DOI: 10.1111/gcb.14137
Scopus记录号: 2-s2.0-85049525430
论文题名: Nongrowing season methane emissions–a significant component of annual emissions across northern ecosystems
作者: Treat C.C. ; Bloom A.A. ; Marushchak M.E.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 8 起始页码: 3331
结束页码: 3343
语种: 英语
英文关键词: boreal
; methane
; model-data comparison
; nongrowing season emissions
; peatlands
; synthesis
; tundra
; wetlands
Scopus关键词: annual variation
; bog
; boreal forest
; emission inventory
; methane
; temperate environment
; tundra
; upland region
; warming
; wetland
英文摘要: Wetlands are the single largest natural source of atmospheric methane (CH4), a greenhouse gas, and occur extensively in the northern hemisphere. Large discrepancies remain between “bottom-up” and “top-down” estimates of northern CH4 emissions. To explore whether these discrepancies are due to poor representation of nongrowing season CH4 emissions, we synthesized nongrowing season and annual CH4 flux measurements from temperate, boreal, and tundra wetlands and uplands. Median nongrowing season wetland emissions ranged from 0.9 g/m2 in bogs to 5.2 g/m2 in marshes and were dependent on moisture, vegetation, and permafrost. Annual wetland emissions ranged from 0.9 g m−2 year−1 in tundra bogs to 78 g m−2 year−1 in temperate marshes. Uplands varied from CH4 sinks to CH4 sources with a median annual flux of 0.0 ± 0.2 g m−2 year−1. The measured fraction of annual CH4 emissions during the nongrowing season (observed: 13% to 47%) was significantly larger than that was predicted by two process-based model ensembles, especially between 40° and 60°N (modeled: 4% to 17%). Constraining the model ensembles with the measured nongrowing fraction increased total nongrowing season and annual CH4 emissions. Using this constraint, the modeled nongrowing season wetland CH4 flux from >40° north was 6.1 ± 1.5 Tg/year, three times greater than the nongrowing season emissions of the unconstrained model ensemble. The annual wetland CH4 flux was 37 ± 7 Tg/year from the data-constrained model ensemble, 25% larger than the unconstrained ensemble. Considering nongrowing season processes is critical for accurately estimating CH4 emissions from high-latitude ecosystems, and necessary for constraining the role of wetland emissions in a warming climate. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110323
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, Finland; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Treat C.C.,Bloom A.A.,Marushchak M.E.. Nongrowing season methane emissions–a significant component of annual emissions across northern ecosystems[J]. Global Change Biology,2018-01-01,24(8)