Ruth, Urs; Wagenbach, Dietmar; Bigler, Matthias; Steffensen, Jørgen P.; Röthlisberger, Regine; Miller, Heinz (2002). High-resolution microparticle profiles at NorthGRIP, Greenland: Case studies of the calcium-dust relationship. Annals of glaciology, 35, pp. 237-242. International Glaciological Society 10.3189/172756402781817347
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A novel flow-through microparticle detector was deployed concurrently with continuous flow analyses of major ions during the North Greenland Icecore Project 2000 field season. the easy-handling detector performs continuous counting and sizing. In this deployment the lower size-detection limit was conservatively set to 1.0 μm equivalent spherical particle diameter, and a depth resolution of ≤1cm was achieved for microparticle concentrations. the dust concentration usually followed the Ca2+ variability. Here results are presented from an inspection of the Ca/dust mass ratio in 23 selected intervals, 1.65 m long each, covering different climatic periods including Holocene and Last Glacial Maximum (LGM). A (Ca2+)/(insoluble dust) mass ratio of 0.29 was found for the Holocene and 0.11 for LGM. Changes to the Ca/dust ratio occur on an annual to multi-annual time-scale exhibiting the same pattern, i.e. a lower Ca/dust ratio for higher crustal concentrations. Moreover, the Ca2+/dust ratio may increase significantly during episodic events such as volcanic horizons due to enhanced dissolution of CaCO3. This calls into question the notion of deploying Ca2+ as a quantitative mineral dust reference species and shows the importance of variable source properties or fractionating processes during transport and deposition.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Physics Institute > Climate and Environmental Physics |
Subjects: |
500 Science > 530 Physics |
ISSN: |
0260-3055 |
Publisher: |
International Glaciological Society |
Language: |
English |
Submitter: |
BORIS Import 2 |
Date Deposited: |
21 Sep 2021 15:35 |
Last Modified: |
21 Sep 2021 15:41 |
Publisher DOI: |
10.3189/172756402781817347 |
BORIS DOI: |
10.48350/158775 |
URI: |
https://boris.unibe.ch/id/eprint/158775 |
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