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Variation of intra-daily instantaneous FAPAR estimated from the geostationary Himawari-8 AHI data
Zhang, Yinghui1,2; Fang, Hongliang1,2; Wang, Yao1,2; Li, Sijia1,2
2021-09-15
Source PublicationAGRICULTURAL AND FOREST METEOROLOGY
ISSN0168-1923
Volume307Pages:17
Corresponding AuthorZhang, Yinghui(zhangyh.17b@igsnrr.ac.cn)
AbstractThe 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.
KeywordHimawari-8 AHI FAPAR Intra-day Radiative transfer model Validation
DOI10.1016/j.agrformet.2021.108535
WOS KeywordPHOTOSYNTHETICALLY ACTIVE RADIATION ; LEAF-AREA INDEX ; ESSENTIAL CLIMATE VARIABLES ; TIME-SERIES ; TRANSFER MODEL ; GEOV1 LAI ; FRACTION ; VALIDATION ; PRODUCTS ; ALGORITHM
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFA0600201]
Funding OrganizationNational Key Research and Development Program of China
WOS Research AreaAgriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS SubjectAgronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS IDWOS:000682515100045
PublisherELSEVIER
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/164668
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhang, Yinghui
Affiliation1.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
Recommended Citation
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.
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