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Provedor de dados:  ArchiMer
País:  France
Título:  On the Movements of the North Atlantic Subpolar Front in the Preinstrumental Past*
Autores:  Marchal, Olivier
Waelbroeck, Claire
Colin De Verdiere, Alain
Data:  2016-02-15
Ano:  2016
Palavras-chave:  Inverse methods
Kalman filters
Climate variability
Circulation/ Dynamics
Geographic location/entity
Oceanic variability
Variability
Mathematical and statistical techniques
Fronts
North Atlantic Ocean
Resumo:  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 degrees C mixed layer isotherm, which approximately traces the modern Subpolar Front, would have moved by ~15 degrees 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 Bolling-Allerod 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.
Tipo:  Text
Idioma:  Inglês
Identificador:  http://archimer.ifremer.fr/doc/00318/42922/42423.pdf

http://archimer.ifremer.fr/doc/00318/42922/42424.doc

DOI:10.1175/JCLI-D-15-0509.1

http://archimer.ifremer.fr/doc/00318/42922/
Editor:  Amer Meteorological Soc
Formato:  application/pdf
Fonte:  Journal Of Climate (0894-8755) (Amer Meteorological Soc), 2016-02-15 , Vol. 29 , N. 4 , P. 1545-1571
Direitos:  2016 American Meteorological Society

info:eu-repo/semantics/openAccess

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