On the movements of the North Atlantic Subpolar Front in the preinstrumental past
Author Posting. © American Meteorological Society, 2016. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 29 (2016): 1545-1571, doi:10.1175/JCLI-D-15-0509.1. Three sedimen...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/7903 2023-05-15T17:22:52+02:00 On the movements of the North Atlantic Subpolar Front in the preinstrumental past Marchal, Olivier Waelbroeck, Claire Colin de Verdiere, Alain 2016-02-19 https://hdl.handle.net/1912/7903 en_US eng American Meteorological Society https://doi.org/10.1175/JCLI-D-15-0509.1 Journal of Climate 29 (2016): 1545-1571 https://hdl.handle.net/1912/7903 doi:10.1175/JCLI-D-15-0509.1 Journal of Climate 29 (2016): 1545-1571 doi:10.1175/JCLI-D-15-0509.1 Geographic location/entity North Atlantic Ocean Circulation/ Dynamics Fronts Mathematical and statistical techniques Inverse methods Kalman filters Variability Climate variability Oceanic variability Article 2016 ftwhoas https://doi.org/10.1175/JCLI-D-15-0509.1 2022-05-28T22:59:32Z Author Posting. © American Meteorological Society, 2016. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 29 (2016): 1545-1571, doi:10.1175/JCLI-D-15-0509.1. Three sediment records of sea surface temperature (SST) are analyzed that originate from distant locations in the North Atlantic, have centennial-to-multicentennial resolution, are based on the same reconstruction method and chronological assumptions, and span the past 15 000 yr. Using recursive least squares techniques, an estimate of the time-dependent North Atlantic SST field over the last 15 kyr is sought that is consistent with both the SST records and a surface ocean circulation model, given estimates of their respective error (co)variances. Under the authors’ assumptions about data and model errors, it is found that the 10°C mixed layer isotherm, which approximately traces the modern Subpolar Front, would have moved by ~15° of latitude southward (northward) in the eastern North Atlantic at the onset (termination) of the Younger Dryas cold interval (YD), a result significant at the level of two standard deviations in the isotherm position. In contrast, meridional movements of the isotherm in the Newfoundland basin are estimated to be small and not significant. Thus, the isotherm would have pivoted twice around a region southeast of the Grand Banks, with a southwest–northeast orientation during the warm intervals of the Bølling–Allerød and the Holocene and a more zonal orientation and southerly position during the cold interval of the YD. This study provides an assessment of the significance of similar previous inferences and illustrates the potential of recursive least squares in paleoceanography. OM acknowledges support from the U.S. National Science Foundation. CW acknowledges support from the European Research Council ERC Grant ACCLIMATE 339108. 2016-08-19 Article in Journal/Newspaper Newfoundland North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Journal of Climate 29 4 1545 1571 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Geographic location/entity North Atlantic Ocean Circulation/ Dynamics Fronts Mathematical and statistical techniques Inverse methods Kalman filters Variability Climate variability Oceanic variability |
spellingShingle |
Geographic location/entity North Atlantic Ocean Circulation/ Dynamics Fronts Mathematical and statistical techniques Inverse methods Kalman filters Variability Climate variability Oceanic variability Marchal, Olivier Waelbroeck, Claire Colin de Verdiere, Alain On the movements of the North Atlantic Subpolar Front in the preinstrumental past |
topic_facet |
Geographic location/entity North Atlantic Ocean Circulation/ Dynamics Fronts Mathematical and statistical techniques Inverse methods Kalman filters Variability Climate variability Oceanic variability |
description |
Author Posting. © American Meteorological Society, 2016. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 29 (2016): 1545-1571, doi:10.1175/JCLI-D-15-0509.1. Three sediment records of sea surface temperature (SST) are analyzed that originate from distant locations in the North Atlantic, have centennial-to-multicentennial resolution, are based on the same reconstruction method and chronological assumptions, and span the past 15 000 yr. Using recursive least squares techniques, an estimate of the time-dependent North Atlantic SST field over the last 15 kyr is sought that is consistent with both the SST records and a surface ocean circulation model, given estimates of their respective error (co)variances. Under the authors’ assumptions about data and model errors, it is found that the 10°C mixed layer isotherm, which approximately traces the modern Subpolar Front, would have moved by ~15° of latitude southward (northward) in the eastern North Atlantic at the onset (termination) of the Younger Dryas cold interval (YD), a result significant at the level of two standard deviations in the isotherm position. In contrast, meridional movements of the isotherm in the Newfoundland basin are estimated to be small and not significant. Thus, the isotherm would have pivoted twice around a region southeast of the Grand Banks, with a southwest–northeast orientation during the warm intervals of the Bølling–Allerød and the Holocene and a more zonal orientation and southerly position during the cold interval of the YD. This study provides an assessment of the significance of similar previous inferences and illustrates the potential of recursive least squares in paleoceanography. OM acknowledges support from the U.S. National Science Foundation. CW acknowledges support from the European Research Council ERC Grant ACCLIMATE 339108. 2016-08-19 |
format |
Article in Journal/Newspaper |
author |
Marchal, Olivier Waelbroeck, Claire Colin de Verdiere, Alain |
author_facet |
Marchal, Olivier Waelbroeck, Claire Colin de Verdiere, Alain |
author_sort |
Marchal, Olivier |
title |
On the movements of the North Atlantic Subpolar Front in the preinstrumental past |
title_short |
On the movements of the North Atlantic Subpolar Front in the preinstrumental past |
title_full |
On the movements of the North Atlantic Subpolar Front in the preinstrumental past |
title_fullStr |
On the movements of the North Atlantic Subpolar Front in the preinstrumental past |
title_full_unstemmed |
On the movements of the North Atlantic Subpolar Front in the preinstrumental past |
title_sort |
on the movements of the north atlantic subpolar front in the preinstrumental past |
publisher |
American Meteorological Society |
publishDate |
2016 |
url |
https://hdl.handle.net/1912/7903 |
genre |
Newfoundland North Atlantic |
genre_facet |
Newfoundland North Atlantic |
op_source |
Journal of Climate 29 (2016): 1545-1571 doi:10.1175/JCLI-D-15-0509.1 |
op_relation |
https://doi.org/10.1175/JCLI-D-15-0509.1 Journal of Climate 29 (2016): 1545-1571 https://hdl.handle.net/1912/7903 doi:10.1175/JCLI-D-15-0509.1 |
op_doi |
https://doi.org/10.1175/JCLI-D-15-0509.1 |
container_title |
Journal of Climate |
container_volume |
29 |
container_issue |
4 |
container_start_page |
1545 |
op_container_end_page |
1571 |
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1766109759286542336 |