globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13520
论文题名:
The positive net radiative greenhouse gas forcing of increasing methane emissions from a thawing boreal forest-wetland landscape
作者: Helbig M.; Chasmer L.E.; Kljun N.; Quinton W.L.; Treat C.C.; Sonnentag O.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期:6
起始页码: 2413
结束页码: 2427
语种: 英语
英文关键词: boreal forest ; carbon dioxide ; climate change ; eddy covariance ; methane ; radiative forcing ; wetland
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 °C warmer than forest soils. The cumulative growing season (May–October) wetland CH4 emission of ~13 g CH4 m−2 is the dominating contribution to the landscape CH4 emission of ~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. © 2016 John Wiley & Sons Ltd
资助项目: Helbig, M. ; Département de Géographie, Université de Montréal & Centre d’études nordiques, 520 Chemin de la Côte Sainte-Catherine, Canada ; 电子邮件: manuel.helbig@umontreal.ca
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60946
Appears in Collections:影响、适应和脆弱性

Files in This Item:

There are no files associated with this item.


作者单位: Département de Géographie, Université de Montréal & Centre d’études nordiques, 520 Chemin de la Côte Sainte-Catherine, Montréal, QC, Canada; Department of Geography, University of Lethbridge, Lethbridge, AB, Canada; Department of Geography, Swansea University, Singleton Park, Swansea, United Kingdom; Cold Regions Research Centre, Wilfrid Laurier University, Waterloo, ON, Canada; Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States; U.S. Geological Survey, Menlo Park, CA, United States

Recommended Citation:
Helbig M.,Chasmer L.E.,Kljun N.,et al. The positive net radiative greenhouse gas forcing of increasing methane emissions from a thawing boreal forest-wetland landscape[J]. Global Change Biology,2017-01-01,23(6)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Helbig M.]'s Articles
[Chasmer L.E.]'s Articles
[Kljun N.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Helbig M.]'s Articles
[Chasmer L.E.]'s Articles
[Kljun N.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Helbig M.]‘s Articles
[Chasmer L.E.]‘s Articles
[Kljun N.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.