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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ftdoajarticles:oai:doaj.org/article:d436bc048244467b9eee717e0d8afadc 2023-05-15T17:29:46+02:00 Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010 G. Esnaola J. Sáenz E. Zorita A. Fontán V. Valencia P. Lazure 2013-07-01T00:00:00Z https://doi.org/10.5194/os-9-655-2013 https://doaj.org/article/d436bc048244467b9eee717e0d8afadc EN eng Copernicus Publications http://www.ocean-sci.net/9/655/2013/os-9-655-2013.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-9-655-2013 1812-0784 1812-0792 https://doaj.org/article/d436bc048244467b9eee717e0d8afadc Ocean Science, Vol 9, Iss 4, Pp 655-679 (2013) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2013 ftdoajarticles https://doi.org/10.5194/os-9-655-2013 2022-12-30T20:53:15Z 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 β effect and a weakened North Atlantic gyre. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Navidad ENVELOPE(-62.100,-62.100,-64.583,-64.583) Ocean Science 9 4 655 679 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 G. Esnaola J. Sáenz E. Zorita A. Fontán V. Valencia P. Lazure Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010 |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
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 β effect and a weakened North Atlantic gyre. |
format |
Article in Journal/Newspaper |
author |
G. Esnaola J. Sáenz E. Zorita A. Fontán V. Valencia P. Lazure |
author_facet |
G. Esnaola J. Sáenz E. Zorita A. Fontán V. Valencia P. Lazure |
author_sort |
G. Esnaola |
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 Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/os-9-655-2013 https://doaj.org/article/d436bc048244467b9eee717e0d8afadc |
long_lat |
ENVELOPE(-62.100,-62.100,-64.583,-64.583) |
geographic |
Navidad |
geographic_facet |
Navidad |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Ocean Science, Vol 9, Iss 4, Pp 655-679 (2013) |
op_relation |
http://www.ocean-sci.net/9/655/2013/os-9-655-2013.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-9-655-2013 1812-0784 1812-0792 https://doaj.org/article/d436bc048244467b9eee717e0d8afadc |
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_ |
1766124575843680256 |