uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Holocene temperatures in Bohuslan, southwest Sweden: A quantitative reconstruction from fossil pollen data
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2007 (English)In: Boreas, ISSN 0300-9483, E-ISSN 1502-3885, Vol. 36, no 4, 400-410 p.Article in journal (Refereed) Published
Abstract [en]

Inferred mean annual temperatures (Tann) from a radiocarbon-dated fossil pollen stratigraphy obtained from Lake Trehörningen, southwest Sweden, provide evidence of climate variability during the Holocene in the boreal-nemoral zone of Sweden. The record indicates low early Holocene temperatures, followed by a rising trend and maximum temperature values from about 7000 to 4000 cal. yr BP. During the later part of the Holocene until present day, a cooling trend is reflected in the temperature record. At about 8200 cal. yr BP, temperatures temporarily drop, and at 8000 cal. yr BP the rising temperature trend is recovered. Inferred mid-Holocene temperatures are about 2.5-3°C higher than at present, and also higher than other pollen-inferred mid-Holocene temperatures of 1.5-2.5°C further to the north and east in Scandinavia. The reconstructed long-term climate pattern in Trehörningen has an overall consistency with temperature reconstructions from Scandinavia, suggesting a regional climate link for the Holocene variability in Sweden. Holocene climate trends in Trehörningen also show a remarkably similar pattern with the classic work on postglacial climate change by Sernander (1893, Sernander 1909), Andersson (1909) and von Post (1924).

Place, publisher, year, edition, pages
2007. Vol. 36, no 4, 400-410 p.
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-12586DOI: 10.1080/03009480701317421ISI: 000250904200005OAI: oai:DiVA.org:uu-12586DiVA: diva2:40355
Available from: 2008-01-07 Created: 2008-01-07 Last updated: 2013-05-23Bibliographically approved
In thesis
1. Holocene Climate in Central and Southern Sweden: Quantitative Reconstructions from Fossil Data
Open this publication in new window or tab >>Holocene Climate in Central and Southern Sweden: Quantitative Reconstructions from Fossil Data
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In quantitative palaeoecology modern species-environmental relationships can be statistically modelled, and recent development has made the calibration models more statistically robust. These models are used to transform fossil assemblages to quantitative estimates of past environmental conditions. The aim of this thesis is to infer Holocene temperatures from fossil pollen data sampled from lakes in central and southern Sweden. This reconstruction is done by using a north-European pollen-climate calibration model, which was extended with 37 modern pollen samples from the southern deciduous vegetation zone in Sweden within this project. A statistical method is used for deriving the pollen-climate calibration model, weighted averaging partial least square (WA-PLS) method. The long term trends in pollen inferred temperatures from this study reflect low, but rapidly rising temperatures in the early-Holocene, a trend that was temporarily interrupted by a cool period about 8500 cal yr BP, but continued after 8000 cal yr BP. A Holocene thermal maximum (HTM) with temperatures roughly 2°C higher than at present was recorded about 7000 cal yr BP and by 4000 cal yr BP pollen inferred temperatures starts to decline. In order to create a more comprehensive picture of past climate patterns in the investigated area inferred temperatures from this study are compared with independent palaeorecords, a stable oxygen isotope record for moisture variability (paper I) and chironomids for summer temperature (paper II). Taken all together, these records reflect a coherent Holocene climate pattern which also is supported by several studies from Scandinavia and the north Atlantic region. Pollen inferred temperatures and the moisture record are indicating markedly dry, continental climate conditions in southern Sweden during the HTM possibly as a result of reorganisations in regional atmosphere circulations. The local observations in this study of regional climate events, such as the cold period at about 8200 cal yr BP and the dry period at about 7000 to 4000 cal yr BP are of particular interest because they suggest that vegetation in the study region has responded sensitively both to long-term climatic trends and more transient climate events.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 37 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 168
Quaternary geology, pollen analysis, climate reconstructions, transfer functions, vegetation dynamics, Sweden, Kvartärgeologi
urn:nbn:se:uu:diva-6805 (URN)91-554-6539-0 (ISBN)
Public defence
2006-05-08, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00
Available from: 2006-04-13 Created: 2006-04-13 Last updated: 2013-05-23Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text
By organisation
In the same journal
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 194 hits
ReferencesLink to record
Permanent link

Direct link