The colour of climate : A study of raised bogs in south-central Sweden

This thesis focuses on responses in raised bogs to changes in the effective humidity during the Holocene. Raised bogs are terrestrial deposits that can provide contiguous records of past climate changes. Information on and knowledge about past changes in climate is crucial for our understanding of n...

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Main Author: Borgmark, Anders
Format: Doctoral or Postdoctoral Thesis
Language:English
Published: Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK) 2005
Subjects:
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-619
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spelling ftstockholmuniv:oai:DiVA.org:su-619 2023-05-15T17:35:48+02:00 The colour of climate : A study of raised bogs in south-central Sweden Borgmark, Anders 2005 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-619 eng eng Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK) Stockholm : Institutionen för naturgeografi och kvartärgeologi Avhandling i kvartärgeologi, 1651-3940 4 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-619 urn:isbn:91-7155-101-8 info:eu-repo/semantics/openAccess Holocene south-central Sweden peat humification bog hydrology climate variation spectral analysis Quaternary geology Kvartärgeologi Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2005 ftstockholmuniv 2023-02-23T21:38:32Z This thesis focuses on responses in raised bogs to changes in the effective humidity during the Holocene. Raised bogs are terrestrial deposits that can provide contiguous records of past climate changes. Information on and knowledge about past changes in climate is crucial for our understanding of natural climate variability. Analyses on different spatial and temporal scales have been conducted on a number of raised bogs in south-central Sweden in order to gain more knowledge about Holocene climate variability. Peatlands are useful as palaeoenvironmental archives because they develop over the course of millennia and provide a multi-faceted contiguous outlook on the past. Peat humification, a proxy for bog surface wetness, has been used to reconstruct palaeoclimate. In addition measurements of carbon and nitrogen on sub-recent peat from two bogs have been performed. The chronologies have been constrained by AMS radiocarbon dates and tephrochronology and by SCPs for the sub-recent peat. A comparison between a peat humification record from Värmland, south-central Sweden, and a dendrochronological record from Jämtland, north-central Sweden, indicates several synchronous changes between drier and wetter climate. This implies that changes in hydrology operate on a regional scale. In a high resolution study of two bogs in Uppland, south-central Sweden, C, N and peat humification have been compared to bog water tables inferred from testate amoebae and with meteorological data covering the last 150 years. The results indicate that peat can be subjected to secondary decomposition, resulting in an apparent lead in peat humification and C/N compared to biological proxies and meteorological data. Several periods of wetter conditions are indicated from the analysis of five peat sequences from three bogs in Värmland. Wetter conditions around especially c. 4500, 3500, 2800 and 1700-1000 cal yr BP can be correlated to several other climate records across the North Atlantic region and Scandinavia, indicating wetter and/or cooler ... Doctoral or Postdoctoral Thesis North Atlantic Stockholm University: Publications (DiVA)
institution Open Polar
collection Stockholm University: Publications (DiVA)
op_collection_id ftstockholmuniv
language English
topic Holocene
south-central Sweden
peat humification
bog hydrology
climate variation
spectral analysis
Quaternary geology
Kvartärgeologi
spellingShingle Holocene
south-central Sweden
peat humification
bog hydrology
climate variation
spectral analysis
Quaternary geology
Kvartärgeologi
Borgmark, Anders
The colour of climate : A study of raised bogs in south-central Sweden
topic_facet Holocene
south-central Sweden
peat humification
bog hydrology
climate variation
spectral analysis
Quaternary geology
Kvartärgeologi
description This thesis focuses on responses in raised bogs to changes in the effective humidity during the Holocene. Raised bogs are terrestrial deposits that can provide contiguous records of past climate changes. Information on and knowledge about past changes in climate is crucial for our understanding of natural climate variability. Analyses on different spatial and temporal scales have been conducted on a number of raised bogs in south-central Sweden in order to gain more knowledge about Holocene climate variability. Peatlands are useful as palaeoenvironmental archives because they develop over the course of millennia and provide a multi-faceted contiguous outlook on the past. Peat humification, a proxy for bog surface wetness, has been used to reconstruct palaeoclimate. In addition measurements of carbon and nitrogen on sub-recent peat from two bogs have been performed. The chronologies have been constrained by AMS radiocarbon dates and tephrochronology and by SCPs for the sub-recent peat. A comparison between a peat humification record from Värmland, south-central Sweden, and a dendrochronological record from Jämtland, north-central Sweden, indicates several synchronous changes between drier and wetter climate. This implies that changes in hydrology operate on a regional scale. In a high resolution study of two bogs in Uppland, south-central Sweden, C, N and peat humification have been compared to bog water tables inferred from testate amoebae and with meteorological data covering the last 150 years. The results indicate that peat can be subjected to secondary decomposition, resulting in an apparent lead in peat humification and C/N compared to biological proxies and meteorological data. Several periods of wetter conditions are indicated from the analysis of five peat sequences from three bogs in Värmland. Wetter conditions around especially c. 4500, 3500, 2800 and 1700-1000 cal yr BP can be correlated to several other climate records across the North Atlantic region and Scandinavia, indicating wetter and/or cooler ...
format Doctoral or Postdoctoral Thesis
author Borgmark, Anders
author_facet Borgmark, Anders
author_sort Borgmark, Anders
title The colour of climate : A study of raised bogs in south-central Sweden
title_short The colour of climate : A study of raised bogs in south-central Sweden
title_full The colour of climate : A study of raised bogs in south-central Sweden
title_fullStr The colour of climate : A study of raised bogs in south-central Sweden
title_full_unstemmed The colour of climate : A study of raised bogs in south-central Sweden
title_sort colour of climate : a study of raised bogs in south-central sweden
publisher Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK)
publishDate 2005
url http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-619
genre North Atlantic
genre_facet North Atlantic
op_relation Avhandling i kvartärgeologi, 1651-3940
4
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-619
urn:isbn:91-7155-101-8
op_rights info:eu-repo/semantics/openAccess
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