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New insights into Holocene atmospheric circulation dynamics in central Scandinavia inferred from oxygen-isotope records of lake-sediment cellulose

St Amour, Natalie A.; Hammarlund, Dan LU ; Edwards, Thomas W. D. and Wolfe, Brent B. (2010) In Boreas 39(4). p.770-782
Abstract
Cellulose-inferred lakewater oxygen-isotope records have been obtained from two hydrologically open basins (Lake Spaime and Lake Svartkalstjarn), located on a west east transect across central Sweden, to investigate changes in atmospheric circulation patterns during the Holocene. The Lake Spaime delta O-18 record is sensitive to changes in the seasonal distribution of precipitation in the Scandes Mountains of west-central Sweden, and thus generally portrays variations in delta O-18 of precipitation (delta O-18(P)) that are governed predominantly by the influence of air masses originating from the North Atlantic. In contrast, the Lake Svartkalstjarn delta O-18 record appears to reflect the varying influence of air masses delivering moisture... (More)
Cellulose-inferred lakewater oxygen-isotope records have been obtained from two hydrologically open basins (Lake Spaime and Lake Svartkalstjarn), located on a west east transect across central Sweden, to investigate changes in atmospheric circulation patterns during the Holocene. The Lake Spaime delta O-18 record is sensitive to changes in the seasonal distribution of precipitation in the Scandes Mountains of west-central Sweden, and thus generally portrays variations in delta O-18 of precipitation (delta O-18(P)) that are governed predominantly by the influence of air masses originating from the North Atlantic. In contrast, the Lake Svartkalstjarn delta O-18 record appears to reflect the varying influence of air masses delivering moisture from the North Atlantic and the Baltic Sea. A comparison of inferred changes in delta O-18(P) over the Holocene between the two sites reveals systematic patterns of variability over widely different time scales. These include: (1) a previously recognized long-term regional decline in delta O-18(P), possibly in response to the declining vigour of Northern Hemisphere atmospheric circulation related to decreasing summer solar insolation; (2) newly identified inverse centennial- to millennial-scale delta O-18(P) fluctuations at the two sites that may be linked to changes in modes of atmospheric circulation analogous to those described at interannual to multidecadal time scales by the North Atlantic Oscillation (NAO) index; and (3) a prolonged interval of apparent climatic stability in the mid-Holocene (c. 6300-4200 cal. yr BP) characterized by persistently negative NAO-like circulation. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Boreas
volume
39
issue
4
pages
770 - 782
publisher
Taylor & Francis
external identifiers
  • wos:000282223100010
  • scopus:78649554792
ISSN
1502-3885
DOI
10.1111/j.1502-3885.2010.00169.x
project
MERGE
BECC
language
English
LU publication?
yes
id
80aab490-8778-4f7a-88bf-03be1ec985e7 (old id 1815056)
date added to LUP
2011-03-02 11:41:31
date last changed
2018-05-29 09:26:13
@article{80aab490-8778-4f7a-88bf-03be1ec985e7,
  abstract     = {Cellulose-inferred lakewater oxygen-isotope records have been obtained from two hydrologically open basins (Lake Spaime and Lake Svartkalstjarn), located on a west east transect across central Sweden, to investigate changes in atmospheric circulation patterns during the Holocene. The Lake Spaime delta O-18 record is sensitive to changes in the seasonal distribution of precipitation in the Scandes Mountains of west-central Sweden, and thus generally portrays variations in delta O-18 of precipitation (delta O-18(P)) that are governed predominantly by the influence of air masses originating from the North Atlantic. In contrast, the Lake Svartkalstjarn delta O-18 record appears to reflect the varying influence of air masses delivering moisture from the North Atlantic and the Baltic Sea. A comparison of inferred changes in delta O-18(P) over the Holocene between the two sites reveals systematic patterns of variability over widely different time scales. These include: (1) a previously recognized long-term regional decline in delta O-18(P), possibly in response to the declining vigour of Northern Hemisphere atmospheric circulation related to decreasing summer solar insolation; (2) newly identified inverse centennial- to millennial-scale delta O-18(P) fluctuations at the two sites that may be linked to changes in modes of atmospheric circulation analogous to those described at interannual to multidecadal time scales by the North Atlantic Oscillation (NAO) index; and (3) a prolonged interval of apparent climatic stability in the mid-Holocene (c. 6300-4200 cal. yr BP) characterized by persistently negative NAO-like circulation.},
  author       = {St Amour, Natalie A. and Hammarlund, Dan and Edwards, Thomas W. D. and Wolfe, Brent B.},
  issn         = {1502-3885},
  language     = {eng},
  number       = {4},
  pages        = {770--782},
  publisher    = {Taylor & Francis},
  series       = {Boreas},
  title        = {New insights into Holocene atmospheric circulation dynamics in central Scandinavia inferred from oxygen-isotope records of lake-sediment cellulose},
  url          = {http://dx.doi.org/10.1111/j.1502-3885.2010.00169.x},
  volume       = {39},
  year         = {2010},
}