Deep ocean hydrographical variability and circulation in the north-west Iberia

Tesis con mención internacional

Detalles Bibliográficos
Autor: Prieto Bravo, Eva
Tipo de recurso: tesis doctoral
Fecha de publicación:2014
País:España
Institución:Universidad de Oviedo (UNIOVI)
Repositorio:RUO. Repositorio Institucional de la Universidad de Oviedo
Idioma:inglés
OAI Identifier:oai:digibuo.uniovi.es:10651/30637
Acceso en línea:http://hdl.handle.net/10651/30637
Access Level:acceso abierto
Palabra clave:Física fundamental y aplicada
Oceanografía física
Hidrografía
Cambio climático
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oai_identifier_str oai:digibuo.uniovi.es:10651/30637
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Deep ocean hydrographical variability and circulation in the north-west Iberia
Variabilidad hidrográfica y circulación del océano profundo en el noroeste de la Península Ibérica
title Deep ocean hydrographical variability and circulation in the north-west Iberia
spellingShingle Deep ocean hydrographical variability and circulation in the north-west Iberia
Prieto Bravo, Eva
Física fundamental y aplicada
Oceanografía física
Hidrografía
Cambio climático
title_short Deep ocean hydrographical variability and circulation in the north-west Iberia
title_full Deep ocean hydrographical variability and circulation in the north-west Iberia
title_fullStr Deep ocean hydrographical variability and circulation in the north-west Iberia
title_full_unstemmed Deep ocean hydrographical variability and circulation in the north-west Iberia
title_sort Deep ocean hydrographical variability and circulation in the north-west Iberia
dc.creator.none.fl_str_mv Prieto Bravo, Eva
author Prieto Bravo, Eva
author_facet Prieto Bravo, Eva
author_role author
dc.contributor.none.fl_str_mv Fernández Díaz, Julio Manuel
González-Pola Muñiz, César Manuel
Física, Departamento de
dc.subject.none.fl_str_mv Física fundamental y aplicada
Oceanografía física
Hidrografía
Cambio climático
topic Física fundamental y aplicada
Oceanografía física
Hidrografía
Cambio climático
description Tesis con mención internacional
publishDate 2014
dc.date.none.fl_str_mv 2014
2014-12-04
dc.type.none.fl_str_mv doctoral thesis
http://purl.org/coar/resource_type/c_db06
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
dc.identifier.none.fl_str_mv http://hdl.handle.net/10651/30637
url http://hdl.handle.net/10651/30637
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:RUO. Repositorio Institucional de la Universidad de Oviedo
instname:Universidad de Oviedo (UNIOVI)
instname_str Universidad de Oviedo (UNIOVI)
reponame_str RUO. Repositorio Institucional de la Universidad de Oviedo
collection RUO. Repositorio Institucional de la Universidad de Oviedo
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869407207498448896
spelling Deep ocean hydrographical variability and circulation in the north-west IberiaVariabilidad hidrográfica y circulación del océano profundo en el noroeste de la Península IbéricaPrieto Bravo, EvaFísica fundamental y aplicadaOceanografía físicaHidrografíaCambio climáticoTesis con mención internacionalOceanic hydrography of the north-easternmost region of the North Atlantic subtropical gyre has been monitored since 2003 for the whole water column (>5000 m) by three sections extending zonally 200 nautical miles (nm) westwards of Cape Finisterre (43°N, western Iberia margin), and meridionally 100 nm off Cape Ortegal (8°W, southwestern Bay of Biscay) and 100 nm off Santander (3°47'W, southeastern Bay of Biscay), allowing for the analysis of the deep ocean variability from seasonal to interannual scales. Semiannual time series of the Finisterre oceanographic section from 2003 to 2010 have shown that all water masses down to the permanent thermocline (2000 dbar) exhibit a consistent seasonal signature in their thermohaline properties with notable asymmetry between the slope region and the outer ocean. In summertime, Mediterranean Water (MW) gets tightly attached against the slope and is uplifted, reinforcing its thermohaline signature and diminishing its presence at the outer ocean. In wintertime the situation reverses, MW seems to detach from the slope and spreads out to the open ocean, even being observed a secondary branch around the Galicia Bank. Thermohaline seasonality at depth shows values up to 0.4°C and 0.08 in salinity at the lower MW, of the order of 20% of the overall interannual variability observed during the whole period. Decomposition of thermohaline changes at isobaric levels to changes along isoneutral surfaces and changes due to vertical displacements helped analyze the physical processes behind the observed seasonality in terms of (1) the large-scale seasonality of the subtropical gyre in response to the seasonal migration of the subtropical high pressure system, (2) the continental slope dynamics, characterized by summer upwelling, winter development of the Iberian Poleward Current and Mediterranean water spreading, and (3) the possible influence of seasonal changes of water mass properties at their formation sources. Once signals were de-seasonalized, time series of property interannual changes of the different water masses were analyzed. Correlation of series in the vertical and among sections, autocorrelation and estimates of the effect of the noise induced by the mesoscale field, all indicate that observed signatures are robust changes of water masses at the regional scale. The hydrographic timeseries are not characterized by smooth trends but instead by shifts that persist through consecutive cruises. The most notable features include a shift to more saline central waters around 2005 after which they remained stable, and a decrease in thermohaline properties of the Labrador Sea Water from autumn 2008 to 2010. Years with a strong winter North Atlantic Oscillation (NAO) index are characterized by shifts in thermohaline properties across most of the intermediate levels, with the most notable event being the warming and increasing salinity that followed the large NAO index drop of 2010. These observations are consistent with current understanding of the large-scale functioning of the North Atlantic, which predicts a northeastwards expansion of subtropical temperate waters in the eastern boundary as a response to negative NAO forcing. February and September cruises in 2008, exhibiting the typical winter/summer thermohaline distinct structures and also having a quite complete set of direct velocity measurements ---Lowered Acoustic Current Profiler (LADCP), ship hull ADCP and an active mooring line--- were explored to estimate transports across the section and compare different methods available. Three regions were evidenced, the continental shelf break-slope characterized by northwards transport, southwards circulation across most of the passage to the Galician Bank summit and then northwards flow again west of the seamount. Currents across the passage from Finisterre to the Galician Bank were markedly barotropic so mesoscale structures evidenced by geostrophy were being advected across the passage.Fernández Díaz, Julio ManuelGonzález-Pola Muñiz, César ManuelFísica, Departamento de20142014-12-04doctoral thesishttp://purl.org/coar/resource_type/c_db06NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/doctoralThesishttp://hdl.handle.net/10651/30637reponame:RUO. Repositorio Institucional de la Universidad de Oviedoinstname:Universidad de Oviedo (UNIOVI)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:digibuo.uniovi.es:10651/306372026-06-07T06:38:51Z
score 15,301629

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