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High-resolution dia...
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
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- Jonsson, Christina E. (author)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Rosqvist, Gunhild C. (author)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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Leng, Melanie J. (author)
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Bigler, Christian (author)
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- Bergman, Jonas (author)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Tillman, Päivi Kaislahti (author)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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Sloane, Hilary J. (author)
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(creator_code:org_t)
- 2010-02-16
- 2010
- English.
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In: Journal of Quaternary Science. - : Wiley. - 0267-8179 .- 1099-1417. ; 25:6, s. 918-930
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- 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.
Keyword
- oxygen isotopes
- high-altitude lakes
- diatom silica
- winter precipitation
- North Atlantic Oscillation
- NATURAL SCIENCES
- NATURVETENSKAP
Publication and Content Type
- ref (subject category)
- art (subject category)
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