DOI: 10.1002/2015GB005337
Scopus记录号: 2-s2.0-84978852691
论文题名: Eroding permafrost coasts release low amounts of dissolved organic carbon (DOC) from ground ice into the nearshore zone of the Arctic Ocean
作者: Tanski G ; , Couture N ; , Lantuit H ; , Eulenburg A ; , Fritz M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 7 起始页码: 1054
结束页码: 1068
语种: 英语
英文关键词: Arctic
; biogeochemistry
; carbon cycle
; coastal erosion
; permafrost
Scopus关键词: bioavailability
; biogeochemistry
; carbon budget
; carbon flux
; carbon sequestration
; coastal erosion
; dissolved organic carbon
; nearshore environment
; organic carbon
; particulate organic carbon
; permafrost
; river basin
; river discharge
; soil carbon
; stratification
; Arctic Ocean
; Canada
; Canadian Arctic
英文摘要: Ice-rich permafrost coasts in the Arctic are highly sensitive to climate warming and erode at a pace that exceeds the global average. Permafrost coasts deliver vast amounts of organic carbon into the nearshore zone of the Arctic Ocean. Numbers on flux exist for particulate organic carbon (POC) and total or soil organic carbon (TOC, SOC). However, they do not exist for dissolved organic carbon (DOC), which is known to be highly bioavailable. This study aims to estimate DOC stocks in coastal permafrost as well as the annual flux into the ocean. DOC concentrations in ground ice were analyzed along the ice-rich Yukon coast (YC) in the western Canadian Arctic. The annual DOC flux was estimated using available numbers for coast length, cliff height, annual erosion rate, and volumetric ice content in different stratigraphic horizons. Our results showed that DOC concentrations in ground ice range between 0.3 and 347.0 mg L−1 with an estimated stock of 13.6 ± 3.0 g m−3 along the YC. An annual DOC flux of 54.9 ± 0.9 Mg yr−1 was computed. These DOC fluxes are low compared to POC and SOC fluxes from coastal erosion or POC and DOC fluxes from Arctic rivers. We conclude that DOC fluxes from permafrost coasts play a secondary role in the Arctic carbon budget. However, this DOC is assumed to be highly bioavailable. We hypothesize that DOC from coastal erosion is important for ecosystems in the Arctic nearshore zones, particularly in summer when river discharge is low, and in areas where rivers are absent. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77838
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Periglacial Research Unit, Potsdam, Germany; University of Potsdam, Institute of Earth and Environmental Sciences, Potsdam, Germany; Natural Resources Canada, Ottawa, Canada
Recommended Citation:
Tanski G,, Couture N,, Lantuit H,et al. Eroding permafrost coasts release low amounts of dissolved organic carbon (DOC) from ground ice into the nearshore zone of the Arctic Ocean[J]. Global Biogeochemical Cycles,2016-01-01,30(7)