Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary

SST variability on seasonal to sub-annual scales in the coastal region of South America between 30° and 39°S, largely influenced by the Rio de la Plata estuary's plume, and its relation to wind variability are explored. Data are six years of daily ensembles of gridded satellite SST and sea surf...

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Autores principales: Simionato, C.G., Clara Tejedor, M.L., Campetella, C., Guerrero, R., Moreira, D.
Formato: JOUR
Materias:
Blended SST
Coastal processes
Sea surface interaction
Seasonal cycle
Sub-annual variability
Upwelling
El Nino-Southern Oscillation
freshwater input
runoff
satellite data
sea surface temperature
seasonal variation
spatial resolution
upwelling
wind profile
Rio de la Plata
Uruguay
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02784343_v30_n19_p1983_Simionato
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_02784343_v30_n19_p1983_Simionato2023-10-03T15:17:00Z Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary Simionato, C.G. Clara Tejedor, M.L. Campetella, C. Guerrero, R. Moreira, D. Blended SST Coastal processes Sea surface interaction Seasonal cycle Sub-annual variability Upwelling El Nino-Southern Oscillation freshwater input runoff satellite data sea surface temperature seasonal variation spatial resolution upwelling wind profile Rio de la Plata Uruguay SST variability on seasonal to sub-annual scales in the coastal region of South America between 30° and 39°S, largely influenced by the Rio de la Plata estuary's plume, and its relation to wind variability are explored. Data are six years of daily ensembles of gridded satellite SST and sea surface winds with spatial resolutions of about 11 and 25. km, respectively. Observations from oceanographic cruises are used to validate the results. It is found that the seasonal cycle can be explained in terms of two modes. The first one, characterizing fall-early winter/spring-early summer, is related to the radiative cycle. The second one, corresponding to late summer and winter, displays warm/cold anomalies along the Uruguayan coast forced by the prevailing winds during those seasons. In the upper estuary and the northern part of the area of influence of the freshwater plume, variability in sub-annual scales is significant. A large portion of this variance is related to zonal wind anomalies that force warm/cold SSTs along that coast. Cold anomalies of up to -5 °C occur under anomalously intense easterly winds, indicating upwelling. These events are very frequent and show large persistence, occurring up to one and a half months. They also display a marked seasonal cycle - being more frequent in late spring and summer - large inter-annual variability and seem to be modulated by the continental runoff. When discharge is low, the freshwater plume retracts to the west, reducing the inner-shelf stratification and increasing the likelihood of a full upwelling to the surface. In winter, short time-scale SST variability is mostly due to variability in the atmospheric cold fronts crossing the region. Weaker or less frequent (stronger or more frequent) fronts produce a generalized warming (cooling) over the region. As the estuary heats (colds) faster than the shelf, a warm (cold) anomaly develops in the upper Río de la Plata. On inter-annual time scales, probably because ENSO activity was weak during the studied period, SST variability was not important. © 2010 Elsevier Ltd. Fil:Simionato, C.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Clara Tejedor, M.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Campetella, 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_02784343_v30_n19_p1983_Simionato
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Blended SST
Coastal processes
Sea surface interaction
Seasonal cycle
Sub-annual variability
Upwelling
El Nino-Southern Oscillation
freshwater input
runoff
satellite data
sea surface temperature
seasonal variation
spatial resolution
upwelling
wind profile
Rio de la Plata
Uruguay
spellingShingle Blended SST
Coastal processes
Sea surface interaction
Seasonal cycle
Sub-annual variability
Upwelling
El Nino-Southern Oscillation
freshwater input
runoff
satellite data
sea surface temperature
seasonal variation
spatial resolution
upwelling
wind profile
Rio de la Plata
Uruguay
Simionato, C.G.
Clara Tejedor, M.L.
Campetella, C.
Guerrero, R.
Moreira, D.
Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary
topic_facet Blended SST
Coastal processes
Sea surface interaction
Seasonal cycle
Sub-annual variability
Upwelling
El Nino-Southern Oscillation
freshwater input
runoff
satellite data
sea surface temperature
seasonal variation
spatial resolution
upwelling
wind profile
Rio de la Plata
Uruguay
description SST variability on seasonal to sub-annual scales in the coastal region of South America between 30° and 39°S, largely influenced by the Rio de la Plata estuary's plume, and its relation to wind variability are explored. Data are six years of daily ensembles of gridded satellite SST and sea surface winds with spatial resolutions of about 11 and 25. km, respectively. Observations from oceanographic cruises are used to validate the results. It is found that the seasonal cycle can be explained in terms of two modes. The first one, characterizing fall-early winter/spring-early summer, is related to the radiative cycle. The second one, corresponding to late summer and winter, displays warm/cold anomalies along the Uruguayan coast forced by the prevailing winds during those seasons. In the upper estuary and the northern part of the area of influence of the freshwater plume, variability in sub-annual scales is significant. A large portion of this variance is related to zonal wind anomalies that force warm/cold SSTs along that coast. Cold anomalies of up to -5 °C occur under anomalously intense easterly winds, indicating upwelling. These events are very frequent and show large persistence, occurring up to one and a half months. They also display a marked seasonal cycle - being more frequent in late spring and summer - large inter-annual variability and seem to be modulated by the continental runoff. When discharge is low, the freshwater plume retracts to the west, reducing the inner-shelf stratification and increasing the likelihood of a full upwelling to the surface. In winter, short time-scale SST variability is mostly due to variability in the atmospheric cold fronts crossing the region. Weaker or less frequent (stronger or more frequent) fronts produce a generalized warming (cooling) over the region. As the estuary heats (colds) faster than the shelf, a warm (cold) anomaly develops in the upper Río de la Plata. On inter-annual time scales, probably because ENSO activity was weak during the studied period, SST variability was not important. © 2010 Elsevier Ltd.
format JOUR
author Simionato, C.G.
Clara Tejedor, M.L.
Campetella, C.
Guerrero, R.
Moreira, D.
author_facet Simionato, C.G.
Clara Tejedor, M.L.
Campetella, C.
Guerrero, R.
Moreira, D.
author_sort Simionato, C.G.
title Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary
title_short Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary
title_full Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary
title_fullStr Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary
title_full_unstemmed Patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the Río de la Plata estuary
title_sort patterns of sea surface temperature variability on seasonal to sub-annual scales at and offshore the río de la plata estuary
url http://hdl.handle.net/20.500.12110/paper_02784343_v30_n19_p1983_Simionato
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