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Statistical extraction of volcanic sulphate from nonpolar ice cores
Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing 100875, Peoples R China.;Univ Lapland, Arctic Ctr, FI-96101 Rovaniemi, Finland.;Uppsala Univ, Dept Earth Sci, SE-75236 Uppsala, Sweden..
Univ Lapland, Arctic Ctr, FI-96101 Rovaniemi, Finland..
Chinese Acad Sci, Key Lab Tibetan Environm Changes & Land Surface P, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China.;Chinese Acad Sci, State Key Lab Cryospher Sci, Lanzhou, Peoples R China..
Univ Tromso, Dept Math & Stat, N-9018 Tromso, Norway..
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2012 (English)In: Journal of Geophysical Research - Atmospheres, ISSN 2169-897X, E-ISSN 2169-8996, Vol. 117, D03306Article in journal (Refereed) Published
Abstract [en]

Ice cores from outside the Greenland and Antarctic ice sheets are difficult to date because of seasonal melting and multiple sources (terrestrial, marine, biogenic and anthropogenic) of sulfates deposited onto the ice. Here we present a method of volcanic sulfate extraction that relies on fitting sulfate profiles to other ion species measured along the cores in moving windows in log space. We verify the method with a well dated section of the Belukha ice core from central Eurasia. There are excellent matches to volcanoes in the preindustrial, and clear extraction of volcanic peaks in the post-1940 period when a simple method based on calcium as a proxy for terrestrial sulfate fails due to anthropogenic sulfate deposition. We then attempt to use the same statistical scheme to locate volcanic sulfate horizons within three ice cores from Svalbard and a core from Mount Everest. Volcanic sulfate is < 5% of the sulfate budget in every core, and differences in eruption signals extracted reflect the large differences in environment between western, northern and central regions of Svalbard. The Lomonosovfonna and Vestfonna cores span about the last 1000 years, with good extraction of volcanic signals, while Holtedahlfonna which extends to about AD1700 appears to lack a clear record. The Mount Everest core allows clean volcanic signal extraction and the core extends back to about AD700, slightly older than a previous flow model has suggested. The method may thus be used to extract historical volcanic records from a more diverse geographical range than hitherto.

Place, publisher, year, edition, pages
2012. Vol. 117, D03306
Research subject
SWEDARCTIC
Identifiers
URN: urn:nbn:se:polar:diva-2413DOI: 10.1029/2011JD016592ISI: 000300231400007OAI: oai:DiVA.org:polar-2413DiVA: diva2:883980
Available from: 2015-12-17 Created: 2015-10-07 Last updated: 2015-12-17

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