The variability of pan evaporation over China during 1961-2020

IF 3.1 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Hong Wang, F. Sun, Fa Liu, Tingting Wang, Yao Feng, Wenbin Liu
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引用次数: 0

Abstract

The most basic features of climatological normals and variability are useful for describing observed or likely future climate fluctuations. Pan evaporation (Epan) is an important indicator of climate change; however, current research on Epan has focused on its change in mean rather than its variability. The variability of monthly Epan from 1961 to 2020 at 969 stations in China was analyzed using a theoretical framework that can distinguish changes in Epan variance between space and time. The Epan variance was decomposed into spatial and temporal components, and the temporal component was further decomposed into inter-annual and intra-annual components. The results show that the variance in Epan was mainly controlled by the temporal component. The time variance was mainly controlled by intra-annual variance, decreasing continuously in the first 30 years, and slightly increasing after the 1990s. This is mainly due to the fact that the decrease of wind speed and the increase of water vapor pressure deficit with the temperature increase offset each other and inhibit the variability of Epan. The variance decreased more in the northern region, whereas it exhibited a small decrease or slight increase in the southern region. The reduction in seasonality was dominated by spring, followed by summer. The differences in Epan variability in space and season were mainly caused by the differing rates of change in evaporation driving forces, such as a greater reduction in wind speed in the northern region and spring.
1961-2020年中国蒸发皿蒸发量的变率
气候常态和变率的最基本特征对于描述已观测到的或未来可能出现的气候波动是有用的。蒸发皿蒸发量是气候变化的重要指标;然而,目前对Epan的研究主要集中在其平均值的变化,而不是其变异性。利用可区分时空变化的理论框架,分析了1961—2020年中国969个台站的Epan逐月变化特征。将Epan方差分解为空间分量和时间分量,时间分量进一步分解为年际和年内分量。结果表明,Epan的变化主要受时间分量的控制。时间方差主要受年内方差控制,前30年持续下降,90年代以后略有上升。这主要是由于随着气温的升高,风速的减小和水汽压亏缺的增大相互抵消,抑制了Epan的变率。北方地区的方差减小较多,而南方地区的方差减小或增加较少。季节性的减少以春季为主,其次是夏季。空间和季节变异的差异主要是由于蒸发驱动力的变化率不同造成的,如北部地区和春季的风速降低幅度较大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Hydrometeorology
Journal of Hydrometeorology 地学-气象与大气科学
CiteScore
7.40
自引率
5.30%
发文量
116
审稿时长
4-8 weeks
期刊介绍: The Journal of Hydrometeorology (JHM) (ISSN: 1525-755X; eISSN: 1525-7541) publishes research on modeling, observing, and forecasting processes related to fluxes and storage of water and energy, including interactions with the boundary layer and lower atmosphere, and processes related to precipitation, radiation, and other meteorological inputs.
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