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A Multi-decadal Meridional Displacement of the Subpolar Front in the Newfoundland Basin : Volume 8, Issue 1 (15/02/2012)

By Núñez-riboni, I.

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Book Id: WPLBN0004020620
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: A Multi-decadal Meridional Displacement of the Subpolar Front in the Newfoundland Basin : Volume 8, Issue 1 (15/02/2012)  
Author: Núñez-riboni, I.
Volume: Vol. 8, Issue 1
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Jungclaus, J. H., Bersch, M., Haak, H., Núñez-Riboni, I., & Lohmann, K. (2012). A Multi-decadal Meridional Displacement of the Subpolar Front in the Newfoundland Basin : Volume 8, Issue 1 (15/02/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Max-Planck-Institut für Meteorologie, Bundesstr. 53, 20146 Hamburg, Germany. Observations since the 1950s show a multi-decadal cycle of a meridional displacement of the Subpolar Front (SPF) in the Newfoundland Basin (NFB) in the North Atlantic. The SPF displacement is associated with corresponding variations in the path of the North Atlantic Current. We use the ocean general circulation model MPIOM with enhanced horizontal and vertical resolutions and forced with NCEP/NCAR reanalysis data to study the relation of the SPF displacement to atmospheric forcing, intensities of the subpolar gyre (SPG) and Meridional Overturning Circulation (MOC), and Labrador Sea Water (LSW) volume. The simulations indicate that the SPF displacement is associated with a circulation anomaly between the SPG and the subtropical gyre (STG), an inter-gyre gyre with a multi-decadal time scale. A sensitivity experiment indicates that both wind stress curl (WSC) and heat fluxes (which match LSW changes) contribute to the circulation anomalies in the frontal region and to the SPF displacement. An anticyclonic inter-gyre gyre is related to negative WSC and LSW anomalies and to a SPF north of its climatological position, indicating an expanding STG. A cyclonic inter-gyre gyre is related to positive WSC and LSW anomalies and a SPF south of its climatological position, indicating an expanding SPG. Therefore, the mean latitudinal position of the SPF in the NFB (a SPF index) could be an indicator of the amount of LSW in the inter-gyre region. Spreading of LSW anomalies intensifies the MOC, suggesting our SPF index as predictor of the MOC intensity at multi-decadal time scales. The meridional displacement of the SPF has a pronounced influence on the meridional heat transport, both on its gyre and overturning components.

Summary
A multi-decadal meridional displacement of the Subpolar Front in the Newfoundland Basin

Excerpt
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