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dc.contributor.authorTreat, Claire C
dc.contributor.authorBloom, Anthony A
dc.contributor.authorMarushchak, Maija E
dc.date.accessioned2018-05-14T09:21:51Z
dc.date.available2018-05-14T09:21:51Z
dc.date.issued2018
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/6596
dc.description.abstractWetlands are the single largest natural source of atmospheric methane (CH4), a greenhouse gas, and occur extensively in the northern hemisphere. Large discrepancies remain between “bottom‐up” and “top‐down” estimates of northern CH4 emissions. To explore whether these discrepancies are due to poor representation of nongrowing season CH4 emissions, we synthesized nongrowing season and annual CH4 flux measurements from temperate, boreal, and tundra wetlands and uplands. Median nongrowing season wetland emissions ranged from 0.9 g/m2 in bogs to 5.2 g/m2 in marshes and were dependent on moisture, vegetation, and permafrost. Annual wetland emissions ranged from 0.9 g m−2 year−1 in tundra bogs to 78 g m−2 year−1 in temperate marshes. Uplands varied from CH4 sinks to CH4 sources with a median annual flux of 0.0 ± 0.2 g m−2 year−1. The measured fraction of annual CH4 emissions during the nongrowing season (observed: 13% to 47%) was significantly larger than that was predicted by two process‐based model ensembles, especially between 40° and 60°N (modeled: 4% to 17%). Constraining the model ensembles with the measured nongrowing fraction increased total nongrowing season and annual CH4 emissions. Using this constraint, the modeled nongrowing season wetland CH4 flux from >40° north was 6.1 ± 1.5 Tg/year, three times greater than the nongrowing season emissions of the unconstrained model ensemble. The annual wetland CH4 flux was 37 ± 7 Tg/year from the data‐constrained model ensemble, 25% larger than the unconstrained ensemble. Considering nongrowing season processes is critical for accurately estimating CH4 emissions from high‐latitude ecosystems, and necessary for constraining the role of wetland emissions in a warming climate.
dc.language.isoEN
dc.publisherWiley
dc.relation.ispartofseriesGLOBAL CHANGE BIOLOGY
dc.relation.urihttp://dx.doi.org/10.1111/gcb.14137
dc.rightsCC BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleNongrowing season methane emissions - a significant component of annual emissions across northern ecosystems
dc.description.versionfinal draft
dc.contributor.departmentYmpäristö- ja biotieteiden laitos / Toiminta
uef.solecris.id54338197en
dc.type.publicationTieteelliset aikakauslehtiartikkelit
dc.rights.accessrights© John Wiley & Sons Ltd
dc.relation.doi10.1111/gcb.14137
dc.description.reviewstatuspeerReviewed
dc.relation.issn1354-1013
dc.relation.volume[First published 22 Mar 2018]
dc.rights.accesslevelopenAccess
dc.type.okmA1
uef.solecris.openaccessEi


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