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High-resolution dia...
High-resolution diatom d18O records from two sub-Arctic high-altitude lakes in the Swedish Scandes
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- Jonsson, C. E. (författare)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Rosqvist, G. C. (författare)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Leng, M. J. (författare)
- NERC Isotope Geosciences Laboratory, BGS, UK
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- Bigler, C. (författare)
- Umeå universitet
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- Bergman, J. (författare)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Kaislahti Tillman, P. (författare)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Sloane, H. (författare)
- NERC Isotope Geosciences Laboratory, BGS, UK
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(creator_code:org_t)
- Engelska.
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Ingår i: Journal of Quaternary Science. - 0267-8179 .- 1099-1417.
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- 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 (δ18Olake) that fluctuate due to seasonality in water balance processes. Input from snowmelt, in particular, has a significant role in determining lake water d18O. Here we compare two high resolution δ18Odiatom 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 to AD 1990 is characterized by an increase in winter precipitation and high winter/summer precipitation ratios and this is recorded in δ18Odiatom as decreasing trends. Lowest δ18Odiatom 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 years the main factor affecting the δ18Odiatom signal in these sub-Arctic high altitude lakes with short residence times has been changes in amount of winter precipitation and that δ18Odiatom derived from high altitude lakes in the Swedish Scandes can be used as a winter precipitation proxy.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
Nyckelord
- oxygen isotopes
- high altitude lakes
- diatom silica
- winter precipitation
- North Atlantic Oscillation
- Physical geography
- Naturgeografi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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