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• W4200178510 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> In the global methane budget, the largest natural source is attributed to wetlands, which encompass all ecosystems composed of waterlogged or inundated ground, capable of methane production. Among them, northern peatlands that store large amounts of soil organic carbon have been functioning, since the end of the last glaciation period, as long-term sources of methane (CH<span class=inline-formula>₄</span>) and are one of the most significant methane sources among wetlands. To reduce uncertainty of quantifying methane flux in the global methane budget, it is of significance to understand the underlying processes for methane production and fluxes in northern peatlands. A methane model that features methane production and transport by plants, ebullition process and diffusion in soil, oxidation to CO<span class=inline-formula>₂</span>, and CH<span class=inline-formula>₄</span> fluxes to the atmosphere has been embedded in the ORCHIDEE-PEAT land surface model that includes an explicit representation of northern peatlands. ORCHIDEE-PCH<span class=inline-formula>₄</span> was calibrated and evaluated on 14 peatland sites distributed on both the Eurasian and American continents in the northern boreal and temperate regions. Data assimilation approaches were employed to optimized parameters at each site and at all sites simultaneously. Results show that methanogenesis is sensitive to temperature and substrate availability over the top 75 cm of soil depth. Methane emissions estimated using single site optimization (SSO) of model parameters are underestimated by 9 g CH<span class=inline-formula>₄</span> m<span class=inline-formula>^−2</span> yr<span class=inline-formula>^−1</span> on average (i.e., 50 % higher than the site average of yearly methane emissions). While using the multi-site optimization (MSO), methane emissions are overestimated by 5 g CH<span class=inline-formula>₄</span> m<span class=inline-formula>^−2</span> yr<span class=inline-formula>^−1</span> on average across all investigated sites (i.e., 37 % lower than the site average of yearly methane emissions)." @default.
• W4200178510 created "2021-12-31" @default.
• W4200178510 date "2021-11-17" @default.
• W4200178510 modified "2023-10-15" @default.
• W4200178510 title "Comment on gmd-2021-280" @default.
• W4200178510 doi "https://doi.org/10.5194/gmd-2021-280-rc1" @default.
• W4200178510 hasPublicationYear "2021" @default.
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