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Xinjiang University (2019)

Study on the Variation of Surface Energy Flux Distribution in the Taklimakan Desert Using Remote Sensing Data


Titre : Study on the Variation of Surface Energy Flux Distribution in the Taklimakan Desert Using Remote Sensing Data

Auteur : 齐斐斐;

Grade : Master’s Theses 2019

Université : Xinjiang University

Résumé partiel
The unique interactions between land and atmosphere in the Taklimakan Desert contribute significantly to regional and global climates and atmospheric circulation.It plays an important role in the climate formation in the arid regions of northwest China and the development of the East Asian monsoon circulation,and also plays an important role in the occurrence and development of severe weather(such as sandstorms)in the northwest,so it is necessary to fully understand the changes in the surface energy flux in desert area.The research on the energy flux of land surface process has been carried out earlier in the world,but with the deepening of the research and the expansion of the research area,the traditional observation of each component of the surface energy flux based on the point scale is not applicable.The development and maturity of remote sensing technology provides a technical means for the study of regional scale,and it is of great significance to the large-scale observation and dynamic monitoring of surface energy flux.In this paper,remote sensing technology is used as the main means to input SEBS(Surface Energy Balance System)model by using various original data and product data of MODIS(Moderate-resolution Imaging Spectroradiometer)image,combined with the scheme of surface feature parameters and meteorological raster data in accordance with the actual situation of the underlying surface of the study area.The spatial and temporal distributions of surface radiant flux,soil heat flux,sensible heat flux and latent heat flux in the Taklimakan Desert and its surrounding areas in the 12months of 2017 were analyzed,and the components of the surface energy flux in the study area were analyzed and discussed.The main conclusions of the study are as follows :(1)From the perspective of time distribution,the net radiation,soil heat flux and sensible heat flux simulated by SEBS model show the highest seasonal variation in summer and the lowest in winter.The overall average of the four seasons of net radiant flux in desert areas are:348.2 W·m-2,453.4W·m-2,376.1W·m-22 and238.2W·m-2,and the simulation results of net radiant flux are compared.Well,the observation error with the Tazhong station is between-9.6 and 16.5W·m-2,and the winter error is higher than that in summer.The overall mean value of soil heat flux is94.8W·m-2 in summer,92.4W·m-2 in spring,77.4W·m-2 in autumn,and 55.9W·m-2 in winter.The error between the upper simulated value and the actual observed value is between±10W·m-2,and the simulation results are generally overestimated except winter

Mots clés : SEBS model; surface energy flux; Taklimakan desert; net radiation; sensible heat flux;

Présentation (CNKI)

Page publiée le 25 mai 2020