Estimation of solar‐induced vegetation fluorescence from space measurements

Abstract

[1] A characteristic spectral emission is observed in vegetation chlorophyll under excitation by solar radiation. This emission, known as solar-induced chlorophyll fluorescence, occurs in the red and near infra-red spectral regions. In this paper a new methodology for the estimation of solar-induced chlorophyll fluorescence from spaceborne and airborne sensors is presented. The fluorescence signal is included in an atmospheric radiative transfer scheme so that chlorophyll fluorescence and surface reflectance are retrieved consistently from the measured at-sensor radiance. This methodology is tested on images acquired by the

Tracking photosynthetic injury of Paraquat-treated crop using chlorophyll fluorescence from hyperspectral data

“…For example, the SIF signals at 656 nm, 687 nm, and 760 nm were successfully separated from the observed apparent vegetation reflectance based on the Fraunhofer-line principle [Mcfarlane et al, 1980;Carter et al, 1996;Liu et al, 2005;Amoros-Lopez et al, 2008]. Furthermore, Guanter et al [2007] proved for the first time that spaceborne estimation of chlorophyll fluorescence is feasible by coupling an atmospheric correction scheme during the SIF retrieval. The SIF signal is a promising indicator of vegetation conditions.…”

Spaceborne Sun-Induced Vegetation Fluorescence Time Series from 2007 to 2015 Evaluated with Australian Flux Tower Measurements

“…However, local fluorescence measurement techniques are rapidly advancing and show their value in studying the ecophysiology of photosynthesis at the leaf level and in situ ( [52] and references therein). During the last decade, SiF has been successfully measured from tower [26,[64][65][66], aircraft [27,67,68] and satellite platforms [32,34,35,41]. For evaluation purposes, vegetation indices from satellite measurements (such as the NDVI) can be used as first proxies for SiF from spaceborne measurements due to their similar spatio-temporal patterns; they can therefore be used as a qualitative indicator of vegetation activity.…”

“…Early work on satellite remote sensing of vegetation fluorescence investigated the possibility of using the filling-in of strong Fraunhofer lines and specifically the filling-in of the dark and spectrally wide O 2 A (~760 nm) and O 2 B (~687 nm) line absorption bands (e.g., [28,41,42]). The proposed methods typically require accurate modelling of atmospheric radiative transfer in the absorption bands.…”

Note on rotational-Raman scattering in the O<sub>2</sub> A- and B-bands

“…Recent advances in the satellite retrieval of chlorophyll fluorescence in the NIR (Guanter et al, 2007(Guanter et al, , 2010Joiner et al, 2011Joiner et al, , 2012Frankenberg et al, 2011a,b) also call into question the role of RRS in this spectral region. For example, Joiner et al (2011Joiner et al ( , 2012 examined the filling-in of various solar Fraunhofer lines in the NIR and found the effects to be generally small, but not negligible.…”