0.601~0.839, RSR values of 0.964~1.145, and BIAS values of^(-1).220~0.597 mm·d^(-1). It indicates that CLM5.0 performs well in catching temporal trend of observed ET, but still with a certain underestimation.The BIAS values range between-0.904~-0.367 mm·d^(-1)during the non-growth period, and range between-2.094~-0.794 mm·d^(-1)during the growth period, which indicates that the underestimation of the simulated value is mainly derived from the simulation of the growth period. Meanwhile, R values range between 0.299~0.651 and RSR values range between 1.135~1.332 on alpine meadow, whereas R value is 0.209 and RSR value is 1.450 on alpine grassland. Thus, the performance of CLM5.0 in simulating ET is better on meadow than on grassland. R values range between 0.605~0.840 and RSR values range between 0.252~1.193 during the daytime, whereas R values range between 0.344~0.651 and RSR values range between 0.482~2.966 during the night, by comparison, the performance of CLM5.0 in simulating ET is better during the daytime than night.These conclusions can provide a scientific basis for the application and improvement of CLM5.0.

关 键 词：CLM5.0 蒸散发 适用性 高寒山区 

分 类 号：P332.2[天文地球—水文科学]