Changes in Greenland’s peripheral glaciers linked to the North Atlantic Oscillation

Glaciers and ice caps peripheral to the main Greenland Ice Sheet contribute markedly to sea-level rise1–3. Their changes and variability, however, have been difficult to quantify on multi-decadal timescales due to an absence of long-term data4. Here, using historical aerial surveys, expedition photo...

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Bibliographic Details
Published in:Nature climate change 2018-01, Vol.8 (1), p.48-52
Main Authors: Bjørk, A. A., Aagaard, S., Lütt, A., Khan, S. A., Box, J. E., Kjeldsen, K. K., Larsen, N. K., Korsgaard, N. J., Cappelen, J., Colgan, W. T., Machguth, H., Andresen, C. S., Peings, Y., Kjær, K. H.
Format: Article
Language:English
Subjects:
Aerial photography
Aerial surveying
Aerial surveys
Atmospheric forcing
Expeditions
Glaciation
Glacier fluctuations
Glacier mapping
Glaciers
Greenland ice sheet
Ice
Ice caps
Ice sheets
Ice volume
Imagery
North Atlantic Oscillation
Ocean-atmosphere system
Precipitation
Remote sensing
Satellite imagery
Satellites
Sea level
Sea level changes
Sea level rise
Spaceborne remote sensing
Surveys
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Summary:Glaciers and ice caps peripheral to the main Greenland Ice Sheet contribute markedly to sea-level rise1–3. Their changes and variability, however, have been difficult to quantify on multi-decadal timescales due to an absence of long-term data4. Here, using historical aerial surveys, expedition photographs, spy satellite imagery and new remote-sensing products, we map glacier length fluctuations of approximately 350 peripheral glaciers and ice caps in East and West Greenland since 1890. Peripheral glaciers are found to have recently undergone a widespread and significant retreat at rates of 12.2 m per year and 16.6 m per year in East and West Greenland, respectively; these changes are exceeded in severity only by the early twentieth century post-Little-Ice-Age retreat. Regional changes in ice volume, as reflected by glacier length, are further shown to be related to changes in precipitation associated with the North Atlantic Oscillation (NAO), with a distinct east–west asymmetry; positive phases of the NAO increase accumulation, and thereby glacier growth, in the eastern periphery, whereas opposite effects are observed in the western periphery. Thus, with projected trends towards positive NAO in the future5,6, eastern peripheral glaciers may remain relatively stable, while western peripheral glaciers will continue to diminish.
ISSN:1758-678X
1758-6798
DOI:10.1038/s41558-017-0029-1