气候变化领域集成服务门户(CCPortal): Responses of gross primary productivity to diffuse radiation at global FLUXNET sites

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DOI	10.1016/j.atmosenv.2020.117905
	Responses of gross primary productivity to diffuse radiation at global FLUXNET sites
	Zhou H.; Yue X.; Lei Y.; Zhang T.; Tian C.; Ma Y.; Cao Y.
发表日期	2021
ISSN	1352-2310
卷号	244
英文摘要	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 (Kd) 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 Kd by 8% and reduces root-mean-square error by 14.7% compared to 11 empirical models. High Kd of 0.6–0.82 is located at mid-high latitudes and relatively low Kd 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. © 2020 Elsevier Ltd
关键词	Artificial neural network Diffuse fertilization efficiency Diffuse fraction FLUXNET Gross primary productivity
语种	英语
scopus关键词	Carbon; Forestry; Mean square error; Photosynthesis; Phytoplankton; Correlation coefficient; Diffuse radiation; Direct radiations; Gross primary productivity; Photosynthetically active radiation; Radiative fractions; Root mean square errors; Subtropical regions; Radiation; carbon flux; carbon sink; global perspective; midlatitude environment; net primary production; photosynthetically active radiation; subtropical region; article; artificial neural network; correlation coefficient; fertilization; latitude; photosynthetically active radiation; productivity
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248875
作者单位	Climate Change Research Center, Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology (NUIST), Nanjing, 210044, China; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, IAP, CAS, Beijing, 100029, China
推荐引用方式 GB/T 7714	Zhou H.,Yue X.,Lei Y.,et al. Responses of gross primary productivity to diffuse radiation at global FLUXNET sites[J],2021,244.
APA	Zhou H..,Yue X..,Lei Y..,Zhang T..,Tian C..,...&Cao Y..(2021).Responses of gross primary productivity to diffuse radiation at global FLUXNET sites.ATMOSPHERIC ENVIRONMENT,244.
MLA	Zhou H.,et al."Responses of gross primary productivity to diffuse radiation at global FLUXNET sites".ATMOSPHERIC ENVIRONMENT 244(2021).