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实际蒸发转化量的变化对中国东南河流域干旱的影响

Sheng Hong^1,2,3,4, Haijun Deng^5,6,7,8, Zhouyao Zheng^1,2,3,4

¹Institute of Geography, Fujian Normal University, Fuzhou, 350117, China.

Scientific reports

|December 4, 2023

概括

40年来,由于植被变化,中国东南河流域的实际蒸发转化量显著增加. 这种蒸发转化量的增加是引发区域季节性干旱的关键因素.

科学领域:

水文学的水文学
气候科学气候科学
环境科学环境科学

背景情况:

了解实际蒸发转化变化对于分析干旱等区域极端水文事件至关重要.
中国东南河流域是研究水气候过程的关键区域.

研究的目的:

在中国东南河流域40年 (1981-2020年) 分析实际蒸发转化 (ET) 的空间和时间特征.
量化ET变化与干旱指数之间的关系,确定ET在干旱发生中的作用.

主要方法:

利用全球土地蒸发阿姆斯特丹模型 (GLEAM) 来评估ET趋势和组件.
与标准化差异植被指数 (NDVI) 和标准化降水蒸发指数 (SPEI) 相对应的ET数据.

主要成果:

在东南河流域,实际蒸发透气量显示出显著的增长趋势 (2.51毫米/年,p < 0.01).
植被透气 (73.45%) 和树冠拦截 (18.26%) 主导了ET组件. 植被变化解释了自2000年以来ET增加的10.66%.
在ET和SPEI之间发现了显著的负空间相关性 (莫兰I = -0.513),表明ET增加有助于干旱.

结论:

东南河流域实际蒸发的增加是导致季节性干旱发展的重要因素.
这些发现增强了对中国东南沿海地区水气候过程动态的理解.

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