Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010
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...
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ftunivpaisvasco:oai:addi.ehu.es:10810/11279 2023-05-15T17:29:15+02:00 Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010 Esnaola, G. Sáenz Aguirre, Jon Zorita, E. Fontán, A. Valencia, V. Lazure, P. 2013 http://hdl.handle.net/10810/11279 https://doi.org/10.5194/os-9-655-2013 eng eng Copernicus Gesellschaft MBH http://www.ocean-sci.net/9/655/2013/os-9-655-2013.html Ocean Science 9(4) : 655-679 (2013) 1812-0784 http://hdl.handle.net/10810/11279 doi:10.5194/os-9-655-2013 info:eu-repo/semantics/openAccess © Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License. CC-BY Eastern North Atlantic iberian poleward current heat flux anomalies central water atmospheric circulation physical processes decadal changes slope currents ocean margin reconstruction OCEANOGRAPHY PALEONTOLOGY info:eu-repo/semantics/article 2013 ftunivpaisvasco https://doi.org/10.5194/os-9-655-2013 2022-03-10T16:32:25Z 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. ERA-Interim data were obtained from the ECMWF data server (http://data.ecmwf.int/data). Pathfinder v5.2 data were provided by GHRSST and the US National Oceanographic Data Center. AMSR-E data are produced by Remote Sensing Systems and sponsored by the NASA Earth Science MEaSUREs DISCOVER Project and the AMSR-E Science Team. Data are available at ... Article in Journal/Newspaper North Atlantic ADDI: Repositorio Institucional de la Universidad del País Vasco (UPV) Navidad ENVELOPE(-62.100,-62.100,-64.583,-64.583) Ocean Science 9 4 655 679 |
institution |
Open Polar |
collection |
ADDI: Repositorio Institucional de la Universidad del País Vasco (UPV) |
op_collection_id |
ftunivpaisvasco |
language |
English |
topic |
Eastern North Atlantic iberian poleward current heat flux anomalies central water atmospheric circulation physical processes decadal changes slope currents ocean margin reconstruction OCEANOGRAPHY PALEONTOLOGY |
spellingShingle |
Eastern North Atlantic iberian poleward current heat flux anomalies central water atmospheric circulation physical processes decadal changes slope currents ocean margin reconstruction OCEANOGRAPHY PALEONTOLOGY Esnaola, G. Sáenz Aguirre, Jon Zorita, E. Fontán, A. Valencia, V. Lazure, P. Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010 |
topic_facet |
Eastern North Atlantic iberian poleward current heat flux anomalies central water atmospheric circulation physical processes decadal changes slope currents ocean margin reconstruction OCEANOGRAPHY PALEONTOLOGY |
description |
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. ERA-Interim data were obtained from the ECMWF data server (http://data.ecmwf.int/data). Pathfinder v5.2 data were provided by GHRSST and the US National Oceanographic Data Center. AMSR-E data are produced by Remote Sensing Systems and sponsored by the NASA Earth Science MEaSUREs DISCOVER Project and the AMSR-E Science Team. Data are available at ... |
format |
Article in Journal/Newspaper |
author |
Esnaola, G. Sáenz Aguirre, Jon Zorita, E. Fontán, A. Valencia, V. Lazure, P. |
author_facet |
Esnaola, G. Sáenz Aguirre, Jon Zorita, E. Fontán, A. Valencia, V. Lazure, P. |
author_sort |
Esnaola, G. |
title |
Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010 |
title_short |
Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010 |
title_full |
Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010 |
title_fullStr |
Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010 |
title_full_unstemmed |
Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010 |
title_sort |
daily scale wintertime sea surface temperature and ipc-navidad variability in the southern bay of biscay from 1981 to 2010 |
publisher |
Copernicus Gesellschaft MBH |
publishDate |
2013 |
url |
http://hdl.handle.net/10810/11279 https://doi.org/10.5194/os-9-655-2013 |
long_lat |
ENVELOPE(-62.100,-62.100,-64.583,-64.583) |
geographic |
Navidad |
geographic_facet |
Navidad |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://www.ocean-sci.net/9/655/2013/os-9-655-2013.html Ocean Science 9(4) : 655-679 (2013) 1812-0784 http://hdl.handle.net/10810/11279 doi:10.5194/os-9-655-2013 |
op_rights |
info:eu-repo/semantics/openAccess © Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/os-9-655-2013 |
container_title |
Ocean Science |
container_volume |
9 |
container_issue |
4 |
container_start_page |
655 |
op_container_end_page |
679 |
_version_ |
1766122920011104256 |