A 100-year record of changes in water renewal rate in Sermilik Fjord and its influence on calving of Helheim Glacier, Southeast Greenland

Here we present a 100 year long proxy record for the renewal rate of the subsurface ocean waters in Sermilik Fjord at the edge of Helheim Glacier, based on investigations of two sediment cores (ER11-24 and ER11-25) obtained from the head of the fjord. By calculating the mean sortable silt ((SS) over...

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Bibliographic Details
Published in:Continental Shelf Research
Main Authors: Andresen, Camilla S., Schmidt, S., Seidenkrantz, Marit-Solveig, Straneo, F., Grycel, A., Hass, C, Kjær, K.H., Nørgaard-Pedersen, N., Dyke, L.M., Olsen, Jesper, Kuijpers, A.
Format: Article in Journal/Newspaper
Language:English
Published: 2014
Subjects:
SE Greenland
Outlet glaciers
Fjord circulation
Glacial plume sedimentation
Ice-ocean interactions
North Atlantic oscillation
EAST GREENLAND
ICE-SHEET
SEDIMENT DEPOSITION
JAKOBSHAVN ISBRAE
BARRIER WINDS
VARIABILITY
CIRCULATION
CLIMATOLOGY
East Greenland
glacier
Greenland
Ice Sheet
Jakobshavn
North Atlantic
Sermilik
Online Access:https://pure.au.dk/portal/da/publications/a-100year-record-of-changes-in-water-renewal-rate-in-sermilik-fjord-and-its-influence-on-calving-of-helheim-glacier-southeast-greenland(e71c6c16-7563-4d9e-bf1f-3d15afbb13a7).html
https://doi.org/10.1016/j.csr.2014.05.017
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Summary:Here we present a 100 year long proxy record for the renewal rate of the subsurface ocean waters in Sermilik Fjord at the edge of Helheim Glacier, based on investigations of two sediment cores (ER11-24 and ER11-25) obtained from the head of the fjord. By calculating the mean sortable silt ((SS) over bar) in current-sorted melt water plume sediments we find that episodes of increased water renewal rates lasting 3-5 years coincide with a positive North Atlantic Oscillation (NAO) index. This is not surprising as low pressure systems and northeasterly storms are observed more frequently along the east coast of Greenland during positive NAO years as a result of the northward shift in the North Atlantic storm track. Previous studies of sediment cores obtained from the mid-region of the fjord showed that Helheim Glacier destabilization coincides with a negative NAO index. Therefore we conclude that inter-annual variability in storm-induced flushing of Sermilik Fjord and thus the water renewal rate towards the glacier margin is not the controlling factor for inter-annual variability in Helheim Glacier destabilization. Such knowledge may have implications on predictive model studies of ice-ocean interactions and glacier behavior. (C) 2014 Elsevier Ltd. All rights reserved.

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