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dc.contributor.authorde Wit, Heleen
dc.contributor.authorBryn, Anders
dc.contributor.authorHofgaard, Annika
dc.contributor.authorKarstensen, Jonas
dc.contributor.authorKvalevåg, Maria Malene
dc.contributor.authorPeters, Glen Philip
dc.date.accessioned2021-05-06T13:22:55Z
dc.date.available2021-05-06T13:22:55Z
dc.date.created2014-02-10T12:00:04Z
dc.date.issued2013
dc.identifier.citationGlobal Change Biology. 2013, 20 (7), 2344-2355.
dc.identifier.issn1354-1013
dc.identifier.urihttps://hdl.handle.net/11250/2753988
dc.description.abstractExpanding high elevation and high latitude forest has contrasting climate feedbacks through carbon sequestration (cooling) and reduced surface reflectance (warming), which are yet poorly quantified. Here, we present an empirically-based projection of mountain birch forest expansion in south-central Norway under climate change and absence of land use. Climate effects of carbon sequestration and albedo change are compared using four emission metrics. Forest expansion was modeled for a projected 2.6 °C increase of summer temperature in 2100, with associated reduced snow cover. We find that the current (year 2000) forest line of the region is circa 100 m lower than its climatic potential due to land use history. In the future scenarios, forest cover increased from 12 to 27% between 2000 and 2100, resulting in a 59% increase in biomass carbon storage and an albedo change from 0.46 to 0.30. Forest expansion in 2100 was behind its climatic potential, forest migration rates being the primary limiting factor. In 2100, the warming caused by lower albedo from expanding forest was 10 to 17 times stronger than the cooling effect from carbon sequestration for all emission metrics considered. Reduced snow cover further exacerbated the net warming feedback. The warming effect is considerably stronger than previously reported for boreal forest cover, because of the typically low biomass density in mountain forests and the large changes in albedo of snow-covered tundra areas. The positive climate feedback of high latitude and high elevation expanding mountain forests with seasonal snow cover exceeds those of afforestation at lower elevation, and calls for further attention of both modelers and empiricists. The inclusion and upscaling of these climate feedbacks from mountain forests into global models is warranted to assess the potential global impacts.
dc.description.abstractClimate warming feedback from mountain birch forest expansion: Reduced albedo dominates carbon uptake
dc.language.isoeng
dc.titleClimate warming feedback from mountain birch forest expansion: Reduced albedo dominates carbon uptake
dc.title.alternativeClimate warming feedback from mountain birch forest expansion: Reduced albedo dominates carbon uptake
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionacceptedVersion
dc.source.pagenumber2344-2355
dc.source.volume20
dc.source.journalGlobal Change Biology
dc.source.issue7
dc.identifier.doi10.1111/gcb.12483
dc.identifier.cristin1111421
dc.relation.projectNorges forskningsråd: 184681
dc.relation.projectNorges forskningsråd: 189977
dc.relation.projectNorges forskningsråd: 176065
cristin.unitcode7475,0,0,0
cristin.unitnameCICERO Senter for klimaforskning
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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