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Shifts in precipitation during the last millennium in northern Scandinavia from lacustrine isotope records
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
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2013 (English)In: Quaternary Science Reviews, ISSN 0277-3791, Vol. 66, 22-34 p.Article in journal (Refereed) Published
Abstract [en]

Here we present delta P-18(diatom) data from two high-latitude lakes; one has short residence time and a water isotopic composition (delta O-18(lake)) that fluctuate due to seasonal variations in precipitation and temperature, and the other has delta O-18(lake) that is influenced by longer lake water residence times and evaporation. The delta O-18(diatom) records reveal common responses to precipitation forcing over the past millennium. Relatively wet summers are inferred from delta O-18(diatom) between 1000 and 1080 AD, 1300 and 1440 AD, and during the early 19th century, coincided with periods of high cloud cover inferred from tree-ring carbon isotopes, and other data for high Arctic Oscillation index. While relatively dry summers with increasing influence of winter snow are indicated between 1600 and 1750 AD. The co-response between carbon isotopes in trees and oxygen isotopes in diatoms strengthens the relationship between cloud cover and precipitation and the hypothesis that these changes were the result of significant regional shifts in atmospheric circulation.

Place, publisher, year, edition, pages
2013. Vol. 66, 22-34 p.
Keyword [en]
Last millennium, Lakes, Isotope, Diatoms, Scandinavian climate
National Category
Physical Geography Geology
URN: urn:nbn:se:su:diva-89989DOI: 10.1016/j.quascirev.2012.10.030ISI: 000317448500003OAI: diva2:622317
EU, European Research Council, 017008


Available from: 2013-05-21 Created: 2013-05-20 Last updated: 2014-09-05Bibliographically approved
In thesis
1. The sensitivity of Swedish alpine lakes to hydro-climatic changes during the Late Holocene
Open this publication in new window or tab >>The sensitivity of Swedish alpine lakes to hydro-climatic changes during the Late Holocene
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The thesis objective is to use lake sediments to investigate the relationships between chironomids, as proxy for temperature, and δ18O and minerogenic in-wash, as precipitation proxies, in northern Sweden during the Late Holocene. Three lakes along a N–S transect in the Scandes were studied using biological, geochemical and physical sediment properties, together with numerical methods. Emphasis was put on changes in hydrological and erosional regimes and the configurations of lake catchments in an attempt to avoid misinterpretation of the climate signals. Mean July air temperatures were inferred from the chironomid composition in sediment records covering the last 5000 yrs in Vindelfjällen Mountains in Mid Lapland and the last 1000 yrs in Jämtland. The temperature reconstructions underwent significance tests, suggesting reliable results for the Vindelfjällen reconstruction but not the Jämtland reconstruction. Data from XRF core scanning and grain size variations, interpreted together with catchment geomorphology, suggested periods with increased fluvial erosion. A major flood event occurred at the Vindelfjällen site c. 2800 cal. yr BP. Furthermore, this record indicates stream flow and wetland surface erosion during the last 1200 yrs. Seasonal variations in the amount of precipitation, reflecting changes in atmospheric circulation during the last 1000 yrs, were reconstructed based on δ18O in diatoms from one lake in Jämtland and one in northern Lapland. Relatively higher summer precipitation was inferred between AD 1000 and 1080, AD 1300 and 1440, and during the early 19th century as a result of a positive Arctic Oscillation mode. Changes in chironomid composition in the Jämtland lake were concurrent with shifts in δ18Odiatom suggesting indirect responses to circulation changes. Changes in precipitation are suggested to be an important factor that may cause the spatially variable results among chironomid-based July air temperature reconstructions in Scandinavia.

Place, publisher, year, edition, pages
Stockholm: Department of Physical Geography and Quaternary Geology, Stockholm University, 2014. 34 p.
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 44
alpine lake sediments, temperature reconstruction, precipitation, catchment erosion, chironomids, oxygen isotopes, XRF core scanning, geomorphology, grain size analysis
National Category
Research subject
Quaternary Geology
urn:nbn:se:su:diva-107073 (URN)978-91-7447-978-2 (ISBN)
Public defence
2014-10-09, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 13:00 (English)

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.

Available from: 2014-09-18 Created: 2014-09-03 Last updated: 2014-10-30Bibliographically approved

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Rosqvist, Gunhild C.Berntsson, AnnikaWastegård, Stefan
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