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Response of Norwegian Sea temperature to solar forcing since 1000 AD

Sejrup, H.P.; Lehman, S.J.; Haflidason, H.; Noone, D.; Muscheler, Raimund LU ; Berstad, I.M. and Andrews, J.T. (2010) In Journal of Geophysical Research 115.
Abstract
Abstract: We report on a 1000 year long oxygen isotope record in sediments of the eastern Norwegian Sea which, we argue, represents the temperature and transport of warm Atlantic waters entering the Nordic Sea basin via the North Atlantic Drift and the large-scale Meridional Overturning Circulation. The single-sample resolution of the record is 2.5-10 years and age control is provided by Pb-210 and Cs-137 dating, identification of historic tephra, and a C-14 "wiggle-match" dating method in which the surface reservoir 14C age in the past is constrained rather than assumed, thereby eliminating a large source of chronological uncertainty. The oxygen isotope results indicate decade- to century-scale temperature variations of 1-2 degrees C in... (More)
Abstract: We report on a 1000 year long oxygen isotope record in sediments of the eastern Norwegian Sea which, we argue, represents the temperature and transport of warm Atlantic waters entering the Nordic Sea basin via the North Atlantic Drift and the large-scale Meridional Overturning Circulation. The single-sample resolution of the record is 2.5-10 years and age control is provided by Pb-210 and Cs-137 dating, identification of historic tephra, and a C-14 "wiggle-match" dating method in which the surface reservoir 14C age in the past is constrained rather than assumed, thereby eliminating a large source of chronological uncertainty. The oxygen isotope results indicate decade- to century-scale temperature variations of 1-2 degrees C in the shallow (similar to 50 m deep) subsurface which we find to be strongly correlated with various proxies of past solar activity. The correlations are synchronous to within the timescale uncertainties of the ocean and solar proxy records, which vary among the records and in time with a range of about 5-30 years. The observed ocean temperature response is larger than expected based on simple thermodynamic considerations, indicating that there is dynamical response of the high-latitude ocean to the Sun. Correlations of our results with a gridded temperature reconstruction for Europe are greater in central Europe than in coastal regions, suggesting that the temperature and transport of warm Atlantic waters entering the Nordic Basin and the pattern of temperature variability over Europe are both the proximate responses to a change in the atmospheric circulation, consistent with a forced shift in the primary modes of high-latitude atmospheric variability. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Geophysical Research
volume
115
publisher
American Geophysical Union
external identifiers
  • wos:000285465500005
  • scopus:78650464865
ISSN
2156-2202
DOI
10.1029/2010JC006264
project
MERGE
language
English
LU publication?
yes
id
9aa6c1f3-7e97-4d36-a6b0-d0141f7bcac0 (old id 1764489)
date added to LUP
2011-03-02 15:27:38
date last changed
2018-07-08 03:15:22
@article{9aa6c1f3-7e97-4d36-a6b0-d0141f7bcac0,
  abstract     = {Abstract: We report on a 1000 year long oxygen isotope record in sediments of the eastern Norwegian Sea which, we argue, represents the temperature and transport of warm Atlantic waters entering the Nordic Sea basin via the North Atlantic Drift and the large-scale Meridional Overturning Circulation. The single-sample resolution of the record is 2.5-10 years and age control is provided by Pb-210 and Cs-137 dating, identification of historic tephra, and a C-14 "wiggle-match" dating method in which the surface reservoir 14C age in the past is constrained rather than assumed, thereby eliminating a large source of chronological uncertainty. The oxygen isotope results indicate decade- to century-scale temperature variations of 1-2 degrees C in the shallow (similar to 50 m deep) subsurface which we find to be strongly correlated with various proxies of past solar activity. The correlations are synchronous to within the timescale uncertainties of the ocean and solar proxy records, which vary among the records and in time with a range of about 5-30 years. The observed ocean temperature response is larger than expected based on simple thermodynamic considerations, indicating that there is dynamical response of the high-latitude ocean to the Sun. Correlations of our results with a gridded temperature reconstruction for Europe are greater in central Europe than in coastal regions, suggesting that the temperature and transport of warm Atlantic waters entering the Nordic Basin and the pattern of temperature variability over Europe are both the proximate responses to a change in the atmospheric circulation, consistent with a forced shift in the primary modes of high-latitude atmospheric variability.},
  author       = {Sejrup, H.P. and Lehman, S.J. and Haflidason, H. and Noone, D. and Muscheler, Raimund and Berstad, I.M. and Andrews, J.T.},
  issn         = {2156-2202},
  language     = {eng},
  publisher    = {American Geophysical Union},
  series       = {Journal of Geophysical Research},
  title        = {Response of Norwegian Sea temperature to solar forcing since 1000 AD},
  url          = {http://dx.doi.org/10.1029/2010JC006264},
  volume       = {115},
  year         = {2010},
}