High-resolution microparticle profiles at NorthGRIP, Greenland: Case studies of the calcium-dust relationship
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Date of Publication
2002
Publication Type
Article
Contributor
Ruth, Urs | |
Wagenbach, Dietmar | |
Bigler, Matthias | |
Steffensen, Jørgen P. | |
Röthlisberger, Regine | |
Miller, Heinz |
Subject(s)
Series
Annals of glaciology
ISSN or ISBN (if monograph)
0260-3055
Publisher
International Glaciological Society
Language
English
Publisher DOI
BORIS DOI
Description
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.
File(s)
File | File Type | Format | Size | License | Publisher/Copright statement | Content | |
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ruth02ag.pdf | Adobe PDF | 225.32 KB | publisher | published |