globalchange  > 气候变化事实与影响
DOI: 10.1016/j.jag.2017.10.006
Scopus记录号: 2-s2.0-85036508936
论文题名:
Assessing the relationship between microwave vegetation optical depth and gross primary production
作者: Teubner I; E; , Forkel M; , Jung M; , Liu Y; Y; , Miralles D; G; , Parinussa R; , van der Schalie R; , Vreugdenhil M; , Schwalm C; R; , Tramontana G; , Camps-Valls G; , Dorigo W; A
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2018
卷: 65
起始页码: 79
结束页码: 91
语种: 英语
英文关键词: AMSR-E ; ASCAT ; Ecosystem productivity ; Microwave remote sensing ; SMOS ; Vegetation dynamics
Scopus关键词: AMSR-E ; ASCAT ; data set ; optical depth ; primary production ; remote sensing ; sensor ; SMOS ; vegetation
英文摘要: At the global scale, the uptake of atmospheric carbon dioxide by terrestrial ecosystems through photosynthesis is commonly estimated through vegetation indices or biophysical properties derived from optical remote sensing data. Microwave observations of vegetated areas are sensitive to different components of the vegetation layer than observations in the optical domain and may therefore provide complementary information on the vegetation state, which may be used in the estimation of Gross Primary Production (GPP). However, the relation between GPP and Vegetation Optical Depth (VOD), a biophysical quantity derived from microwave observations, is not yet known. This study aims to explore the relationship between VOD and GPP. VOD data were taken from different frequencies (L-, C-, and X-band) and from both active and passive microwave sensors, including the Advanced Scatterometer (ASCAT), the Soil Moisture Ocean Salinity (SMOS) mission, the Advanced Microwave Scanning Radiometer for Earth Observation System (AMSR-E) and a merged VOD data set from various passive microwave sensors. VOD data were compared against FLUXCOM GPP and Solar-Induced chlorophyll Fluorescence (SIF) from the Global Ozone Monitoring Experiment-2 (GOME-2). FLUXCOM GPP estimates are based on the upscaling of flux tower GPP observations using optical satellite data, while SIF observations present a measure of photosynthetic activity and are often used as a proxy for GPP. For relating VOD to GPP, three variables were analyzed: original VOD time series, temporal changes in VOD (ΔVOD), and positive changes in VOD (ΔVOD≥0). Results show widespread positive correlations between VOD and GPP with some negative correlations mainly occurring in dry and wet regions for active and passive VOD, respectively. Correlations between VOD and GPP were similar or higher than between VOD and SIF. When comparing the three variables for relating VOD to GPP, correlations with GPP were higher for the original VOD time series than for ΔVOD or ΔVOD≥0 in case of sparsely to moderately vegetated areas and evergreen forests, while the opposite was true for deciduous forests. Results suggest that original VOD time series should be used jointly with changes in VOD for the estimation of GPP across biomes, which may further benefit from combining active and passive VOD data. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79896
Appears in Collections:气候变化事实与影响

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作者单位: Department of Geodesy and Geoinformation, TU Wien, Gußhausstraße 27-29, Vienna, Austria; Department for Biogeochemical Integration, Max Planck Institute for Biogeochemistry, P.O. Box 10 01 64, Jena, Germany; School of Geography and Remote Sensing, Nanjing University of Information Science & Technology (NUIST), No.219, Ningliu Road, Nanjing, Jiangsu, China; Laboratory of Hydrology and Water Management, Ghent University, Campus Coupure, Coupure links 653, Ghent, Belgium; VanderSat B.V., Huygensstraat 34, Noordwijk, DK, Netherlands; Woods Hole Research Center, 149 Woods Hole Road, Falmouth, MA, United States; Center for Ecosystem Science and Society, Northern Arizona University, P.O. Box 5620, Flagstaff, AZ, United States; Department for Innovation in Biological Agro-food and Forest systems (DIBAF), Tuscia University, Via San Camillo de Lellis s.n.c., Viterbo, Italy; Image and Signal Processing Group (ISP), Universitat de València, Calle Catedrático José Beltrán 2, Paterna (València), Spain

Recommended Citation:
Teubner I,E,, Forkel M,et al. Assessing the relationship between microwave vegetation optical depth and gross primary production[J]. International Journal of Applied Earth Observation and Geoinformation,2018-01-01,65
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