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Climate of the Past An interactive open-access journal of the European Geosciences Union
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We present a first high-temporal-resolution record of mineral composition in a Greenland ice core over the past 100 years using SEM-EDS analysis. Our main finding is the ice core dust composition varied on multi-decadal scales that can be attributed to the local temperature changes. We also reveal that the western coast of Greenland is main source of the ice core dust in warming periods (1915 to 1949 and 2005 to 2013), which is likely due to an increase of dust sourced from local ice-free areas.
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https://doi.org/10.5194/cp-2020-146
https://doi.org/10.5194/cp-2020-146

  03 Dec 2020

03 Dec 2020

Review status: this preprint is currently under review for the journal CP.

Variations in mineralogy of dust in an ice core obtained from northwestern Greenland over the past 100 years

Naoko Nagatsuka1, Kumiko Goto-Azuma1,2, Akane Tsushima3, Koji Fujita4, Sumito Matoba5, Yukihiko Onuma6, Moe Kadota5,7, Masahiro Minowa4, Yuki Komuro1, Hideaki Motoyama1,2, and Teruo Aoki1 Naoko Nagatsuka et al.
  • 1National Institute of Polar Research, Tokyo 190-8518, Japan
  • 2Department of Polar Science, The Graduate University for Advanced Studies, SOKENDAI, Tokyo 190-8518, Japan
  • 3Meteorological Research Institute, Tsukuba 305-0052, Japan
  • 4Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan
  • 5Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan
  • 6Institute of Industrial Science, University of Tokyo, Kashiwa 277-8574, Japan
  • 7Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan

Abstract. Our study is the first to demonstrate a high-temporal-resolution record of mineral composition in a Greenland ice core over the past 100 years. To reconstruct the past variations in the sources and transportation processes of mineral dust in northwestern Greenland, we analyzed the morphology and mineralogical composition of dust in an ice core from 1915 to 2013 using Scanning Electron Microscopy (SEM) and Energy-Dispersive X-ray Spectroscopy (EDS). Analysis of the SEM-EDS reveals that the ice core dust mainly consisted of silicate minerals and the composition varied substantially on multi-decadal and inter-decadal scales, suggesting that the geological origin of the ice core minerals changed periodically during the past 100 years. The multi-decadal variation trend differed among mineral types: kaolinite generally formed in low- or middle-latitude areas were abundant in the colder periods (1950 to 2000), whereas mica, chlorite, feldspars, mafic minerals, and quartzes formed in arid, high-latitude, and local areas were abundant in the warmer periods (1915 to 1949 and 2005 to 2013). This indicates that the multi-decadal variation of the relative abundance of the minerals can be attributed to the local temperature changes in Greenland. The trajectory analysis shows that the minerals were mainly transported from the western coast of Greenland in the two warming periods, which was likely due to an increase of dust sourced from local ice-free areas. On the other hand, the abundant kaolinite was likely derived from old sediments at higher latitudes in North America, rather than from low and middle latitudes.

Naoko Nagatsuka et al.

 
Status: open (until 28 Jan 2021)
Status: open (until 28 Jan 2021)
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Naoko Nagatsuka et al.

Data sets

CMIP6.LS3MIP.MIROC.MIROC6.land-hist Yukihiko Onuma and Kim Hyungjun https://doi.org/10.22033/ESGF/CMIP6.5622

CMIP6.LS3MIP.MIROC.MIROC6.land-hist Yukihiko Onuma and Kim Hyungjun https://doi.org/10.22033/ESGF/CMIP6.5622

CMIP6.LS3MIP.MIROC.MIROC6.land-hist-princeton Yukihiko Onuma and Kim Hyungjun https://doi.org/10.22033/ESGF/CMIP6.5628

CMIP6.LS3MIP.MIROC.MIROC6.land-hist-wfdei Yukihiko Onuma and Kim Hyungjun https://doi.org/10.22033/ESGF/CMIP6.5629

Naoko Nagatsuka et al.

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Short summary
We present a first high-temporal-resolution record of mineral composition in a Greenland ice core over the past 100 years using SEM-EDS analysis. Our main finding is the ice core dust composition varied on multi-decadal scales that can be attributed to the local temperature changes. We also reveal that the western coast of Greenland is main source of the ice core dust in warming periods (1915 to 1949 and 2005 to 2013), which is likely due to an increase of dust sourced from local ice-free areas.
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