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Seasonal evapotranspiration changes (1983–2006) of four large basins on the Tibetan Plateau
Author(s) -
Li Xiuping,
Wang Lei,
Chen Deliang,
Yang Kun,
Wang Aihui
Publication year - 2014
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/2014jd022380
Subject(s) - evapotranspiration , water balance , precipitation , environmental science , plateau (mathematics) , structural basin , drainage basin , climatology , hydrology (agriculture) , trend analysis , climate change , physical geography , geography , meteorology , mathematics , geology , statistics , ecology , mathematical analysis , geotechnical engineering , biology , paleontology , oceanography , cartography
Lack of reliable historical basin‐scale evapotranspiration ( ET ) estimates is a bottleneck for water balance analyses and model evaluation on the Tibetan Plateau (TP). This study looks at four large basins on the TP to develop a general approach suitable for large river basins to estimate historical monthly ET . Five existing global ET products are evaluated against monthly ET estimated by the water balance method as a residual from precipitation ( P ), terrestrial water storage change (Δ S ), and discharge ( R ). The five ET products exhibit similar seasonal variability, despite of the different amounts among them. A bias correction method, based on the probability distribution mapping between the reference ET and the five products during 2003–2012, effectively removes nearly all biases and significantly increases the reliability of the products. Then, the surface water balance changes for the four basins are analyzed based on the corrected ET products as well as observed P and R during 1983–2006. A trend analysis shows an upward trend for ET in the four basins for all seasons during the past three decades, along with the regional warming, as well as a dominating increasing trend in P and negative trend in R .