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A synthetic ice core approach to estimate ion relocation in anice field site experiencing periodical melt: a case study onLomonosovfonna, Svalbard
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Univ Lapland, Arctic Ctr, Rovaniemi 96101, Finland; Byrd Polar & Climate Res Ctr, 082A Scott Hall,1090 Carmack Rd, Columbus, OH 43210 USA.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
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2016 (English)In: The Cryosphere, ISSN 1994-0416, E-ISSN 1994-0424, Vol. 10, 961-976 p.Article in journal (Refereed) Published
Abstract [en]

Physical and chemical properties of four different ice cores (LF-97, LF-08, LF-09 and LF-11) drilled at Lomonosovfonna, Svalbard, were compared to investigate the effects of meltwater percolation on the chemical and physical stratigraphy of these records. A synthetic ice core approach was employed as reference record to estimate the ionic relocation and meltwater percolation length at this site during the period 2007-2010. Using this method, a partial ion elution sequence obtained for Lomonosovfonna was NO(3)(-)aEuro-> aEuro-SO42-, Mg2+, Cl-, K+, Na+ with nitrate being the most mobile within the snowpack. The relocation length of most of the ions was on the order of 1aEuro-m during this period. In addition, by using both a positive degree day (PDD) and a snow-energy model approaches to estimate the percentage of melt at Lomonosovfonna, we have calculated a melt percentage (MP) of the total annual accumulation within the range between 48 and 70aEuro-%, for the period between 2007 and 2010, which is above the MP range suggested by the ion relocation evidenced in the LF-syn core (i.e., MPaEuro-aEuro parts per thousand= aEuro-30aEuro-%). Using a firn-densification model to constrain the melt range, a MP of 30aEuro-% was found over the same period, which is consistent with the results of the synthetic ice core approach, and a 45aEuro-% of melt for the last 60 years. Considering the ionic relocation lengths and annual melt percentages, we estimate that the atmospheric ionic signal remains preserved in recently drilled Lomonosovfonna ice cores at an annual or bi-annual resolution when weather conditions were similar to those during the 2007-2010 period.

Place, publisher, year, edition, pages
2016. Vol. 10, 961-976 p.
National Category
Geosciences, Multidisciplinary
Research subject
Earth Science with specialization in Environmental Analysis
URN: urn:nbn:se:uu:diva-296180DOI: 10.5194/tc-10-961-2016ISI: 000379415500002OAI: diva2:936517
EU, European Research Council, 3.2.0801.12-0044
Available from: 2016-06-14 Created: 2016-06-14 Last updated: 2016-08-10Bibliographically approved

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Vega, Carmen P.Pohjola, Veijo A.van Pelt, Ward J. J.Pettersson, Rickard
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