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Title: Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010
Authors: Esnaola, G.; Saenz, J.; Zorita, E.; Fontan, A.; Valencia, V.; Lazure, P.
Citation: OCEAN SCIENCE, 2013, 9, 655-679
Abstract: The combination of remotely sensed gappy Sea surface temperature (SST) images with the missing data filling DINEOF (data interpolating empirical orthogonal functions) technique, followed by a principal component analysis of the reconstructed data, has been used to identify the time evolution and the daily scale variability of the wintertime surface signal of the Iberian Poleward Current (IPC), or Navidad, during the 1981-2010 period. An exhaustive comparison with the existing bibliography, and the vertical temperature and salinity profiles related to its extremes over the Bay of Biscay area, show that the obtained time series accurately reflect the IPC-Navidad variability. Once a time series for the evolution of the SST signal of the current over the last decades is well established, this time series is used to propose a physical mechanism in relation to the variability of the IPC-Navidad, involving both atmospheric and oceanic variables. According to the proposed mechanism, an atmospheric circulation anomaly observed in both the 500 hPa and the surface levels generates atmospheric surface level pressure, wind-stress and heat-flux anomalies. In turn, those surface level atmospheric anomalies induce mutually coherent SST and sea level anomalies over the North Atlantic area, and locally, in the Bay of Biscay area. These anomalies, both locally over the Bay of Biscay area and over the North Atlantic, are in agreement with several mechanisms that have separately been related to the variability of the IPC-Navidad, i.e. the south-westerly winds, the joint effect of baroclinicity and relief (JEBAR) effect, the topographic beta effect and a weakened North Atlantic gyre.
Keywords: EASTERN NORTH-ATLANTIC; IBERIAN POLEWARD CURRENT; HEAT-FLUX ANOMALIES; CENTRAL WATER; ATMOSPHERIC CIRCULATION; PHYSICAL PROCESSES; DECADAL CHANGES; SLOPE CURRENTS; OCEAN MARGIN; RECONSTRUCTION
Issue Date: 2013
Publisher: COPERNICUS GESELLSCHAFT MBH
Type: Article
Language: English
DOI: 10.5194/os-9-655-2013
URI: http://dspace.azti.es/handle/24689/565
ISSN: 1812-0784
Funder: NASA Earth Science MEaSUREs DISCOVER Project
AMSR-E Science Team
Cnes
Fundacion Centros Tecnologicos Inaki Goenaga
Spanish National R+D+I Programme [CGL2008-03321]
University of the Basque Country [UFI 11/55, PPH12/01, GIU 11/01]
Basque Government (Department of Agriculture, Fisheries and Food)
Appears in Publication types:Artículos científicos



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