DOI: 10.1111/gcb.12483
论文题名: Climate warming feedback from mountain birch forest expansion: Reduced albedo dominates carbon uptake
作者: De Wit H.A. ; Bryn A. ; Hofgaard A. ; Karstensen J. ; Kvalevåg M.M. ; Peters G.P.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 7 起始页码: 2344
结束页码: 2355
语种: 英语
英文关键词: Albedo
; Carbon sequestration
; Climate feedback
; Climate warming
; Forest expansion
; Mountain birch
; Snow cover
; Tundra
Scopus关键词: albedo
; biomass
; carbon sequestration
; climate change
; climate effect
; climate feedback
; forest dynamics
; global warming
; snow cover
; tundra
; Norway
; Betula pubescens subsp. tortuosa
; carbon
; snow
; animal husbandry
; biomass
; birch
; climate change
; environment
; forest
; metabolism
; Norway
; physiology
; season
; temperature
; theoretical model
; tree
; Animal Husbandry
; Betula
; Biomass
; Carbon
; Climate Change
; Environment
; Forests
; Models, Theoretical
; Norway
; Seasons
; Snow
; Temperature
; Trees
英文摘要: 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. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62197
Appears in Collections: 影响、适应和脆弱性
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作者单位: Norwegian Institute for Water Research, Gaustadalléen 21, Oslo, NO-0349, Norway; Norwegian Forest and Landscape Institute, PB 115, Ås, NO-1431, Norway; Norwegian Institute for Nature Research, PB 5685 Sluppen, Trondheim, NO-7485, Norway; Center for International Climate and Environmental Research - Oslo (CICERO), PB 1129, Blindern, Oslo, NO-0318, Norway; Natural History Museum, University of Oslo, PB 1172, Blindern, Oslo, NO-0318, Norway
Recommended Citation:
De Wit H.A.,Bryn A.,Hofgaard A.,et al. Climate warming feedback from mountain birch forest expansion: Reduced albedo dominates carbon uptake[J]. Global Change Biology,2014-01-01,20(7)