Carbonyl sulfide : comparing a mechanistic representation of the vegetation uptake in a land surface model and the leaf relative uptake approach

Show simple item record Maignan, Fabienne Abadie, Camille Remaud, Marine Kooijmans, Linda M. J. Kohonen, Kukka-Maaria Commane, Róisín Wehr, Richard Campbell, J. Elliott Belviso, Sauveur Montzka, Stephen A. Raoult, Nina Seibt, Ulli Shiga, Yoichi P. Vuichard, Nicolas Whelan, Mary E. Peylin, Philippe 2021-05-27T14:30:01Z 2021-05-27T14:30:01Z 2021-05-12
dc.identifier.citation Maignan , F , Abadie , C , Remaud , M , Kooijmans , L M J , Kohonen , K-M , Commane , R , Wehr , R , Campbell , J E , Belviso , S , Montzka , S A , Raoult , N , Seibt , U , Shiga , Y P , Vuichard , N , Whelan , M E & Peylin , P 2021 , ' Carbonyl sulfide : comparing a mechanistic representation of the vegetation uptake in a land surface model and the leaf relative uptake approach ' , Biogeosciences , vol. 18 , no. 9 , pp. 2917–2955 .
dc.identifier.other PURE: 164077974
dc.identifier.other PURE UUID: 7c5a33e1-a14d-4248-b407-5329acf388cd
dc.identifier.other WOS: 000651605200001
dc.identifier.other ORCID: /0000-0001-9258-1225/work/94564033
dc.identifier.other Scopus: 85105812378
dc.description.abstract Land surface modellers need measurable proxies to constrain the quantity of carbon dioxide (CO2) assimilated by continental plants through photosynthesis, known as gross primary production (GPP). Carbonyl sulfide (COS), which is taken up by leaves through their stomates and then hydrolysed by photosynthetic enzymes, is a candidate GPP proxy. A former study with the ORCHIDEE land surface model used a fixed ratio of COS uptake to CO2 uptake normalised to respective ambient concentrations for each vegetation type (leaf relative uptake, LRU) to compute vegetation COS fluxes from GPP. The LRU approach is known to have limited accuracy since the LRU ratio changes with variables such as photosynthetically active radiation (PAR): while CO2 uptake slows under low light, COS uptake is not light limited. However, the LRU approach has been popular for COS-GPP proxy studies because of its ease of application and apparent low contribution to uncertainty for regional-scale applications. In this study we refined the COS-GPP relationship and implemented in ORCHIDEE a mechanistic model that describes COS uptake by continental vegetation. We compared the simulated COS fluxes against measured hourly COS fluxes at two sites and studied the model behaviour and links with environmental drivers. We performed simulations at a global scale, and we estimated the global COS uptake by vegetation to be -756 Gg S yr(-1) , in the middle range of former studies (-490 to -1335 Gg S yr(-1)). Based on monthly mean fluxes simulated by the mechanistic approach in ORCHIDEE, we derived new LRU values for the different vegetation types, ranging between 0.92 and 1.72, close to recently published averages for observed values of 1.21 for C-4 and 1.68 for C-3 plants. We transported the COS using the monthly vegetation COS fluxes derived from both the mechanistic and the LRU approaches, and we evaluated the simulated COS concentrations at NOAA sites. Although the mechanistic approach was more appropriate when comparing to high-temporal-resolution COS flux measurements, both approaches gave similar results when transporting with monthly COS fluxes and evaluating COS concentrations at stations. In our study, uncertainties between these two approaches are of secondary importance compared to the uncertainties in the COS global budget, which are currently a limiting factor to the potential of COS concentrations to constrain GPP simulated by land surface models on the global scale. en
dc.format.extent 39
dc.language.iso eng
dc.relation.ispartof Biogeosciences
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 1181 Ecology, evolutionary biology
dc.subject 1172 Environmental sciences
dc.subject 1171 Geosciences
dc.subject GAS-EXCHANGE
dc.subject CO2
dc.subject DIOXIDE
dc.title Carbonyl sulfide : comparing a mechanistic representation of the vegetation uptake in a land surface model and the leaf relative uptake approach en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization Institute for Atmospheric and Earth System Research (INAR)
dc.contributor.organization Micrometeorology and biogeochemical cycles
dc.description.reviewstatus Peer reviewed
dc.relation.issn 1726-4170
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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