DOI: 10.1002/2017JG004166
Scopus记录号: 2-s2.0-85042116237
论文题名: Coastal Erosion of Permafrost Soils Along the Yukon Coastal Plain and Fluxes of Organic Carbon to the Canadian Beaufort Sea
作者: Couture N.J. ; Irrgang A. ; Pollard W. ; Lantuit H. ; Fritz M.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 2 起始页码: 406
结束页码: 422
语种: 英语
英文关键词: Canadian Beaufort Sea
; coastal erosion
; ground ice
; organic carbon
; Yukon
Scopus关键词: carbon cycle
; carbon flux
; coastal erosion
; environmental change
; ground freezing
; nearshore environment
; organic carbon
; permafrost
; sediment transport
; sedimentation rate
; soil erosion
; Arctic Ocean
; Beaufort Sea
; Canada
; Yukon Territory
英文摘要: Reducing uncertainties about carbon cycling is important in the Arctic where rapid environmental changes contribute to enhanced mobilization of carbon. Here we quantify soil organic carbon (SOC) contents of permafrost soils along the Yukon Coastal Plain and determine the annual fluxes from coastal erosion. Different terrain units were assessed based on surficial geology, morphology, and ground ice conditions. To account for the volume of wedge ice and massive ice in a unit, SOC contents were reduced by 19% and sediment contents by 16%. The SOC content in a 1 m2 column of soil varied according to the height of the bluff, ranging from 30 to 662 kg, with a mean value of 183 kg. Forty-four per cent of the SOC was within the top 1 m of soil and values varied based on surficial materials, ranging from 30 to 53 kg C/m3, with a mean of 41 kg. Eighty per cent of the shoreline was erosive with a mean annual rate of change of −0.7 m/yr. This resulted in a SOC flux per meter of shoreline of 132 kg C/m/yr, and a total flux for the entire 282 km of the Yukon coast of 35.5 × 106 kg C/yr (0.036 Tg C/yr). The mean flux of sediment per meter of shoreline was 5.3 × 103 kg/m/yr, with a total flux of 1,832 × 106 kg/yr (1.832 Tg/yr). Sedimentation rates indicate that approximately 13% of the eroded carbon was sequestered in nearshore sediments, where the overwhelming majority of organic carbon was of terrestrial origin. ©2018. American Geophysical Union and Her Majesty the Queen in Right of Canada. Reproduced with the permission of the Minister of Natural Resources Canada. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114501
Appears in Collections: 气候减缓与适应
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作者单位: Geological Survey of Canada, Natural Resources Canada, Ottawa, ON, Canada; Department of Geography, McGill University, Montreal, QC, Canada; Department of Periglacial Research, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany; Institute of Earth and Environmental Science Potsdam, University of Potsdam, Potsdam, Germany
Recommended Citation:
Couture N.J.,Irrgang A.,Pollard W.,et al. Coastal Erosion of Permafrost Soils Along the Yukon Coastal Plain and Fluxes of Organic Carbon to the Canadian Beaufort Sea[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(2)