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Article Dans Une Revue Global Change Biology Année : 2023

Modeled production, oxidation, and transport processes of wetland methane emissions in temperate, boreal, and Arctic regions

1 Osaka Metropolitan University
2 University of British Columbia [Vancouver]
3 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
4 ESPM - Department of Environmental Science, Policy, and Management [Berkeley]
5 US Geological Survey [Jamestown]
6 Prairie and Northern Wildlife Research Centre
7 Climate and Ecosystem Sciences Division
8 Research Faculty of Agriculture
9 Hokkaido University [Sapporo, Japan]
10 UIC - University of Illinois [Chicago]
11 EAES - Department of Earth and Environmental Sciences [Chicago]
12 Rutgers University [Newark]
13 Department of Earth and Environmental Science [Newark]
14 US Geological Survey [Menlo Park]
15 GSFC - NASA Goddard Space Flight Center
16 Biospheric Sciences Laboratory
17 ESS - Department of Earth System Science [Stanford]
18 Stanford University
19 Michigan State University System
20 University of Wisconsin-Madison
21 Department of Atmospheric and Oceanic Sciences [Madison]
22 UR - Université de Rennes
23 ECOBIO - Ecosystèmes, biodiversité, évolution [Rennes]
24 Shinshu University [Nagano]
25 National Center for Agro-Meteorology
26 Helsingin yliopisto = Helsingfors universitet = University of Helsinki
27 SLU - Swedish University of Agricultural Sciences = Sveriges lantbruksuniversitet
28 Department of Forest Ecology and Management
29 UdeM - Université de Montréal
30 University of Eastern Finland
31 School of Forest Sciences
32 SNU - Seoul National University [Seoul]
33 Department of Landscape Architecture and Rural Systems Engineering
34 Institute of Arctic Biology
35 UAF - University of Alaska [Fairbanks]
36 MPI-BGC - Max Planck Institute for Biogeochemistry
37 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
38 SAS - Sol Agro et hydrosystème Spatialisation
39 GFZ - German Research Centre for Geosciences - Helmholtz-Centre Potsdam
Masahito Ueyama
Sara H Knox
Jiquen Chen
Hiroki Iwata
Minseok Kang
Oliver Sonnentag

Résumé

Wetlands are the largest natural source of methane (CH4) to the atmosphere. The eddy covariance method provides robust measurements of net ecosystem exchange of CH4, but interpreting its spatiotemporal variations is challenging due to the co-occurrence of CH4 production, oxidation, and transport dynamics. Here, we estimate these three processes using a data-model fusion approach across 25 wetlands in temperate, boreal, and Arctic regions. Our data-constrained model—iPEACE—reasonably reproduced CH4 emissions at 19 of the 25 sites with normalized root mean square error of 0.59, correlation coefficient of 0.82, and normalized standard deviation of 0.87. Among the three processes, CH4 production appeared to be the most important process, followed by oxidation in explaining inter-site variations in CH4 emissions. Based on a sensitivity analysis, CH4 emissions were generally more sensitive to decreased water table than to increased gross primary productivity or soil temperature. For periods with leaf area index (LAI) of ≥20% of its annual peak, plant-mediated transport appeared to be the major pathway for CH4 transport. Contributions from ebullition and diffusion were relatively high during low LAI (<20%) periods. The lag time between CH4 production and CH4 emissions tended to be short in fen sites (3 ± 2 days) and long in bog sites (13 ± 10 days). Based on a principal component analysis, we found that parameters for CH4 production, plant-mediated transport, and diffusion through water explained 77% of the variance in the parameters across the 19 sites, highlighting the importance of these parameters for predicting wetland CH4 emissions across biomes. These processes and associated parameters for CH4 emissions among and within the wetlands provide useful insights for interpreting observed net CH4 fluxes, estimating sensitivities to biophysical variables, and modeling global CH4 fluxes.
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Dates et versions

hal-03955531 , version 1 (25-01-2023)

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Paternité

Identifiants

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Masahito Ueyama, Sara H Knox, Kyle B Delwiche, Sheel Bansal, William J Riley, et al.. Modeled production, oxidation, and transport processes of wetland methane emissions in temperate, boreal, and Arctic regions. Global Change Biology, 2023, 29 (8), pp.2313-2334. ⟨10.1111/gcb.16594⟩. ⟨hal-03955531⟩
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