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Spatiotemporal Evolution of Evapotranspiration in China after 1998
Water ( IF 3.4 ) Pub Date : 2020-11-19 , DOI: 10.3390/w12113250 Qi Guo , Jiening Liang , Xianjie Cao , Zhida Zhang , Lei Zhang
Water ( IF 3.4 ) Pub Date : 2020-11-19 , DOI: 10.3390/w12113250 Qi Guo , Jiening Liang , Xianjie Cao , Zhida Zhang , Lei Zhang
Changes in water circulation and uneven distributions of water resources caused by global warming are prominent problems facing the world at present. It is important to understand the influencing factors, and evapotranspiration (ET) is a key parameter for measuring the water cycle. However, understanding of spatiotemporal changes in actual evapotranspiration and its mechanism is still limited by a lack of long-term and large-scale in situ datasets. Here, the evolution of evapotranspiration in typical East Asian monsoon areas in China from 1989 to 2005 was analyzed with global land ET synthesis products. Evapotranspiration in China showed evident interdecadal variations around 1998; it decreased before 1998 and subsequently increased, which is inversely related to global ET changes. We further divided China into water-control and energy-control regions to discuss the factors influencing ET changes in each region. The interdecadal variations in increasing ET after 1998 in China were dominated by increasing potential evaporation in the energy-control region. An analysis using the empirical orthogonal function (EOF) method found that this occurred because ET is mainly manifested as decadal changes controlled by climate warming in the energy-control region and as interannual variations in the water-control region. The different feedbacks of ET on climate change in the two regions were also reflected in the difference in energy partition. The change in the Bowen rate (BR) did not increase climatic differences between energy- and water-control zones, but increases in the BR in arid summers significantly affected local weather and climate.
更新日期：2020-11-19
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