Variation of intra-daily instantaneous FAPAR estimated from the geostationary Himawari-8 AHI data

doi:10.1016/j.agrformet.2021.108535

	Variation of intra-daily instantaneous FAPAR estimated from the geostationary Himawari-8 AHI data
	Zhang, Yinghui 1,2; Fang, Hongliang 1,2; Wang, Yao 1,2; Li, Sijia 1,2
刊名	AGRICULTURAL AND FOREST METEOROLOGY
	2021-09-15
卷号	307 页码:17
关键词	Himawari-8 AHI FAPAR Intra-day Radiative transfer model Validation
ISSN号	0168-1923
DOI	10.1016/j.agrformet.2021.108535
通讯作者	Zhang, Yinghui(zhangyh.17b@igsnrr.ac.cn)
英文摘要	The fraction of absorbed photosynthetically active radiation (FAPAR) quantifies the efficiency of light absorption by vegetation. The intra-daily variation in FAPAR is important for monitoring vegetation growth but current studies to estimate the intra-daily FAPAR from remote sensing are limited. This study proposes to estimate the intra-daily variations of the direct, diffuse, and total FAPARs on clear days from the geostationary Himawari-8 AHI data. A look-up table inversion method was developed based on simulations of a radiative transfer model that couples a soil reflectance (GSV, General Spectral Vectors), canopy (PROSAIL), and atmospheric models (6SV, Second Simulation of a Satellite Signal in the Solar Spectrum). Field measurements were conducted over paddy rice fields in Northeast China from June 22 to August 25, 2019, to obtain continuous FAPAR measurements using an AccuPAR ceptometer and digital hemispherical photography. The instantaneous FAPAR values were analyzed and evaluated with field measurements and MODIS and GEOV2 FAPAR products. The results show that the retrieved AHI FAPAR values are consistent with the field measurements (R-2 > 0.75). The AHI, MODIS, and GEOV2 FAPAR values display similar spatial and temporal patterns over the growing season (R-2 > 0.66). The intra-daily variations in the total and direct FAPAR values agree with the field measurements, and both show a "bowl-shaped" pattern with the smallest value found at noon. The diffuse FAPAR remains stable before 16:00 local solar time (LST). The instantaneous total and direct FAPAR values at 10:00 - 10:30 LST usually assumed to be daily values underestimate the daily values, while the values at 9:30 and 14:30 LST can better represent the daily FAPAR. As a future study, global intra-daily instantaneous and daily FAPAR products could be generated by combining all geostationary satellite data.
资助项目	National Key Research and Development Program of China[2016YFA0600201]
WOS关键词	PHOTOSYNTHETICALLY ACTIVE RADIATION ; LEAF-AREA INDEX ; ESSENTIAL CLIMATE VARIABLES ; TIME-SERIES ; TRANSFER MODEL ; GEOV1 LAI ; FRACTION ; VALIDATION ; PRODUCTS ; ALGORITHM
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000682515100045
资助机构	National Key Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/164667]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Yinghui
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yinghui,Fang, Hongliang,Wang, Yao,et al. Variation of intra-daily instantaneous FAPAR estimated from the geostationary Himawari-8 AHI data[J]. AGRICULTURAL AND FOREST METEOROLOGY,2021,307:17.
APA	Zhang, Yinghui,Fang, Hongliang,Wang, Yao,&Li, Sijia.(2021).Variation of intra-daily instantaneous FAPAR estimated from the geostationary Himawari-8 AHI data.AGRICULTURAL AND FOREST METEOROLOGY,307,17.
MLA	Zhang, Yinghui,et al."Variation of intra-daily instantaneous FAPAR estimated from the geostationary Himawari-8 AHI data".AGRICULTURAL AND FOREST METEOROLOGY 307(2021):17.