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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dc.contributor.author Zhang, Zhaoying
dc.contributor.author Zhang, Yongguang
dc.contributor.author Porcar-Castell, Albert
dc.contributor.author Joiner, Joanna
dc.contributor.author Guanter, Luis
dc.contributor.author Yang, Xi
dc.contributor.author Migliavacca, Mirco
dc.contributor.author Ju, Weimin
dc.contributor.author Sun, Zhigang
dc.contributor.author Chen, Shiping
dc.contributor.author Martini, David
dc.contributor.author Zhang, Qian
dc.contributor.author Li, Zhaohui
dc.contributor.author Cleverly, James
dc.contributor.author Wang, Hezhou
dc.contributor.author Goulas, Yves
dc.date.accessioned 2022-02-18T23:09:27Z
dc.date.available 2022-02-19T03:45:11Z
dc.date.issued 2020-04
dc.identifier.citation 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
dc.identifier.other PURE: 159281271
dc.identifier.other PURE UUID: 32da1539-157b-4872-bfa4-c7af199d4adf
dc.identifier.other WOS: 000523955300033
dc.identifier.uri http://hdl.handle.net/10138/340659
dc.description.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. en
dc.format.extent 17
dc.language.iso eng
dc.relation.ispartof Remote Sensing of Environment
dc.rights cc_by_nc_nd
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject Photosynthesis
dc.subject Photosynthetic pathway
dc.subject Chlorophyll fluorescence
dc.subject Canopy structure
dc.subject Spectral invariant theory
dc.subject SUN-INDUCED FLUORESCENCE
dc.subject GROSS PRIMARY PRODUCTION
dc.subject NET ECOSYSTEM EXCHANGE
dc.subject CARBON-DIOXIDE
dc.subject CANOPY PHOTOSYNTHESIS
dc.subject PRIMARY PRODUCTIVITY
dc.subject FEEDBACK MECHANISM
dc.subject ENERGY FLUXES
dc.subject CO2 UPTAKE
dc.subject MODEL
dc.subject 1172 Environmental sciences
dc.subject 1181 Ecology, evolutionary biology
dc.title Reduction of structural impacts and distinction of photosynthetic pathways in a global estimation of GPP from space-borne solar-induced chlorophyll fluorescence en
dc.type Article
dc.contributor.organization Viikki Plant Science Centre (ViPS)
dc.contributor.organization Department of Forest Sciences
dc.contributor.organization Ecosystem processes (INAR Forest Sciences)
dc.contributor.organization Forest Ecology and Management
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1016/j.rse.2020.111722
dc.relation.issn 0034-4257
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

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