4.7 Article

Responses of gross primary productivity to diffuse radiation at global FLUXNET sites

Journal

ATMOSPHERIC ENVIRONMENT
Volume 244, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2020.117905

Keywords

Diffuse fertilization efficiency; Artificial neural network; FLUXNET; Gross primary productivity; Diffuse fraction

Funding

  1. National Natural Science Foundation of China [41975155]
  2. Strategic Priority Research Program of the Chinese Academy of Sciences [XDA19070203]
  3. Startup Foundation for Introducing Talent of NUIST

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This study utilized artificial neural networks and FLUXNET site data to estimate the global effect of diffuse radiation. Evaluations showed that the impact of diffuse radiation on GPP has regional characteristics, and the radiation effect does not depend solely on the increase in intensity.
Diffuse radiation can promote ecosystem gross primary productivity (GPP) and strengthen land carbon sink. However, measurements of diffuse radiation at carbon flux sites are rare, limiting the explorations of diffuse fertilization efficiency (DFE), the percentage changes of GPP per unit diffuse photosynthetically active radiation (PAR). Here, we derive diffuse radiative fraction (K-d) at >200 FLUXNET sites based on an artificial neural network (ANN) and estimate DFE at individual sites around the world. Evaluations show that the ANN on average increases modeling-to-observation correlation coefficients and the Willmott index of K-d by 8% and re-duces root-mean-square error by 14.7% compared to 11 empirical models. High K-d of 0.6-0.82 is located at mid high latitudes and relatively low K-d of 0.46-0.58 is found at subtropical regions. The optimal Kd leading to maximum GPP is estimated to be 0.46 averaged for all FLUXNET sites. In response to 1 W m(2) enhancement of diffuse PAR, daytime GPP increases by 0.44-1.01% for tree species and 0.16-0.94% for non-tree species. Such GPP enhancement by diffuse radiation is on average 2.5 times of that by the same amount of direct radiation.

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