Shallow ice core drilling and preliminary analysis at South-East Dome, Greenland

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  • グリーンランド南東ドームにおける浅層アイスコア掘削と初期物理解析
  • グリーンランド ナントウ ドーム ニ オケル センソウ アイスコア クッサク ト ショキ ブツリ カイセキ

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Abstract

In order to understand 1) temporal variations of anthropogenic aerosols from European regions under the Icelandic Low with high time resolution, and 2) the snow densification mechanism at a high accumulation dome in Greenland, we drilled a 90.45 m ice core in a high accumulation area of the southeastern Greenland Ice Sheet. The drilling site (SE-Dome; 67.18°N, 36.37°W, 3170 m a.s.l.) is located 185 km north of the town of Tasiilaq in southeastern Greenland. The ice temperature is -20.9℃ at 20 m depth, and the site has an average accumulation rate of 1.0 m w.e. yr-1 in water equivalent. The ice core exhibits distinct firn densification. The close-off density of 830 kg m-3 occurs at 83.4-86.8 m depth, which is about 20 m shallower than predicted from an empirical model. In the region where the density ρ＞750 kg m-3, the densification appears faster than according to the empirical model.

Journal

  • 低温科学

    低温科学 75 45-52, 2017-03-31

    低温科学第75巻編集委員会

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