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• W4378635512 endingPage "109531" @default.
• W4378635512 startingPage "109531" @default.
• W4378635512 abstract "Solar-induced chlorophyll fluorescence (SIF) is used to estimate terrestrial gross primary production (GPP) due to its physiological link to photosynthesis. However, strong angular variations in satellite-observed SIF (SIFobs), especially for forest canopies with a high structural heterogeneity, hampers robust estimation of GPP. Here, we use directional SIFobs datasets from OCO-2 and TROPOMI satellite sensors and the 3D discrete anisotropic radiative transfer model to investigate the directional properties of far-red SIFobs and their relationships with two GPP products obtained from MODIS and FluxCom datasets for three European forest types with contrasting canopy structures, i.e., boreal, temperate and Mediterranean forests. We found bowl-like angular distribution patterns of SIFobs in both observed and simulated boreal and temperate forests, but no generic distribution pattern of SIFobs was found for the Mediterranean forest. In our GPP estimation of boreal forest, oblique SIFobs performed better than the widely used nadir SIFobs. However, we did not find an optimal view angle suitable for all three forest types. Further, the angular dependencies and forest structure impacts present in SIFobs were found to still propagate into the estimation of total emitted SIF (SIFtotal), which generally regarded as free of these confounding effects. Finally, our results demonstrate that two commonly used variables, i.e., SIFobs with a constant viewing angle and the approximated SIFtotal, both fail to produce a robust relationship with GPP for the Mediterranean forest. These findings highlight the importance of forest canopy structural heterogeneity, including forest floor, on interpretation of directional satellite SIF observations, even when corrected and expressed as a total canopy SIF emission." @default.
• W4378635512 created "2023-05-29" @default.
• W4378635512 creator A5020096341 @default.
• W4378635512 creator A5022202509 @default.
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• W4378635512 creator A5066378254 @default.
• W4378635512 creator A5077322258 @default.
• W4378635512 creator A5079382678 @default.
• W4378635512 creator A5081201426 @default.
• W4378635512 date "2023-07-01" @default.
• W4378635512 modified "2023-10-12" @default.
• W4378635512 title "Analysing far-red SIF directional anisotropy of three structurally contrasting forest canopies towards improved GPP estimation" @default.
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