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Glacier response to the Little Ice Age during the Neoglacial cooling in Greenland

Kjær, Kurt H.; Bjørk, Anders A.; Kjeldsen, Kristian K.; Hansen, Eric S.; Andresen, Camilla S.; Siggaard-Andersen, Marie-Louise; Khan, Shfaqat A.; Søndergaard, Anne Sofie; Colgan, William; Schomacker, Anders; Woodroffe, Sarah; Funder, Svend; Rouillard, Alexandra; Jensen, Jens Fog; Larsen, Nicolaj K.

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Authors

Kurt H. Kjær

Anders A. Bjørk

Kristian K. Kjeldsen

Eric S. Hansen

Camilla S. Andresen

Marie-Louise Siggaard-Andersen

Shfaqat A. Khan

Anne Sofie Søndergaard

William Colgan

Anders Schomacker

Svend Funder

Alexandra Rouillard

Jens Fog Jensen

Nicolaj K. Larsen



Abstract

In the Northern Hemisphere, an insolation driven Early to Middle Holocene Thermal Maximum was followed by a Neoglacial cooling that culminated during the Little Ice Age (LIA). Here, we review the glacier response to this Neoglacial cooling in Greenland. Changes in the ice margins of outlet glaciers from the Greenland Ice Sheet as well as local glaciers and ice caps are synthesized Greenland-wide. In addition, we compare temperature reconstructions from ice cores, elevation changes of the ice sheet across Greenland and oceanographic reconstructions from marine sediment cores over the past 5,000 years. The data are derived from a comprehensive review of the literature supplemented with unpublished reports. Our review provides a synthesis of the sensitivity of the Greenland ice margins and their variability, which is critical to understanding how Neoglacial glacier activity was interrupted by the current anthropogenic warming. We have reconstructed three distinct periods of glacier expansion from our compilation: two older Neoglacial advances at 2,500 – 1,700 yrs. BP (Before Present = 1950 CE, Common Era) and 1,250 – 950 yrs. BP; followed by a general advance during the younger Neoglacial between 700-50 yrs. BP, which represents the LIA. There is still insufficient data to outline the detailed spatio-temporal relationships between these periods of glacier expansion. Many glaciers advanced early in the Neoglacial and persisted in close proximity to their present-day position until the end of the LIA. Thus, the LIA response to Northern Hemisphere cooling must be seen within the wider context of the entire Neoglacial period of the past 5,000 years. Ice expansion appears to be closely linked to changes in ice sheet elevation, accumulation, and temperature as well as surface-water cooling in the surrounding oceans. At least for the two youngest Neoglacial advances, volcanic forcing triggering a sea-ice /ocean feedback, could explain their initiation. There are probably several LIA glacier fluctuations since the first culmination close to 1250 CE (Common Era) and available data suggests ice culminations in the 1400s, early to mid-1700s and early to mid-1800s CE. The last LIA maxima lasted until the present deglaciation commenced around 50 yrs. BP (1900 CE). The constraints provided here on the timing and magnitude of LIA glacier fluctuations delivers a more realistic background validation for modelling future ice sheet stability.

Citation

Kjær, K. H., Bjørk, A. A., Kjeldsen, K. K., Hansen, E. S., Andresen, C. S., Siggaard-Andersen, M., …Larsen, N. K. (2022). Glacier response to the Little Ice Age during the Neoglacial cooling in Greenland. Earth-Science Reviews, 227, Article 103984. https://doi.org/10.1016/j.earscirev.2022.103984

Journal Article Type Article
Acceptance Date Feb 26, 2022
Online Publication Date Mar 15, 2022
Publication Date 2022-04
Deposit Date Mar 31, 2022
Publicly Available Date Apr 19, 2022
Journal Earth-Science Reviews
Print ISSN 0012-8252
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 227
Article Number 103984
DOI https://doi.org/10.1016/j.earscirev.2022.103984

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