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2023 , Vol. 46 >Issue 6: 857 - 867

DOI: https://doi.org/10.12118/j.issn.1000-6060.2022.476

气候变化与地表过程

基于PML-V2数据集的中国蒸散发时空动态特征分析

  • 魏涛 ,
  • 王云权
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  • 中国地质大学（武汉）环境学院，湖北 武汉 430074
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

收稿日期: 2022-09-22

  修回日期: 2022-10-02

  网络出版日期: 2023-07-24

基金资助

国家自然科学基金项目(42071045)

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Temporal and spatial dynamic analysis of terrestrial evapotranspiration in China based on PML-V2 product

  • Tao WEI ,
  • Yunquan WANG
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  • School of Environmental Studies, China University of Geoscience(Wuhan), Wuhan 430074, Hubei, China

Received date: 2022-09-22

  Revised date: 2022-10-02

  Online published: 2023-07-24

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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。

关键词： 蒸散发; 适宜性; 动态特征; 中国

本文引用格式

魏涛 , 王云权 . 基于PML-V2数据集的中国蒸散发时空动态特征分析[J]. 干旱区地理, 2023 , 46(6) : 857 -867 . DOI: 10.12118/j.issn.1000-6060.2022.476

Abstract

Terrestrial evapotranspiration (ET) is an important process of land-atmosphere exchange and an important 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 China, which could provide a reference for regional water resources utilization and optimal allocation.

Key words： evapotranspiration; appropriateness; dynamic characteristic; China

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