A modelling framework for EBUS: from seasonal to decadal time scales

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dc.contributor.advisor Masina, Simona it_IT
dc.contributor.author Bonino, Giulia <1991> it_IT
dc.date.accessioned 2018-12-10 it_IT
dc.date.accessioned 2019-07-24T08:06:33Z
dc.date.available 2019-07-24T08:06:33Z
dc.date.issued 2019-03-22 it_IT
dc.identifier.uri http://hdl.handle.net/10579/14966
dc.description.abstract Along major Eastern Boundary Upwelling Systems (EBUS) local and seasonal changes in the equatorward wind stress (e.g. Ekman Upwelling) and cross-shore gradients of the wind (e.g. Ekman Pumping) are the main drivers of the three dimensional ocean circulation that controls coastal sea surface temperature (SST) and the upwelling of ocean tracers (e.g. nutrients). Through modulation of these local conditions, also climate modes seem to have an impact on upwelling, regulating the EBUS variability at interannual and decadal timescales. In light of the importance of the forcing, in a ocean modelling framework, the aims of this thesis are to understand the impact of different wind structures on the dynamics of SST and upwelling and, to detect and compare low-frequency variability and changes in EBUS. To achieve these objectives we performed long-term ocean hindcasts with the global ORCA025 configuration (25 km of horizontal resolution) of NEMO general circulation model forced by three atmospheric products, that differ for spatial resolution. The numerical results suggest that (1) coastal upwelling and Ekman pumping are locally forced by differences in alongshore wind stress and wind stress curl, respectively; (2) equatorward currents are intensified under enhanced wind stress condition, while poleward undercurrents respond to wind stress curl changes; (3) SST differences are mostly related to a stronger nearshore wind stress rather than incoming heat fluxes (4) global covariability across EBUS is not detected, at basin scale the El Niño–Southern Oscillation and its low frequency modulation exert influence on Pacific systems while the Atlantic Meridional Oscillation is the predominant mode over Atlantic domains. it_IT
dc.language.iso en it_IT
dc.publisher Università Ca' Foscari Venezia it_IT
dc.rights © Giulia Bonino, 2019 it_IT
dc.title A modelling framework for EBUS: from seasonal to decadal time scales it_IT
dc.title.alternative it_IT
dc.type Doctoral Thesis it_IT
dc.degree.name Scienza e gestione dei cambiamenti climatici it_IT
dc.degree.level Dottorato di Ricerca it_IT
dc.degree.grantor Dipartimento di Economia it_IT
dc.description.academicyear Dottorato - 31° Ciclo - 2015-2017 it_IT
dc.description.cycle 31 it_IT
dc.degree.coordinator Carraro, Carlo it_IT
dc.location.shelfmark D001914 it_IT
dc.location Venezia, Archivio Università Ca' Foscari, Tesi Dottorato it_IT
dc.rights.accessrights openAccess it_IT
dc.thesis.matricno 956212 it_IT
dc.format.pagenumber XVI, 119 p. : ill. it_IT
dc.description.note Cotutela con Centro Euro-Mediterraneo sui Cambiamenti Climatici (CMCC) it_IT
dc.degree.discipline it_IT
dc.contributor.co-advisor Iovino, Dorotea it_IT
dc.provenance.upload Giulia Bonino (956212@stud.unive.it), 2018-12-10 it_IT
dc.provenance.plagiarycheck Simona Masina (simona.masina@unive.it), 2019-01-18 it_IT

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