A Study on the Assessment and Integration of Multi-Source Evapotranspiration Products over the Tibetan Plateau  

作　　者：Ming CHENG Lei ZHONG Yaoming MA Han MA Yaoxin CHANG Peizhen LI Meilin CHENG Xian WANG Nan GE 

机构地区：[1]School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China [2]CAS Center for Excellence in Comparative Planetology,Hefei 230026,China [3]Jiangsu Collaborative Innovation Center for Climate Change,Nanjing 210023,China [4]Frontiers Science Center for Planetary Exploration and Emerging Technologies,University of Science and Technology of China,Hefei 230026,China [5]Land-Atmosphere Interaction and its Climatic Effects Group,State Key Laboratory of Tibetan Plateau Earth System,Resources and Environment(TPESRE),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China [6]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [7]College of Atmospheric Science,Lanzhou University,Lanzhou 730000,China [8]National Observation and Research Station for Qomolongma Special Atmospheric Processes and Environmental Changes,Dingri 858200,China [9]Kathmandu Center of Research and Education,Chinese Academy of Sciences,Beijing 100101,China [10]China-Pakistan Joint Research Center on Earth Sciences,Chinese Academy of Sciences,Islamabad 45320,Pakistan

出　　处：《Advances in Atmospheric Sciences》2024年第3期435-448,共14页大气科学进展（英文版）

基　　金：funded by the Second Tibetan Plateau Scientific Expedition and Research(STEP)Program(Grant No.2019QZKK0103);National Natural Science Foundation of China(Grant Nos.41875031,42230610,41522501,41275028);CLIMATE-Pan-TPE in the framework of the ESA-MOST Dragon 5 Programme(Grant ID 58516)。

摘　　要：Evapotranspiration(ET)is a crucial variable in the terrestrial water,carbon,and energy cycles.At present,a large number of multi source ET products exist.Due to sparse observations,however,great challenges exist in the evaluation and integration of ET products in remote and complex areas such as the Tibetan Plateau(TP).In this paper,the applicability of the multiple collocation(MC)method over the TP is evaluated for the first time,and the uncertainty of multisource ET products(based on reanalysis,remote sensing,and land surface models)is further analyzed,which provides a theoretical basis for ET data fusion.The results show that 1)ET uncertainties quantified via the MC method are lower in RS-based ET products(5.95 vs.7.06 mm month^(-1))than in LSM ET products(10.22 vs.17.97 mm month^(-1))and reanalysis ET estimates(7.27 vs.12.26 mm month-1).2)A multisource evapotranspiration(MET)dataset is generated at a monthly temporal scale with a spatial resolution of 0.25°across the TP during 2005-15.MET has better performance than any individual product.3)Based on the fusion product,the total ET amount over the TP and its patterns of spatiotemporal variability are clearly identified.The annual total ET over the entire TP is approximately 380.60 mm.Additionally,an increasing trend of 1.59±0.85 mm yr^(-1)over the TP is shown during 2005-15.This study provides a basis for future studies on water and energy cycles and water resource management over the TP and surrounding regions.

关 键 词：EVAPOTRANSPIRATION data fusion multiple collocation the Tibetan Plateau 

分 类 号：P426.2[天文地球—大气科学及气象学]