Publikationsdatum:
2018-08-30
Beschreibung:
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
Repository-Name:
EPIC Alfred Wegener Institut
Materialart:
Article
,
isiRev
Permalink