Surface wind variability on seasonal and interannual scales over RíO de la Plata area

Previous works show that wind forcing is the main source of circulation seasonal variability in the Río de la Plata estuary, located on the southeastern coast of South America. Wind forcing exceeds by far the role of fresh water discharges. However, due to a lack of enough observations, the features...

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Detalles Bibliográficos
Autores principales: Simionato, Claudia Gloria, Vera, Carolina Susana
Publicado: 2005
Materias:
41-30° S; 58-47° W
Estuaries
Interannual variability
Northern Argentine Continental Shelf
Río de la Plata
Seasonality
Wind variability
temporal variation
wind
Rio de la Plata
South America
Western Hemisphere
World
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07490208_v21_n4_p770_Simionato
http://hdl.handle.net/20.500.12110/paper_07490208_v21_n4_p770_Simionato
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_07490208_v21_n4_p770_Simionato
record_format dspace
spelling paper:paper_07490208_v21_n4_p770_Simionato2023-06-08T15:45:18Z Surface wind variability on seasonal and interannual scales over RíO de la Plata area Simionato, Claudia Gloria Vera, Carolina Susana 41-30° S; 58-47° W Estuaries Interannual variability Northern Argentine Continental Shelf Río de la Plata Seasonality Wind variability temporal variation wind Rio de la Plata South America Western Hemisphere World Previous works show that wind forcing is the main source of circulation seasonal variability in the Río de la Plata estuary, located on the southeastern coast of South America. Wind forcing exceeds by far the role of fresh water discharges. However, due to a lack of enough observations, the features and causes of surface wind variability are not well understood yet. Therefore this paper presents a comprehensive study of surface wind variability over the Río de la Plata estuary using the National Center for Environmental Prediction-National Center for Atmospheric Research (NCEP/NCAR) reanalysis data between 1948 and 1997. It is expected that this study contributes to better understand, model and thus predict the estuary circulation. An onshore to offshore rotation characterizes the seasonal variations of the surface winds from summer to winter. A linear trend analysis shows a displacement of the summer-winter seasonal features to earlier months. On interannual time-scales, the first leading pattern describes east-west changes of surface winds that seems to be forced by the quasibiennial tropospheric oscillation excited in the western tropical Pacific and previously identified by many authors. The conditions over the South Atlantic and in particular the Río de la Plata are influenced by such oscillation through an atmospheric Rossby wave train propagating out of the tropics. This result is very important for its implication on the predictability levels in the region. The second leading mode is associated with anticyclonic/cyclonic wind rotations off the estuary on interannual times scales which are related with changes in both atmospheric and oceanic surface conditions at Southern Hemispher high-latitudes. Fil:Simionato, C.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vera, C.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07490208_v21_n4_p770_Simionato http://hdl.handle.net/20.500.12110/paper_07490208_v21_n4_p770_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 41-30° S; 58-47° W
Estuaries
Interannual variability
Northern Argentine Continental Shelf
Río de la Plata
Seasonality
Wind variability
temporal variation
wind
Rio de la Plata
South America
Western Hemisphere
World
spellingShingle 41-30° S; 58-47° W
Estuaries
Interannual variability
Northern Argentine Continental Shelf
Río de la Plata
Seasonality
Wind variability
temporal variation
wind
Rio de la Plata
South America
Western Hemisphere
World
Simionato, Claudia Gloria
Vera, Carolina Susana
Surface wind variability on seasonal and interannual scales over RíO de la Plata area
topic_facet 41-30° S; 58-47° W
Estuaries
Interannual variability
Northern Argentine Continental Shelf
Río de la Plata
Seasonality
Wind variability
temporal variation
wind
Rio de la Plata
South America
Western Hemisphere
World
description Previous works show that wind forcing is the main source of circulation seasonal variability in the Río de la Plata estuary, located on the southeastern coast of South America. Wind forcing exceeds by far the role of fresh water discharges. However, due to a lack of enough observations, the features and causes of surface wind variability are not well understood yet. Therefore this paper presents a comprehensive study of surface wind variability over the Río de la Plata estuary using the National Center for Environmental Prediction-National Center for Atmospheric Research (NCEP/NCAR) reanalysis data between 1948 and 1997. It is expected that this study contributes to better understand, model and thus predict the estuary circulation. An onshore to offshore rotation characterizes the seasonal variations of the surface winds from summer to winter. A linear trend analysis shows a displacement of the summer-winter seasonal features to earlier months. On interannual time-scales, the first leading pattern describes east-west changes of surface winds that seems to be forced by the quasibiennial tropospheric oscillation excited in the western tropical Pacific and previously identified by many authors. The conditions over the South Atlantic and in particular the Río de la Plata are influenced by such oscillation through an atmospheric Rossby wave train propagating out of the tropics. This result is very important for its implication on the predictability levels in the region. The second leading mode is associated with anticyclonic/cyclonic wind rotations off the estuary on interannual times scales which are related with changes in both atmospheric and oceanic surface conditions at Southern Hemispher high-latitudes.
author Simionato, Claudia Gloria
Vera, Carolina Susana
author_facet Simionato, Claudia Gloria
Vera, Carolina Susana
author_sort Simionato, Claudia Gloria
title Surface wind variability on seasonal and interannual scales over RíO de la Plata area
title_short Surface wind variability on seasonal and interannual scales over RíO de la Plata area
title_full Surface wind variability on seasonal and interannual scales over RíO de la Plata area
title_fullStr Surface wind variability on seasonal and interannual scales over RíO de la Plata area
title_full_unstemmed Surface wind variability on seasonal and interannual scales over RíO de la Plata area
title_sort surface wind variability on seasonal and interannual scales over río de la plata area
publishDate 2005
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07490208_v21_n4_p770_Simionato
http://hdl.handle.net/20.500.12110/paper_07490208_v21_n4_p770_Simionato
work_keys_str_mv AT simionatoclaudiagloria surfacewindvariabilityonseasonalandinterannualscalesoverriodelaplataarea
AT veracarolinasusana surfacewindvariabilityonseasonalandinterannualscalesoverriodelaplataarea
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