Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/aa8c85 |
Warmer spring conditions increase annual methane emissions from a boreal peat landscape with sporadic permafrost | |
Helbig, Manuel1,2,4; Quinton, William L.3; Sonnentag, Oliver1,2 | |
2017-11-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2017 |
卷号 | 12期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | About a fifth of the global wetland methane emissions originate from boreal peatlands, which represent an important land cover type in boreal landscapes in the sporadic permafrost zone. There, rising air temperatures could lead to warmer spring and longer growing seasons, changing landscape methane emissions. To quantify the effect of warmer spring conditions on methane emissions of a boreal peat landscape in the sporadic permafrost zone of northwestern Canada, we analyzed four years (2013-2016) of methane fluxes measured with the eddy covariance technique and long-term (1951-2016) meteorological observations from a nearby climate station. In May, after snowmelt was complete, mean air temperatures were more than 2 degrees C warmer in 2013, 2015, and 2016 than in 2014. Mean growing season (May-August) air temperatures, in contrast, differed by less than 1 degrees C over the four years. WarmerMay air temperatures caused earlier wetland soil warming, with temperatures rising from similar to 0 degrees C to > 12 degrees C 25 to 40 days earlier and leading to similar to 6 degrees C warmer mean soil temperatures between May and June. However, from July to August, soil temperatures were similar among years. Mean May to August and annual methane emissions (6.4 g CH4 m(-2) and 9.4 g CH4 m(-2), respectively) of years with warmer spring (i.e. May) temperatures exceeded emissions during the cooler year by 20%-30% (4.5 g CH4 m(-2) and 7.2 g CH4 m(-2), respectively). Among years with warmer springs, growing season methane emissions varied little (+/- 0.5 g CH4 m(-2)). The observed interannual differences are most likely caused by a strong soil temperature control on methane fluxes and large soil temperature differences during the spring. Thus, in a warming climate, methane emissions from waterlogged boreal peat landscapes at the southern limit of permafrost are likely to increase in response to more frequent occurrences of warm springs. |
英文关键词 | methane peatland climate change permafrost soil temperature vegetation productiviy |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000415011000002 |
WOS关键词 | DIGITAL REPEAT PHOTOGRAPHY ; CLIMATE-CHANGE ; SOIL ; NORTHERN ; FLUXES ; TEMPERATURE ; THAW ; COVER ; PARAMETERIZATION ; FRAGMENTATION |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
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/31013 |
专题 | 气候变化 |
作者单位 | 1.Univ Montreal, Dept Geog, 520 Cote St Catherine Pavil, Montreal, PQ H2V 2B8, Canada; 2.Univ Laval, Ctr Etud Nord, Quebec City, PQ G1V 0A6, Canada; 3.Wilfrid Laurier Univ, Cold Reg Res Ctr, Waterloo, ON N2L 3C5, Canada; 4.McGill Univ, Dept Nat Resource Sci, Ste Anne De Bellevue, PQ H9X 3V9, Canada |
推荐引用方式 GB/T 7714 | Helbig, Manuel,Quinton, William L.,Sonnentag, Oliver. Warmer spring conditions increase annual methane emissions from a boreal peat landscape with sporadic permafrost[J]. ENVIRONMENTAL RESEARCH LETTERS,2017,12(11). |
APA | Helbig, Manuel,Quinton, William L.,&Sonnentag, Oliver.(2017).Warmer spring conditions increase annual methane emissions from a boreal peat landscape with sporadic permafrost.ENVIRONMENTAL RESEARCH LETTERS,12(11). |
MLA | Helbig, Manuel,et al."Warmer spring conditions increase annual methane emissions from a boreal peat landscape with sporadic permafrost".ENVIRONMENTAL RESEARCH LETTERS 12.11(2017). |
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