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Reconstruction of sea ice concentration in northern Baffin Bay using deuterium excess in a coastal ice core from the northwestern Greenland Ice Sheet

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Title: Reconstruction of sea ice concentration in northern Baffin Bay using deuterium excess in a coastal ice core from the northwestern Greenland Ice Sheet
Authors: Kurosaki, Yutaka Browse this author
Matoba, Sumito Browse this author →KAKEN DB
Iizuka, Yoshinori Browse this author →KAKEN DB
Niwano, Masashi Browse this author
Tanikawa, Tomonori Browse this author
Ando, Takuto Browse this author
Hori, Akira Browse this author
Miyamoto, Atsushi Browse this author
Fujita, Shuji Browse this author
Aoki, Teruo Browse this author
Issue Date: 25-Aug-2020
Journal Title: Journal of Geophysical Research: Atmospheres
Volume: 125
Issue: 16
Start Page: e2019JD031668
Publisher DOI: 10.1029/2019JD031668
Abstract: Variations in the conditions of sea ice in the northern part of Baffin Bay and North Open Water polynya influence human activity in northwestern Greenland through oceanic circulation and heat balance between air and sea. To evaluate the impact of variations in sea ice conditions on the surrounding environment, it is important to understand the mechanism of sea ice variations over long periods. In this study, we estimated the age of the SIGMA‐A ice core collected northwestern Greenland Ice Sheet and researched the relationship between annual or seasonal deuterium excess (d‐excess) and seasonal sea ice concentration. We found that a temporal variation in the spring d‐excess in the ice core negatively correlated significantly with that of sea ice concentration in February–April in northern Baffin Bay from 1979–2005 (r = −0.61, p < 0.001). Using this relationship, we reconstructed the temporal variations in sea ice concentrations for 100 years from the ice core drilled in the northwestern Greenland Ice Sheet. The sea ice concentration in the early twentieth century was lower than that in the present. The decrease in sea ice concentration was consistent with analytical results for marine sediments obtained from Baffin Bay. We also suggested that the sea ice concentration was controlled by atmospheric conditions from the 1920s to 1940s based on examinations of correlations with the North Atlantic Oscillation index and air temperature in Ilulissat and by oceanographic conditions from 1945–1955, 1959–1969, and 1982–1992 based on the Atlantic Multidecadal Oscillation index and meridional heat transport to western Greenland.
Rights: Copyright 2020 American Geophysical Union.
Relation: [Dataset] SIGMA-A ice core water isotope and precipitation amount for Kurosaki et al., JGR-Atmos. 2020
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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