Reduction of structural impacts and distinction of photosynthetic pathways in a global estimation of GPP from space-borne solar-induced chlorophyll fluorescence

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Zhang , Z , Zhang , Y , Porcar-Castell , A , Joiner , J , Guanter , L , Yang , X , Migliavacca , M , Ju , W , Sun , Z , Chen , S , Martini , D , Zhang , Q , Li , Z , Cleverly , J , Wang , H & Goulas , Y 2020 , ' Reduction of structural impacts and distinction of photosynthetic pathways in a global estimation of GPP from space-borne solar-induced chlorophyll fluorescence ' , Remote Sensing of Environment , vol. 240 , 111722 . https://doi.org/10.1016/j.rse.2020.111722

Title: Reduction of structural impacts and distinction of photosynthetic pathways in a global estimation of GPP from space-borne solar-induced chlorophyll fluorescence
Author: Zhang, Zhaoying; Zhang, Yongguang; Porcar-Castell, Albert; Joiner, Joanna; Guanter, Luis; Yang, Xi; Migliavacca, Mirco; Ju, Weimin; Sun, Zhigang; Chen, Shiping; Martini, David; Zhang, Qian; Li, Zhaohui; Cleverly, James; Wang, Hezhou; Goulas, Yves
Contributor organization: Viikki Plant Science Centre (ViPS)
Department of Forest Sciences
Ecosystem processes (INAR Forest Sciences)
Forest Ecology and Management
Date: 2020-04
Language: eng
Number of pages: 17
Belongs to series: Remote Sensing of Environment
ISSN: 0034-4257
DOI: https://doi.org/10.1016/j.rse.2020.111722
URI: http://hdl.handle.net/10138/340659
Abstract: Quantifying global photosynthesis remains a challenge due to a lack of accurate remote sensing proxies. Solar-induced chlorophyll fluorescence (SIF) has been shown to be a good indicator of photosynthetic activity across various spatial scales. However, a global and spatially challenging estimate of terrestrial gross primary production (GPP) based on satellite SIF remains unresolved due to the confounding effects of species-specific physical and physiological traits and external factors, such as canopy structure or photosynthetic pathway (C-3 or C-4). Here we analyze an ensemble of far-red SIF data from OCO-2 satellite and ground observations at multiple sites, using the spectral invariant theory to reduce the effects of canopy structure and to retrieve a structure-corrected total canopy SIF emission (SIFtotal). We find that the relationships between observed canopy-leaving SIF and ecosystem GPP vary significantly among biomes. In contrast, the relationships between SIFtotal and GPP converge around two unique models, one for C-3 and one for C-4 plants. We show that the two single empirical models can be used to globally scale satellite SIF observations to terrestrial GPP. We obtain an independent estimate of global terrestrial GPP of 129.56 +/- 6.54 PgC/year for the 2015-2017 period, which is consistent with the state-of-the-art data- and process-oriented models. The new GPP product shows improved sensitivity to previously undetected 'hotspots' of productivity, being able to resolve the double-peak in GPP due to rotational cropping systems. We suggest that the direct scheme to estimate GPP presented here, which is based on satellite SIF, may open up new possibilities to resolve the dynamics of global terrestrial GPP across space and time.
Subject: Photosynthesis
Photosynthetic pathway
Chlorophyll fluorescence
Canopy structure
Spectral invariant theory
SUN-INDUCED FLUORESCENCE
GROSS PRIMARY PRODUCTION
NET ECOSYSTEM EXCHANGE
CARBON-DIOXIDE
CANOPY PHOTOSYNTHESIS
PRIMARY PRODUCTIVITY
FEEDBACK MECHANISM
ENERGY FLUXES
CO2 UPTAKE
MODEL
1172 Environmental sciences
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: acceptedVersion


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