Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13520 |
The positive net radiative greenhouse gas forcing of increasing methane emissions from a thawing boreal forest-wetland landscape | |
Helbig, Manuel1,2; Chasmer, Laura E.3; Kljun, Natascha4; Quinton, William L.5; Treat, Claire C.6,7; Sonnentag, Oliver1,2 | |
2017-06-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; Wales; USA |
英文摘要 | At the southern margin of permafrost in North America, climate change causes widespread permafrost thaw. In boreal lowlands, thawing forested permafrost peat plateaus ('forest') lead to expansion of permafrost-free wetlands ('wetland'). Expanding wetland area with saturated and warmer organic soils is expected to increase landscape methane (CH4) emissions. Here, we quantify the thaw-induced increase in CH4 emissions for a boreal forest-wetland landscape in the southern Taiga Plains, Canada, and evaluate its impact on net radiative forcing relative to potential long-term net carbon dioxide (CO2) exchange. Using nested wetland and landscape eddy covariance net CH4 flux measurements in combination with flux footprint modeling, we find that landscape CH4 emissions increase with increasing wetland-to-forest ratio. Landscape CH4 emissions are most sensitive to this ratio during peak emission periods, when wetland soils are up to 10 degrees C warmer than forest soils. The cumulative growing season (May-October) wetland CH4 emission of similar to 13 g CH4 m(-2) is the dominating contribution to the landscape CH4 emission of similar to 7 g CH4 m(-2). In contrast, forest contributions to landscape CH4 emissions appear to be negligible. The rapid wetland expansion of 0.26 +/- 0.05% yr(-1) in this region causes an estimated growing season increase of 0.034 +/- 0.007 g CH4 m(-2) yr(-1) in landscape CH4 emissions. A long-term net CO2 uptake of >200 g CO2 m(-2) yr(-1) is required to offset the positive radiative forcing of increasing CH4 emissions until the end of the 21st century as indicated by an atmospheric CH4 and CO2 concentration model. However, long-term apparent carbon accumulation rates in similar boreal forest-wetland landscapes and eddy covariance landscape net CO2 flux measurements suggest a long-term net CO2 uptake between 49 and 157 g CO2 m(-2) yr(-1). Thus, thaw-induced CH4 emission increases likely exert a positive net radiative greenhouse gas forcing through the 21st century. |
英文关键词 | boreal forest carbon dioxide climate change eddy covariance methane radiative forcing wetland |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000400445900024 |
WOS关键词 | BLACK SPRUCE FOREST ; DISCONTINUOUS PERMAFROST ; CARBON-DIOXIDE ; NORTHERN PEATLAND ; CLIMATE-CHANGE ; NORTHWEST-TERRITORIES ; ECOSYSTEM RESPIRATION ; FLUX MEASUREMENTS ; HOLOCENE CARBON ; WATER-VAPOR |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17023 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Univ Montreal, Dept Geog, 520 Chemin Cote Sainte Catherine, Montreal, PQ H2V 2B8, Canada; 2.Univ Montreal, Ctr Etud Nord, 520 Chemin Cote Sainte Catherine, Montreal, PQ H2V 2B8, Canada; 3.Univ Lethbridge, Dept Geog, Lethbridge, AB T1K 3M4, Canada; 4.Swansea Univ, Dept Geog, Singleton Pk, Swansea SA2 8PP, W Glam, Wales; 5.Wilfrid Laurier Univ, Cold Reg Res Ctr, Waterloo, ON N2L 3C5, Canada; 6.Univ Alaska Fairbanks, Water & Environm Res Ctr, Fairbanks, AK 99775 USA; 7.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA |
推荐引用方式 GB/T 7714 | Helbig, Manuel,Chasmer, Laura E.,Kljun, Natascha,et al. The positive net radiative greenhouse gas forcing of increasing methane emissions from a thawing boreal forest-wetland landscape[J]. GLOBAL CHANGE BIOLOGY,2017,23(6). |
APA | Helbig, Manuel,Chasmer, Laura E.,Kljun, Natascha,Quinton, William L.,Treat, Claire C.,&Sonnentag, Oliver.(2017).The positive net radiative greenhouse gas forcing of increasing methane emissions from a thawing boreal forest-wetland landscape.GLOBAL CHANGE BIOLOGY,23(6). |
MLA | Helbig, Manuel,et al."The positive net radiative greenhouse gas forcing of increasing methane emissions from a thawing boreal forest-wetland landscape".GLOBAL CHANGE BIOLOGY 23.6(2017). |
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