Models and measurements of seven years of evapotranspiration on a high elevation site on the Central Tibetan Plateau  被引量:1

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作  者:WANG Li-hui HE Xiao-bo Jakob FSTEINER ZHANG Dong-wei WU Jin-kui WANG Shao-yong DING Yong-jian 

机构地区:[1]State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Physical Geography,Utrecht University,Utrecht 3584CB,Netherlands

出  处:《Journal of Mountain Science》2020年第12期3039-3053,共15页山地科学学报(英文)

基  金:National Key Research and Development Plan projects (2017YFC0405706, 2017YFC0405704);CRSRI Open Research Program (program SNCKWV2017534/KY);Key Funds of the National Natural Science Foundation (41730751);National Natural Science Foundation of China (4171079);Special Fund for Basic Scientific Research Operating Expenses of Central Public Welfare Research Institutes (CKSF2017045);National Key Laboratory of Cryosphere Science (SKLCS-ZZ2020)。

摘  要:Evapotrantaspiration is a crucial part of the hydrological cycle but few ground observatories for the Tibetan Plateau exist.In this study,we present lysimeter measurements from the growing season during seven years at a remote field location on the Tibetan Plateau.The measurements show rates between 2.5 and 3 mm·d-1 during the warmer months from June to August,dropping to 2 to 2.5 mm·d-1 in September.This results in a total volume of evapotranspiration of approximately 300 mm·yr-1 for the months from June to September.The inter-daily variability is however large,and comparison to meteorological variables suggest that this is largely driven by radiation and humidity.Data for a single season from a nearby flux tower allows us to compare the two common measurement methods for evapotranspiration in the field,showing an overall good agreement between the approaches.We also tested commonly applied models used to estimate evapotranspiration rates,namely the FAO-PenmanMonteith(PM) and the Priestly-Taylor(PT) model,which both make use of radiation data as well as the simpler Hargreaves-Samani(HS) and Rohwer(R)models which only need air temperature and wind speed as input.The most data intensive model(PM)has the lowest root mean square error(RMSE)(1.36 mm·d-1) and the mean bias error(MBE)(-0.05 mm·d-1) and reproduces the daily variability generally well.The much simpler HS model performs slightly worse(1.38 and 0.35 mm·d-1),but fails to reproduce the variability,due to its lack of information of local radiation and humidity data.Our results are in line with large scale estimates of evapotranspiration for the cold and arid region,provide a first long time series of in-situ measurements from a high elevation site and suggest that both the PM and HS models are appropriate when no direct measurements are available.

关 键 词:EVAPOTRANSPIRATION Alpine meadow FAO-Penman-Monteith Priestley-Taylor Hargreaves-Samani Rohwer LYSIMETER 

分 类 号:P426.2[天文地球—大气科学及气象学] P339[天文地球—水文科学]

 

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