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干旱区地理 ›› 2018, Vol. 41 ›› Issue (1): 32-37.

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Estimating instantaneous solar radiation and daytime net radiation with Landsat8 data on clear-sky days in arid areas

GUO Peng1,2, WU Fa-dong1   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China;
    2. College of Sciences, Shihezi University, Shihezi, Xinjiang 832003, China
  • Received:2017-08-08 Revised:2017-11-25 Online:2018-01-25

Abstract: Surface net radiation is the result of the radiation balance of shortwave radiation flux and longwave radiation flux on the Earth's surface.It is a very important aspect in the research of surface evapotranspiration and hydrothermal equilibrium.In this paper,the net radiation was estimated by using the method proposed by Bisht et al.with the Landsat8 remote sensing image of August 31,2014.First,the shortwave radiation and longwave radiation are estimated by calculating the instantaneous atmospheric transmission rate,instantaneous shortwave solar radiation and downstream longwave radiation.The instantaneous net radiation and daily net radiation were then obtained by calculating the surface albedo.Finally,the verification on the calculated values was conducted using the ground measurement data.With an average error of 14.5 W·m-2,the estimated results were very similar to the measured ones,which indicated that the Landsat8 data and some meteorological parameters can be used to simulate the distribution of the instantaneous solar radiation and daytime net radiation on clear-sky days in this area.The method in this study avoided the computation complexity when using other remote sensing data to estimate the surface radiation parameters and it improved the estimation accuracy.

Key words: net radiation, sunny day, instantaneous, daytime net radiation, Landsat

CLC Number: 

  • TP79