Variations in mineralogy of dust in an ice core obtained from northwestern Greenland over the past 100 years
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 past variations in the sources and transportation processes of mineral dust in northwestern Greenland, we analysed the morphology and mineral...
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ftdoajarticles:oai:doaj.org/article:0e4933065c8a44a58d92c847c55d6180 2023-05-15T16:25:08+02:00 Variations in mineralogy of dust in an ice core obtained from northwestern Greenland over the past 100 years N. Nagatsuka K. Goto-Azuma A. Tsushima K. Fujita S. Matoba Y. Onuma R. Dallmayr M. Kadota M. Hirabayashi J. Ogata Y. Ogawa-Tsukagawa K. Kitamura M. Minowa Y. Komuro H. Motoyama T. Aoki 2021-06-01T00:00:00Z https://doi.org/10.5194/cp-17-1341-2021 https://doaj.org/article/0e4933065c8a44a58d92c847c55d6180 EN eng Copernicus Publications https://cp.copernicus.org/articles/17/1341/2021/cp-17-1341-2021.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-17-1341-2021 1814-9324 1814-9332 https://doaj.org/article/0e4933065c8a44a58d92c847c55d6180 Climate of the Past, Vol 17, Pp 1341-1362 (2021) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2021 ftdoajarticles https://doi.org/10.5194/cp-17-1341-2021 2022-12-31T05:33:02Z 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 past variations in the sources and transportation processes of mineral dust in northwestern Greenland, we analysed the morphology and mineralogical composition of dust in the SIGMA-D ice core from 1915 to 2013 using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The results revealed that the ice core dust consisted mainly of silicate minerals and that the composition varied substantially on multi-decadal and inter-decadal scales, suggesting that the ice core minerals originated from different geological sources in different periods during the past 100 years. The multi-decadal variation trend differed among mineral types. Kaolinite, which generally formed in warm and humid climatic zones, was abundant in colder periods (1950–2004), whereas mica, chlorite, feldspars, mafic minerals, and quartz, which formed in arid, high-latitude, and local areas, were abundant in warmer periods (1915–1949 and 2005–2013). Comparison to Greenland surface temperature records indicates that multi-decadal variation in the relative abundance of these minerals was likely affected by local temperature changes in Greenland. Trajectory analysis shows that the minerals were transported mainly from the western coast of Greenland in the two warming periods, which was likely due to an increase in dust sourced from local ice-free areas as a result of shorter snow/ice cover duration in the Greenland coastal region during the melt season caused by recent warming. Meanwhile, ancient deposits in northern Canada, which were formed in past warmer climates, seem to be the best candidate during the colder period (1950–2004). Our results suggest that SEM–EDS analysis can detect variations in ice core dust sources during recent periods of low dust concentration. Article in Journal/Newspaper Greenland Greenland ice core ice core Directory of Open Access Journals: DOAJ Articles Canada Greenland Climate of the Past 17 3 1341 1362 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 N. Nagatsuka K. Goto-Azuma A. Tsushima K. Fujita S. Matoba Y. Onuma R. Dallmayr M. Kadota M. Hirabayashi J. Ogata Y. Ogawa-Tsukagawa K. Kitamura M. Minowa Y. Komuro H. Motoyama T. Aoki Variations in mineralogy of dust in an ice core obtained from northwestern Greenland over the past 100 years |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
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 past variations in the sources and transportation processes of mineral dust in northwestern Greenland, we analysed the morphology and mineralogical composition of dust in the SIGMA-D ice core from 1915 to 2013 using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The results revealed that the ice core dust consisted mainly of silicate minerals and that the composition varied substantially on multi-decadal and inter-decadal scales, suggesting that the ice core minerals originated from different geological sources in different periods during the past 100 years. The multi-decadal variation trend differed among mineral types. Kaolinite, which generally formed in warm and humid climatic zones, was abundant in colder periods (1950–2004), whereas mica, chlorite, feldspars, mafic minerals, and quartz, which formed in arid, high-latitude, and local areas, were abundant in warmer periods (1915–1949 and 2005–2013). Comparison to Greenland surface temperature records indicates that multi-decadal variation in the relative abundance of these minerals was likely affected by local temperature changes in Greenland. Trajectory analysis shows that the minerals were transported mainly from the western coast of Greenland in the two warming periods, which was likely due to an increase in dust sourced from local ice-free areas as a result of shorter snow/ice cover duration in the Greenland coastal region during the melt season caused by recent warming. Meanwhile, ancient deposits in northern Canada, which were formed in past warmer climates, seem to be the best candidate during the colder period (1950–2004). Our results suggest that SEM–EDS analysis can detect variations in ice core dust sources during recent periods of low dust concentration. |
format |
Article in Journal/Newspaper |
author |
N. Nagatsuka K. Goto-Azuma A. Tsushima K. Fujita S. Matoba Y. Onuma R. Dallmayr M. Kadota M. Hirabayashi J. Ogata Y. Ogawa-Tsukagawa K. Kitamura M. Minowa Y. Komuro H. Motoyama T. Aoki |
author_facet |
N. Nagatsuka K. Goto-Azuma A. Tsushima K. Fujita S. Matoba Y. Onuma R. Dallmayr M. Kadota M. Hirabayashi J. Ogata Y. Ogawa-Tsukagawa K. Kitamura M. Minowa Y. Komuro H. Motoyama T. Aoki |
author_sort |
N. Nagatsuka |
title |
Variations in mineralogy of dust in an ice core obtained from northwestern Greenland over the past 100 years |
title_short |
Variations in mineralogy of dust in an ice core obtained from northwestern Greenland over the past 100 years |
title_full |
Variations in mineralogy of dust in an ice core obtained from northwestern Greenland over the past 100 years |
title_fullStr |
Variations in mineralogy of dust in an ice core obtained from northwestern Greenland over the past 100 years |
title_full_unstemmed |
Variations in mineralogy of dust in an ice core obtained from northwestern Greenland over the past 100 years |
title_sort |
variations in mineralogy of dust in an ice core obtained from northwestern greenland over the past 100 years |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-1341-2021 https://doaj.org/article/0e4933065c8a44a58d92c847c55d6180 |
geographic |
Canada Greenland |
geographic_facet |
Canada Greenland |
genre |
Greenland Greenland ice core ice core |
genre_facet |
Greenland Greenland ice core ice core |
op_source |
Climate of the Past, Vol 17, Pp 1341-1362 (2021) |
op_relation |
https://cp.copernicus.org/articles/17/1341/2021/cp-17-1341-2021.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-17-1341-2021 1814-9324 1814-9332 https://doaj.org/article/0e4933065c8a44a58d92c847c55d6180 |
op_doi |
https://doi.org/10.5194/cp-17-1341-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
3 |
container_start_page |
1341 |
op_container_end_page |
1362 |
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1766013828184670208 |