Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations

Mostrar todas las versiones(2)

A long term simulation of the barotropic circulation in the Río de la Plata estuary was performed with the aim of identifying the characteristic patterns of sea surface height (SSH) variability from synoptic to inter-annual time scales and their forcing mechanisms. Hamburg Shelf Ocean Model (HamSOM)...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Meccia, V.L., Simionato, C.G., Fiore, M.E., D'Onofrio, E.E., Dragani, W.C.
Formato: JOUR
Materias:
annual variation
atmospheric forcing
atmospheric pressure
barotropic motion
cyclogenesis
El Nino-Southern Oscillation
numerical model
runoff
sea surface height
storm surge
variance analysis
wind direction
wind velocity
Rio de la Plata
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02727714_v85_n2_p327_Meccia
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02727714_v85_n2_p327_Meccia
record_format dspace
spelling todo:paper_02727714_v85_n2_p327_Meccia2023-10-03T15:15:23Z Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations Meccia, V.L. Simionato, C.G. Fiore, M.E. D'Onofrio, E.E. Dragani, W.C. annual variation atmospheric forcing atmospheric pressure barotropic motion cyclogenesis El Nino-Southern Oscillation numerical model runoff sea surface height storm surge variance analysis wind direction wind velocity Rio de la Plata South America A long term simulation of the barotropic circulation in the Río de la Plata estuary was performed with the aim of identifying the characteristic patterns of sea surface height (SSH) variability from synoptic to inter-annual time scales and their forcing mechanisms. Hamburg Shelf Ocean Model (HamSOM), forced by tides, monthly mean runoffs and 4-daily 10 m winds and surface atmospheric pressure from the National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis was run. The solution was analyzed for the period 1965-2004. Inter-annual variability accounts for almost 10% of the variance. The first EOF mode of SSH variability on this time scale is associated with a mean anomaly of approximately 0.25 m at the upper estuary forced by both runoff and winds, which seems to be strongly associated with the ENSO cycles. Other two modes, with periodicities around 2.5 and 10 years were also found. Even though they are linked to weaker SSH anomalies, they are consistent with inter-annual modes of wind variability reported by other authors. Those modes are important, particularly if they act in phase, because they can provide a background for stronger surges. In contrast with the salinity field, SSH variability on seasonal time scales accounts for a very small percentage of variance and it is the combination of an annual and a semi-annual signal forced by winds and runoff, respectively. Approximately 90% of the variance is due to wind driven variability on sub-annual time scales. The most significant SSH anomalies in this band are associated with cyclogenetic events in the atmosphere, occurring either over Uruguay or over the Patagonian Shelf, whereas the strengthening or weakening of the semi-permanent South Atlantic anticyclone displays a relatively smaller influence. In agreement with previous publications, the estuary's spatial patterns in response to short-scale wind variability seem to be determined by wind direction more than by wind speed. © 2009 Elsevier Ltd. All rights reserved. Fil:Meccia, V.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Simionato, C.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Dragani, W.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02727714_v85_n2_p327_Meccia
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic annual variation
atmospheric forcing
atmospheric pressure
barotropic motion
cyclogenesis
El Nino-Southern Oscillation
numerical model
runoff
sea surface height
storm surge
variance analysis
wind direction
wind velocity
Rio de la Plata
South America
spellingShingle annual variation
atmospheric forcing
atmospheric pressure
barotropic motion
cyclogenesis
El Nino-Southern Oscillation
numerical model
runoff
sea surface height
storm surge
variance analysis
wind direction
wind velocity
Rio de la Plata
South America
Meccia, V.L.
Simionato, C.G.
Fiore, M.E.
D'Onofrio, E.E.
Dragani, W.C.
Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations
topic_facet annual variation
atmospheric forcing
atmospheric pressure
barotropic motion
cyclogenesis
El Nino-Southern Oscillation
numerical model
runoff
sea surface height
storm surge
variance analysis
wind direction
wind velocity
Rio de la Plata
South America
description A long term simulation of the barotropic circulation in the Río de la Plata estuary was performed with the aim of identifying the characteristic patterns of sea surface height (SSH) variability from synoptic to inter-annual time scales and their forcing mechanisms. Hamburg Shelf Ocean Model (HamSOM), forced by tides, monthly mean runoffs and 4-daily 10 m winds and surface atmospheric pressure from the National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis was run. The solution was analyzed for the period 1965-2004. Inter-annual variability accounts for almost 10% of the variance. The first EOF mode of SSH variability on this time scale is associated with a mean anomaly of approximately 0.25 m at the upper estuary forced by both runoff and winds, which seems to be strongly associated with the ENSO cycles. Other two modes, with periodicities around 2.5 and 10 years were also found. Even though they are linked to weaker SSH anomalies, they are consistent with inter-annual modes of wind variability reported by other authors. Those modes are important, particularly if they act in phase, because they can provide a background for stronger surges. In contrast with the salinity field, SSH variability on seasonal time scales accounts for a very small percentage of variance and it is the combination of an annual and a semi-annual signal forced by winds and runoff, respectively. Approximately 90% of the variance is due to wind driven variability on sub-annual time scales. The most significant SSH anomalies in this band are associated with cyclogenetic events in the atmosphere, occurring either over Uruguay or over the Patagonian Shelf, whereas the strengthening or weakening of the semi-permanent South Atlantic anticyclone displays a relatively smaller influence. In agreement with previous publications, the estuary's spatial patterns in response to short-scale wind variability seem to be determined by wind direction more than by wind speed. © 2009 Elsevier Ltd. All rights reserved.
format JOUR
author Meccia, V.L.
Simionato, C.G.
Fiore, M.E.
D'Onofrio, E.E.
Dragani, W.C.
author_facet Meccia, V.L.
Simionato, C.G.
Fiore, M.E.
D'Onofrio, E.E.
Dragani, W.C.
author_sort Meccia, V.L.
title Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations
title_short Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations
title_full Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations
title_fullStr Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations
title_full_unstemmed Sea surface height variability in the Rio de la Plata estuary from synoptic to inter-annual scales: Results of numerical simulations
title_sort sea surface height variability in the rio de la plata estuary from synoptic to inter-annual scales: results of numerical simulations
url http://hdl.handle.net/20.500.12110/paper_02727714_v85_n2_p327_Meccia
work_keys_str_mv AT mecciavl seasurfaceheightvariabilityintheriodelaplataestuaryfromsynoptictointerannualscalesresultsofnumericalsimulations
AT simionatocg seasurfaceheightvariabilityintheriodelaplataestuaryfromsynoptictointerannualscalesresultsofnumericalsimulations
AT fioreme seasurfaceheightvariabilityintheriodelaplataestuaryfromsynoptictointerannualscalesresultsofnumericalsimulations
AT donofrioee seasurfaceheightvariabilityintheriodelaplataestuaryfromsynoptictointerannualscalesresultsofnumericalsimulations
AT draganiwc seasurfaceheightvariabilityintheriodelaplataestuaryfromsynoptictointerannualscalesresultsofnumericalsimulations
_version_ 1807317058444066816

Ejemplares similares