Climate warming feedback from mountain birch forest expansion : reduced albedo dominates carbon uptake

© 2013 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 20(2014), 7 vom: 01. Juli, Seite 2344-55
1. Verfasser: de Wit, Heleen A (VerfasserIn)
Weitere Verfasser: Bryn, Anders, Hofgaard, Annika, Karstensen, Jonas, Kvalevåg, Maria M, Peters, Glen P
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2014
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article Research Support, Non-U.S. Gov't albedo carbon sequestration climate feedback climate warming forest expansion mountain birch snow cover tundra mehr... Carbon 7440-44-0
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520 |a Expanding 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 in 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 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 
650 4 |a Journal Article 
650 4 |a Research Support, Non-U.S. Gov't 
650 4 |a albedo 
650 4 |a carbon sequestration 
650 4 |a climate feedback 
650 4 |a climate warming 
650 4 |a forest expansion 
650 4 |a mountain birch 
650 4 |a snow cover 
650 4 |a tundra 
650 7 |a Carbon  |2 NLM 
650 7 |a 7440-44-0  |2 NLM 
700 1 |a Bryn, Anders  |e verfasserin  |4 aut 
700 1 |a Hofgaard, Annika  |e verfasserin  |4 aut 
700 1 |a Karstensen, Jonas  |e verfasserin  |4 aut 
700 1 |a Kvalevåg, Maria M  |e verfasserin  |4 aut 
700 1 |a Peters, Glen P  |e verfasserin  |4 aut 
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773 1 8 |g volume:20  |g year:2014  |g number:7  |g day:01  |g month:07  |g pages:2344-55 
856 4 0 |u http://dx.doi.org/10.1111/gcb.12483  |3 Volltext 
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