Increasing coastal slump activity impacts the release of sediment and organic carbon into the Arctic Ocean
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Published:2018-03-13
Issue:5
Volume:15
Page:1483-1495
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Ramage Justine L.ORCID, Irrgang Anna M., Morgenstern Anne, Lantuit HuguesORCID
Abstract
Abstract. Retrogressive thaw slumps (RTSs) are among the most active
thermokarst landforms in the Arctic and deliver a large amount of material
to the Arctic Ocean. However, their contribution to the organic carbon (OC)
budget is unknown. We provide the first estimate of the contribution of RTSs
to the nearshore OC budget of the Yukon Coast, Canada, and describe the
evolution of coastal RTSs between 1952 and 2011 in this area. We (1) describe
the evolution of RTSs between 1952 and 2011; (2) calculate the volume of
eroded material and stocks of OC mobilized through slumping, including soil
organic carbon (SOC) and dissolved organic carbon (DOC); and (3) estimate the OC
fluxes mobilized through slumping between 1972 and 2011. We identified RTSs
using high-resolution satellite imagery from 2011 and geocoded aerial
photographs from 1952 and 1972. To estimate the volume of eroded material,
we applied spline interpolation on an airborne lidar dataset acquired in
July 2013. We inferred the stocks of mobilized SOC and DOC from existing
related literature. Our results show a 73 % increase in the number of RTSs
and 14 % areal expansion between 1952 and 2011. In the study area, RTSs
displaced at least 16.6×106 m3 of material, 53 % of which was
ice, and mobilized 145.9×106 kg of OC. Between 1972 and 2011, 49 RTSs
displaced 8.6×103 m3 yr−1 of material, adding 0.6 % to the OC flux
released by coastal retreat along the Yukon Coast. Our results show that the
contribution of RTSs to the nearshore OC budget is non-negligible and should
be included when estimating the quantity of OC released from the Arctic
coast to the ocean.
Funder
Helmholtz-Gemeinschaft
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
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