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High-resolution diatom delta O-18 records, from the last 150 years, reflecting changes in amount of winter precipitation in two sub-Arctic high-altitude lakes in the Swedish Scandes
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology (INK).
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology (INK).
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2010 (English)In: Journal of Quaternary Science, ISSN 0267-8179, E-ISSN 1099-1417, Vol. 25, no 6, 918-930 p.Article in journal (Refereed) Published
Abstract [en]

Waters from high-altitude alpine lakes are mainly recharged by meteoric water. Because of seasonal variations in precipitation and temperature and relatively short hydraulic residence times, most high-altitude lakes have lake water isotopic compositions (delta O-18(lake)) that fluctuate due to seasonality in water balance processes. Input from snowmelt, in particular, has a significant role in determining lake water delta O-18. Here we compare two high-resolution delta O-18(diatom) records from lake sediments in the Swedish Scandes with instrumental data from the last century obtained from nearby meteorological stations. The time period AD 1900-1990 is characterised by an increase in winter precipitation and high winter/summer precipitation ratios and this is recorded in delta O-18(diatom) as decreasing trends. Lowest delta O-18(diatom) values and highest amount of winter precipitation are found around AD 1990 when the winter North Atlantic Oscillation index was above +2. We conclude that for the last 150 a the main factor affecting the delta O-18(diatom) signal in these sub-Arctic high-altitude lakes with short residence times has been changes in amount of winter precipitation and that delta O-18(diatom) derived from high-altitude lakes in the Swedish Scandes can be used as a winter precipitation proxy.

Place, publisher, year, edition, pages
2010. Vol. 25, no 6, 918-930 p.
Keyword [en]
oxygen isotopes, high-altitude lakes, diatom silica, winter precipitation, North Atlantic Oscillation
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-51755DOI: 10.1002/jqs.1372ISI: 000281858800010OAI: oai:DiVA.org:su-51755DiVA: diva2:386017
Note
authorCount :7Available from: 2011-01-12 Created: 2011-01-12 Last updated: 2017-12-11Bibliographically approved

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Jonsson, Christina E.Rosqvist, Gunhild C.Tillman, Päivi Kaislahti
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