Arid Zone Research ›› 2019, Vol. 36 ›› Issue (1): 220-227.doi: 10.13866/j.azr.2019.01.25

• Climate and Climatic Resources • Previous Articles     Next Articles

Estimation of Daily Value from PAR Instantaneous Value

ZHANG Jing1,2, XIE Ya-nan1, WANG Ming-quan2, WANG Mao-hua2   

  1. 1. Key laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai Institute of Advanced Communication and Data Science,Shanghai University,Shanghai 200000,China;
    2. Shanghai Carbon Data Research Center,Shanghai Advanced Research Institute,Chinese Academy of Sciences, Shanghai 200000,China
  • Received:2018-05-02 Revised:2018-06-15 Published:2025-10-17

Abstract: Photosynthetically active radiation (PAR) commonly refers to solar radiation in the visible (400-700 nm) part of the electromagnetic spectrum.Despite its potential and critical application in terrestrial ecosystem modelling,surface PAR is not typically a routine observation at meteorological station.Remote sensing can be used to derive the spatiotemporally continuous instantaneous PAR,but the researches about daily PAR estimation are deficient,and their accuracy cannot be guaranteed.In this paper,a linear regression model was developed to calculate the daily PAR based on Surface Radiation Budget Network (SURFRAD) data through the instantaneous and theoretical PAR.The results indicated that the model was effective with root mean square errors (RMSE) about 8.863 1 W·m-2,with coefficient of determination (R2) about 0.977 without the limitations of areas.

Key words: photosynthetically active radiation, instantaneous value, daily value, linear regression model, method research