Angular normalization of GOME-2 Sun-induced chlorophyll fluorescence observation as a better proxy of vegetation productivity

摘要: Sun-induced chlorophyll fluorescence (SIF) has been regarded as a promising proxy for gross primary productivity (GPP) over land. Considerable uncertainties in GPP estimation using remotely sensed SIF exist due to variations the Sun-satellite view observation geometry that could induce unwanted observation. In this study, we normalize far-red Global Ozone Monitoring Experiment-2 observations on sunny days hot spot direction (SIFh) represent sunlit leaves and compute weighted sum of (SIFt) from shaded canopy. We found SIFh is better correlated with simulated by process-based ecosystem model SIFt total than original observations. The coefficient determination (R2) are increased 0.04 ± 0.03, 0.07 ± 0.04 global average SIFt, respectively. most significant increases R2 (0.09 ± 0.04 0.05 ± 0.03 SIFh) appear deciduous broadleaf forests.