Evaluation and comparison of light use efficiency models for their sensitivity to the diffuse PAR fraction and aerosol loading in China

doi:10.1016/j.jag.2020.102269

	Evaluation and comparison of light use efficiency models for their sensitivity to the diffuse PAR fraction and aerosol loading in China
	Li, Xin 2,3; Liang, Hongyu 1; Cheng, Weiming 3
刊名	INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
	2021-03-01
卷号	95 页码:16
关键词	PAR(dif) fraction Aerosol optical depth (AOD) Gross primary productivity (GPP) Sensitivity
ISSN号	1569-8432
DOI	10.1016/j.jag.2020.102269
通讯作者	Liang, Hongyu(allenhongyu.liang@connect.polyu.hk)
英文摘要	The diffuse photosynthetically active radiation (PAR(dif)) is highly related to the gross primary productivity (GPP) of vegetation and can enhance the photosynthetic rate of shaded leaves. The PAR(dif) is mainly influenced by aerosols on clear sky days. To explore the impacts of the PAR(dif) fraction and aerosol loading on the accuracy of GPP estimations, we evaluated and compared the sensitivity of one-leaf and two-leaf light use efficiency (LUE) models (MOD17 and TL-LUE models) to the PAR(dif) fraction and aerosol optical depth (AOD) using satellite data and measurements at ChinaFLUX sites in China from 2003 to 2010. The estimated GPP from two models (GPP_MOD and GPP_TL) showed systematic underestimations when compared with the measured GPP at ChinaFLUX sites (GPP_FLUX). In addition, the underestimation of the GPP estimated by the two models was larger in months with high PAR(dif) fractions than in months with low PAR(dif) fractions at most sites. The TL-LUE model exhibited better performance than the MOD17 model with reduced underestimation and root-mean-square error (RMSE) values when the PAR(dif) fraction was greater than 0.7 or 0.8. When the PAR(dif) fraction was low, the TL-LUE model reduced the overestimation or increased the underestimations of GPP compared with the MOD17 model depending on the site. Both MOD17 and TL-LUE exhibited higher underestimations of GPP at high AOD values than at low AOD values at most sites. The TL-LUE model exhibited an overall better performance than MOD17 under high AOD. The overestimation also occurred for low AOD, which was consistent with that for low PARdif fractions. Therefore, the two LUE models showed dynamic performance with variations in the PAR(dif) fraction and AOD, which should be considered in the application and further improvement of GPP models.
资助项目	China Postdoctoral Science Foundation[2019M650830] ; Jiangsu Surveying and GIS Science Foundation[JSCHKY201912]
WOS关键词	GROSS PRIMARY PRODUCTION ; PRIMARY PRODUCTIVITY ; RADIATION ; PARAMETERIZATION ; IMPACTS
WOS研究方向	Remote Sensing
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000601163600002
资助机构	China Postdoctoral Science Foundation ; Jiangsu Surveying and GIS Science Foundation
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/137835]
专题	中国科学院地理科学与资源研究所
通讯作者	Liang, Hongyu
作者单位	1.Hong Kong Polytech Univ, Dept Land Surveying & Geoinformat, Hong Kong 999077, Peoples R China 2.Image Sky Int Co Ltd, Guangzhou, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Li, Xin,Liang, Hongyu,Cheng, Weiming. Evaluation and comparison of light use efficiency models for their sensitivity to the diffuse PAR fraction and aerosol loading in China[J]. INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION,2021,95:16.
APA	Li, Xin,Liang, Hongyu,&Cheng, Weiming.(2021).Evaluation and comparison of light use efficiency models for their sensitivity to the diffuse PAR fraction and aerosol loading in China.INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION,95,16.
MLA	Li, Xin,et al."Evaluation and comparison of light use efficiency models for their sensitivity to the diffuse PAR fraction and aerosol loading in China".INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION 95(2021):16.