Article Dans Une Revue Nature Geoscience Année : 2024

Global riverine land-to-ocean carbon export constrained by observations and multi-model assessment

Maodian Liu (1, 2) , Peter Raymond (2) , Ronny Lauerwald (3, 4) , Qianru Zhang (5, 1) , Gerrit Trapp-Müller (6) , Kay Davis (7) , Nils Moosdorf (8) , Changhao Xiao (9) , Jack Middelburg (6) , Alexander Bouwman (6) , Arthur Beusen (6) , Changhui Peng (10) , Fabrice Lacroix (11, 12) , Hanqin Tian (13) , Junjie Wang (6) , Mingxu Li (14) , Qiuan Zhu (15) , Sagy Cohen (16, 17) , Wim van Hoek (6) , Ya Li (18) , Yangmingkai Li (19) , Yuanzhi Yao (20) , Pierre Regnier (21)
1 Key Laboratory for Earth Surface Processes of the Ministry of Education
2 YSE - Yale School of the Environment
3 Université Paris-Saclay
4 ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes
5 Nicholas School of the Environment
6 Department of Earth Sciences [Amsterdam]
7 AIMS - Australian Institute of Marine Science
8 ZMT - Leibniz Centre for Tropical Marine Research
9 College of Urban and Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of Education
10 UQAM - Université du Québec à Montréal = University of Québec in Montréal
11 BFH - Bern University of Applied Sciences
12 OCCR - Oeschger Centre for Climate Change Research
13 BC - Boston College
14 CAAS - Chinese Academy of Agricultural Sciences
15 Hohai University
16 Department of Geography and the Human Environment
17 UA - University of Alabama [Tuscaloosa]
18 Research Center for Eco-Environmental Sciences
19 Key Laboratory for Earth Surface Processes of the Ministry of Education, Institute of Ecology, College of Urban and Environmental Science, Peking University
20 ECNU - East China Normal University [Shangaï]
21 ULB - Université libre de Bruxelles
Maodian Liu
Key Laboratory for Earth Surface Processes of the Ministry of Education
Yale School of the Environment
Peter Raymond
Yale School of the Environment
Ronny Lauerwald
Université Paris-Saclay
Ecologie fonctionnelle et écotoxicologie des agroécosystèmes
CV
Qianru Zhang
Nicholas School of the Environment
Key Laboratory for Earth Surface Processes of the Ministry of Education
Gerrit Trapp-Müller
Department of Earth Sciences [Amsterdam]
Kay Davis
Australian Institute of Marine Science
Nils Moosdorf
Leibniz Centre for Tropical Marine Research
Changhao Xiao
  • Fonction : Auteur
College of Urban and Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of Education
Jack Middelburg
Department of Earth Sciences [Amsterdam]
Alexander Bouwman
Department of Earth Sciences [Amsterdam]
Arthur Beusen
Department of Earth Sciences [Amsterdam]
Changhui Peng
Université du Québec à Montréal = University of Québec in Montréal
Fabrice Lacroix
Bern University of Applied Sciences
Oeschger Centre for Climate Change Research
Hanqin Tian
Boston College
Junjie Wang
Department of Earth Sciences [Amsterdam]
Mingxu Li
  • Fonction : Auteur
Chinese Academy of Agricultural Sciences
Qiuan Zhu
Hohai University
Sagy Cohen
Department of Geography and the Human Environment
University of Alabama [Tuscaloosa]
Wim van Hoek
  • Fonction : Auteur
Department of Earth Sciences [Amsterdam]
Ya Li
Research Center for Eco-Environmental Sciences
Yangmingkai Li
Key Laboratory for Earth Surface Processes of the Ministry of Education, Institute of Ecology, College of Urban and Environmental Science, Peking University
Yuanzhi Yao
  • Fonction : Auteur
East China Normal University [Shangaï]
Pierre Regnier
Université libre de Bruxelles

Résumé

Rivers are a key component of the global carbon cycle. They receive vast quantities of terrestrial carbon, of which a large fraction is ultimately exported to the coastal ocean. Our review of previously published assessments reveals that substantial uncertainties remain with regard to the spatial distribution and speciation of the carbon export. Accurate quantification of the relative contributions of dissolved, particulate, organic and inorganic carbon to the total amounts is, however, of crucial importance for the coupling between the terrestrial and marine carbon cycles. Breaking down existing spatially explicit assessments over large river basins, we find a disagreement in flux estimates that exceeds two orders of magnitude for more than half of the basins. Using machine-learning techniques in combination with a multi-model ensemble and an updated database of observations, we overcome the inconsistencies in existing assessments and narrow down uncertainties in riverine carbon exports. Our revised assessment yields a global riverine export of 1.02 ± 0.22 (2σ) PgC yr−1. This carbon flux is partitioned into 0.52 ± 0.17, 0.30 ± 0.14, 0.18 ± 0.04 and 0.03 ± 0.02 PgC yr−1 of dissolved inorganic, dissolved organic, particulate organic and particulate inorganic carbon, respectively. We estimate the carbon contribution through groundwater export to be minor (0.016 PgC yr−1). Our assessment suggests an underestimation of the land-to-ocean carbon flux by 0.24 PgC yr−1 by the Intergovernmental Panel on Climate Change (IPCC) and calls for a revision of the oceanic carbon budget.

Domaines

Sciences de l'environnement

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https://hal.inrae.fr/hal-04842128

Soumis le : mardi 17 décembre 2024-09:20:10

Dernière modification le : vendredi 10 janvier 2025-10:13:03

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Dates et versions

hal-04842128 , version 1 (17-12-2024)

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Citer

Maodian Liu, Peter Raymond, Ronny Lauerwald, Qianru Zhang, Gerrit Trapp-Müller, et al.. Global riverine land-to-ocean carbon export constrained by observations and multi-model assessment. Nature Geoscience, 2024, 17 (9), pp.896-904. ⟨10.1038/s41561-024-01524-z⟩. ⟨hal-04842128⟩

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