Influence of environmental conditions near Baffin Bay on deuterium excess and chemical substances in falling snow in northwestern Greenland

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  • KUROSAKI Yutaka
    Graduate School of Environmental Science, Hokkaido University Institute of Low Temperature Science, Hokkaido University
  • MATOBA Sumito
    Institute of Low Temperature Science, Hokkaido University
  • IIZUKA Yoshinori
    Institute of Low Temperature Science, Hokkaido University
  • NIWANO Masashi
    Meteorological Research Institute, Japan Meteorological Agency
  • TANIKAWA Tomonori
    Meteorological Research Institute, Japan Meteorological Agency
  • AOKI Teruo
    Graduate School of Natural Science and Technology, Okayama University

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  • バフィン湾周辺の環境がグリーンランド北西部の降雪中のd-excessと化学成分に与える影響
  • バフィンワン シュウヘン ノ カンキョウ ガ グリーンランド ホクセイブ ノ コウセツ チュウ ノ d-excess ト カガク セイブン ニ アタエル エイキョウ

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Abstract

To understand the mechanisms of changes in water-stable isotopes and chemical substances in falling snow in northwestern Greenland, we sampled surface snow at the SIGMA-A site of the northwestern Greenland Ice Sheet from 25 May to 6 June 2017, and analyzed water-stable isotopes and chemical substances in the samples. During the observation period, deuterium excess (d-excess) peaked on 30 May and 5 June, corresponding to low concentrations of chemical substances from terrestrial mineral dust and anthropogenic activity and a low Cl−/Na+ ratio, which was close to the ratio in seawater. This suggests that sea salt and air were transported from seawater close to SIGMA-A. Analyses of the backward trajectory and meteorological conditions showed that the air mass leading to the high d-excess snowfall was transported toward SIGMA-A above an open water area in a cold, dry air mass that stayed over Baffin Bay for a relatively long period of time because of cyclonic flow into a depression over 10m above sea level over the bay.

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