Mechanisms associated with large daily rainfall events in Northeast Brazil

The mechanisms resulting in large daily rainfall events in Northeast Brazil are analyzed using data filtering to exclude periods longer than 30 days. Composites of circulation fields that include all independent events do not reveal any obvious forcing mechanisms as multiple patterns contribute to N...

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Autor principal:	Vera, Carolina Susana
Publicado:	2011
Materias:	Extreme events Kelvin waves Rainfall South America Annual rainfall Daily rainfall Data filtering Midlatitudes Northeast Brazil Precipitation anomalies Precipitation events Precipitation variability Spatial structure Wave train Coastal zones Gravity waves Locomotives Railroad cars Rain atmospheric convection extreme event formation mechanism Kelvin wave precipitation intensity rainfall Brazil
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08948755_v24_n2_p376_Liebmann http://hdl.handle.net/20.500.12110/paper_08948755_v24_n2_p376_Liebmann
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_08948755_v24_n2_p376_Liebmann
record_format	dspace
spelling	paper:paper_08948755_v24_n2_p376_Liebmann2023-06-08T15:47:55Z Mechanisms associated with large daily rainfall events in Northeast Brazil Vera, Carolina Susana Extreme events Kelvin waves Rainfall South America Annual rainfall Daily rainfall Data filtering Extreme events Kelvin waves Midlatitudes Northeast Brazil Precipitation anomalies Precipitation events Precipitation variability Rainfall South America Spatial structure Wave train Coastal zones Gravity waves Locomotives Railroad cars Rain atmospheric convection extreme event formation mechanism Kelvin wave precipitation intensity rainfall Brazil The mechanisms resulting in large daily rainfall events in Northeast Brazil are analyzed using data filtering to exclude periods longer than 30 days. Composites of circulation fields that include all independent events do not reveal any obvious forcing mechanisms as multiple patterns contribute to Northeast Brazil precipitation variability. To isolate coherent patterns, subsets of events are selected based on anomalies that precede the Northeast Brazil precipitation events at different locations. The results indicate that at 10°S, 40°W, the area of lowest annual rainfall in Brazil, precipitation occurs mainly in association with trailing midlatitude synoptic wave trains originating in either hemisphere. Closer to the equator at 5°S, 37.5°W, an additional convection precursor is found to the west, with a spatial structure consistent with that of a Kelvin wave. Although these two sites are located within only several hundred kilometers of each other and the midlatitude patterns that induce precipitation appear to be quite similar, the dates on which large precipitation anomalies occur at each location are almost entirely independent, pointing to separate forcing mechanisms. © 2011 American Meteorological Society. Fil:Vera, C.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08948755_v24_n2_p376_Liebmann http://hdl.handle.net/20.500.12110/paper_08948755_v24_n2_p376_Liebmann
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Extreme events Kelvin waves Rainfall South America Annual rainfall Daily rainfall Data filtering Extreme events Kelvin waves Midlatitudes Northeast Brazil Precipitation anomalies Precipitation events Precipitation variability Rainfall South America Spatial structure Wave train Coastal zones Gravity waves Locomotives Railroad cars Rain atmospheric convection extreme event formation mechanism Kelvin wave precipitation intensity rainfall Brazil
spellingShingle	Extreme events Kelvin waves Rainfall South America Annual rainfall Daily rainfall Data filtering Extreme events Kelvin waves Midlatitudes Northeast Brazil Precipitation anomalies Precipitation events Precipitation variability Rainfall South America Spatial structure Wave train Coastal zones Gravity waves Locomotives Railroad cars Rain atmospheric convection extreme event formation mechanism Kelvin wave precipitation intensity rainfall Brazil Vera, Carolina Susana Mechanisms associated with large daily rainfall events in Northeast Brazil
topic_facet	Extreme events Kelvin waves Rainfall South America Annual rainfall Daily rainfall Data filtering Extreme events Kelvin waves Midlatitudes Northeast Brazil Precipitation anomalies Precipitation events Precipitation variability Rainfall South America Spatial structure Wave train Coastal zones Gravity waves Locomotives Railroad cars Rain atmospheric convection extreme event formation mechanism Kelvin wave precipitation intensity rainfall Brazil
description	The mechanisms resulting in large daily rainfall events in Northeast Brazil are analyzed using data filtering to exclude periods longer than 30 days. Composites of circulation fields that include all independent events do not reveal any obvious forcing mechanisms as multiple patterns contribute to Northeast Brazil precipitation variability. To isolate coherent patterns, subsets of events are selected based on anomalies that precede the Northeast Brazil precipitation events at different locations. The results indicate that at 10°S, 40°W, the area of lowest annual rainfall in Brazil, precipitation occurs mainly in association with trailing midlatitude synoptic wave trains originating in either hemisphere. Closer to the equator at 5°S, 37.5°W, an additional convection precursor is found to the west, with a spatial structure consistent with that of a Kelvin wave. Although these two sites are located within only several hundred kilometers of each other and the midlatitude patterns that induce precipitation appear to be quite similar, the dates on which large precipitation anomalies occur at each location are almost entirely independent, pointing to separate forcing mechanisms. © 2011 American Meteorological Society.
author	Vera, Carolina Susana
author_facet	Vera, Carolina Susana
author_sort	Vera, Carolina Susana
title	Mechanisms associated with large daily rainfall events in Northeast Brazil
title_short	Mechanisms associated with large daily rainfall events in Northeast Brazil
title_full	Mechanisms associated with large daily rainfall events in Northeast Brazil
title_fullStr	Mechanisms associated with large daily rainfall events in Northeast Brazil
title_full_unstemmed	Mechanisms associated with large daily rainfall events in Northeast Brazil
title_sort	mechanisms associated with large daily rainfall events in northeast brazil
publishDate	2011
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08948755_v24_n2_p376_Liebmann http://hdl.handle.net/20.500.12110/paper_08948755_v24_n2_p376_Liebmann
work_keys_str_mv	AT veracarolinasusana mechanismsassociatedwithlargedailyrainfalleventsinnortheastbrazil
_version_	1768545652794458112

Mechanisms associated with large daily rainfall events in Northeast Brazil

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