摘要
陆地蒸散发是陆-气水热交换的重要过程,是全球水分运移及能量转换中重要的一环。识别蒸散发的时空动态特征对研究区域水循环和能量转换具有重要意义。此次研究利用9个通量站观测数据,对比分析了3种全球蒸散发产品(GLEAM、MOD16以及PML-V2)在中国区域的适用性。在此基础上,选取在中国区域适宜性最佳的地表蒸散发产品数据,对2003—2020年中国地表蒸散发时空动态特征进行了分析。结果表明:(1)PML-V2蒸散发产品在中国区域的适用性最佳。(2)在时间上,中国蒸散发在研究时间段呈增长趋势;空间上,研究时间段由西北到东南总体呈增加趋势。(3)基于Hurst指数分析的未来中国蒸散发变化状况,预期将与过去表现相反趋势,即过去总体呈增长趋势,未来蒸散发会下降。此次研究通过对中国地表蒸散发时空动态特征进行分析,以期为区域水资源利用及优化配置提供参考借鉴。
Terrestrial evapotranspiration(ET)is an important process of land-atmosphere exchange and an impor-tant link in the global water migration and energy transfer system.Identifying the temporal and spatial dynamic characteristics of ET is of great significance in the study of regional water cycle and energy conversion.In this study,we compared the appropriateness of the three different ET products(GLEAM,MOD16,and PML-V2)in China using the flux data of nine tower stations in the country.We used the dataset of ET products between 2003 and 2020 to analyze the temporal and spatial dynamic characteristics of evapotranspiration in China.The results showed the following:(1)The ET products of PML-V2 is the most suitable for China.(2)On the time scale,ET gradually increased during the research period.On the spatial scale,ET exhibited an increasing tendency during 2003—2020 from northwest to southeast of China.(3)According to the Hurst index,the future ET of the whole nation is expected to show the opposite trend compared to the past.This means that ET increased in the past but is expected to decrease in the future.This study analyzed the spatiotemporal dynamic characteristics of ET in Chi-na,which could provide a reference for regional water resources utilization and optimal allocation.
作者
魏涛
王云权
WEI Tao;WANG Yunquan(School of Environmental Studies,China University of Geoscience(Wuhan),Wuhan 430074,Hubei,China)
出处
《干旱区地理》
CSCD
北大核心
2023年第6期857-867,共11页
Arid Land Geography
基金
国家自然科学基金项目(42071045)资助。
关键词
蒸散发
适宜性
动态特征
中国
evapotranspiration
appropriateness
dynamic characteristic
China
作者简介
魏涛(1993-),男,硕士研究生,主要从事陆-气水分交换研究.E-mail:wt@cug.edu.cn;通讯作者:王云权(1987-),男,副教授,主要从事土壤水分运移研究.E-mail:wangyq@cug.edu.cn。
