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@prefix dcterms: <http://purl.org/dc/terms/> . @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . @prefix gcis: <http://data.globalchange.gov/gcis.owl#> . @prefix cito: <http://purl.org/spar/cito/> . @prefix biro: <http://purl.org/spar/biro/> . <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/terrestrial-wetlands/finding/key-message-13-2> dcterms:identifier "key-message-13-2"; gcis:findingNumber "13.2"^^xsd:string; gcis:findingStatement "North American terrestrial wetlands currently are a carbon dioxide sink of about 123 teragrams of carbon (Tg C) per year, with approximately 53% occurring in forested systems. However, North American terrestrial wetlands are a natural source of methane (CH<sub>4</sub>), with mineral soil wetlands emitting 56% of the estimated total of 45 Tg C as CH<sub>4</sub> (CH<sub>4</sub> –C) per year <em>(medium confidence, likely)</em>."^^xsd:string; gcis:isFindingOf <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/terrestrial-wetlands>; gcis:isFindingOf <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report>; ## Properties of the finding: gcis:descriptionOfEvidenceBase "Key Finding 2 and this chapter’s narrative are based on the most recently reported wetland inventories integrated with reported values of soil carbon density (mass per unit area) and gaseous fluxes of carbon dioxide (CO<sub>2</sub>) and CH<sub>4</sub>. Accordingly, the projections are dependent on estimates of wetland area and the pool and flux values assigned to the wetland types (see Appendices 13A and 13B)."^^xsd:string; gcis:assessmentOfConfidenceBasedOnEvidence "Confidence is medium, given both the incompleteness in mapping and variability in flux rates."^^xsd:string; gcis:newInformationAndRemainingUncertainties "Major uncertainties Similar to Key Finding 1, one major uncertainty is the mapped area, especially in areas with considerable wetlands that have not been adequately mapped. A second important uncertainty are the flux rates, which are applied globally to wetland types but are highly variable in time and space. Moreover, in many cases, few data exist."^^xsd:string; a gcis:Finding . ## This finding cites the following entities: <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/terrestrial-wetlands/finding/key-message-13-2> prov:wasDerivedFrom <https://data.globalchange.gov/report/second-state-carbon-cycle-report-soccr2-sustained-assessment-report/chapter/preface/figure/figurep-4>.