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Limnic responses to increased effective humidity during the 8200 cal. Yr BP cooling event in southern Sweden

Hammarlund, Dan LU ; Björck, Svante LU ; Buchardt, B and Thomsen, CT (2005) In Journal of Paleolimnology 34(4). p.471-480
Abstract
Highly resolved sediment stratigraphic and stable isotope records from a lake in south-central Sweden give evidence of relatively humid summers during the wide-spread cold event at c. 8200 cal. BP. A transient lake-level rise led to increased catchment erosion followed by enhanced phytoplankton production and disturbance of the Chara-dominated algal community. An associated increase in the deposition of organic material resulted in hypolimnetic oxygen deficit and methane formation as inferred from elevated sulphur content of the sediments and strong depletion in C-13 of bulk organic material. In combination with dry and cold winter conditions as revealed by other proxy records, these data suggest the development of a strongly seasonal... (More)
Highly resolved sediment stratigraphic and stable isotope records from a lake in south-central Sweden give evidence of relatively humid summers during the wide-spread cold event at c. 8200 cal. BP. A transient lake-level rise led to increased catchment erosion followed by enhanced phytoplankton production and disturbance of the Chara-dominated algal community. An associated increase in the deposition of organic material resulted in hypolimnetic oxygen deficit and methane formation as inferred from elevated sulphur content of the sediments and strong depletion in C-13 of bulk organic material. In combination with dry and cold winter conditions as revealed by other proxy records, these data suggest the development of a strongly seasonal climate in northwestern Europe in response to altered atmospheric circulation at this stage. Enhanced zonal circulation with frequent cyclonic activity and increased effective humidity probably characterized the summer climate of southern and central Scandinavia, consistent with conditions inferred for continental Europe. In contrast, the winter climate was dominated by blocking high-pressure circulation, giving rise to cold and dry conditions. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
oxygen isotopes, lake sediments, carbon isotopes, holocene, palaeoclimate, sulphur content
in
Journal of Paleolimnology
volume
34
issue
4
pages
471 - 480
publisher
Springer
external identifiers
  • wos:000231997100005
  • scopus:25444477309
ISSN
0921-2728
DOI
10.1007/s10933-005-5614-z
language
English
LU publication?
yes
id
5e41aed2-ee66-45be-bcfa-7ceb5d3f3ee4 (old id 223686)
date added to LUP
2007-08-16 13:47:54
date last changed
2017-03-26 04:16:39
@article{5e41aed2-ee66-45be-bcfa-7ceb5d3f3ee4,
  abstract     = {Highly resolved sediment stratigraphic and stable isotope records from a lake in south-central Sweden give evidence of relatively humid summers during the wide-spread cold event at c. 8200 cal. BP. A transient lake-level rise led to increased catchment erosion followed by enhanced phytoplankton production and disturbance of the Chara-dominated algal community. An associated increase in the deposition of organic material resulted in hypolimnetic oxygen deficit and methane formation as inferred from elevated sulphur content of the sediments and strong depletion in C-13 of bulk organic material. In combination with dry and cold winter conditions as revealed by other proxy records, these data suggest the development of a strongly seasonal climate in northwestern Europe in response to altered atmospheric circulation at this stage. Enhanced zonal circulation with frequent cyclonic activity and increased effective humidity probably characterized the summer climate of southern and central Scandinavia, consistent with conditions inferred for continental Europe. In contrast, the winter climate was dominated by blocking high-pressure circulation, giving rise to cold and dry conditions.},
  author       = {Hammarlund, Dan and Björck, Svante and Buchardt, B and Thomsen, CT},
  issn         = {0921-2728},
  keyword      = {oxygen isotopes,lake sediments,carbon isotopes,holocene,palaeoclimate,sulphur content},
  language     = {eng},
  number       = {4},
  pages        = {471--480},
  publisher    = {Springer},
  series       = {Journal of Paleolimnology},
  title        = {Limnic responses to increased effective humidity during the 8200 cal. Yr BP cooling event in southern Sweden},
  url          = {http://dx.doi.org/10.1007/s10933-005-5614-z},
  volume       = {34},
  year         = {2005},
}