Energetics of wave propagation leading to cold event in tropical latitudes of South America
This paper presents a new vision on the cold and cool events that affect the tropical region of South America, considering the dynamics and the energetics of wave train propagation associated with these systems. Through a composite analysis of meridional winds at 300 hPa for cold (T < 0 °C) and c...
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ftconicet:oai:ri.conicet.gov.ar:11336/37314 2023-10-09T21:55:56+02:00 Energetics of wave propagation leading to cold event in tropical latitudes of South America Muller, Gabriela Viviana Gan, Manoel Alonso Piva, Everson Dal Silveira, Virginia Piccinini application/pdf http://hdl.handle.net/11336/37314 eng eng Springer info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-015-2532-2 info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00382-015-2532-2 http://hdl.handle.net/11336/37314 Muller, Gabriela Viviana; Gan, Manoel Alonso; Piva, Everson Dal; Silveira, Virginia Piccinini; Energetics of wave propagation leading to cold event in tropical latitudes of South America; Springer; Climate Dynamics; 45; 1-2; 7-2015; 1-20 0930-7575 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Energetics Frost Events South America Wave Propagation https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1007/s00382-015-2532-2 2023-09-24T19:07:51Z This paper presents a new vision on the cold and cool events that affect the tropical region of South America, considering the dynamics and the energetics of wave train propagation associated with these systems. Through a composite analysis of meridional winds at 300 hPa for cold (T < 0 °C) and cool (0 °C ≤ T ≤ 2.5 °C) air incursions affecting tropical latitudes and causing frost are studied. The cold events observed in tropical latitudes are associated with a single Rossby wave pattern propagating over the Pacific Ocean which drives the low level anticyclone from the southwest of the continent to low latitudes. This propagation involves a southern circulation due to the meridional wind penetration and consequently cold air advection causing temperatures to drop below 0 °C. During cool events a subtropical wave train propagating through the Pacific Ocean is observed, which merges before the event with a wave coming from the subpolar latitudes of the South Atlantic Ocean. The zonal propagation leads to the entrance of the anticyclone from the west of the continent, and it is strengthened together with the meridionaly extended cyclone located upstream. This configuration causes southerly wind advection over central-southeastern Brazil and consequently causes the temperature decrease. The energetics shows that the cold events kinetic energy maxima are more intense than those of cool events. For the cold events three maxima are observed, the first (K1) and the third (K3) maxima are developed by baroclinic conversion and ageostrophic flux convergence and the second one (K2) by ageostrophic flux convergence. For the cool events two maxima are found, the first maximum (K4) developed by baroclinic conversion and the second one by ageostrophic flux convergence. Fil: Muller, Gabriela Viviana. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la ... Article in Journal/Newspaper South Atlantic Ocean CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Entre Ríos ENVELOPE(-66.333,-66.333,-66.433,-66.433) Pacific Climate Dynamics 45 1-2 1 20 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Energetics Frost Events South America Wave Propagation https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
Energetics Frost Events South America Wave Propagation https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Muller, Gabriela Viviana Gan, Manoel Alonso Piva, Everson Dal Silveira, Virginia Piccinini Energetics of wave propagation leading to cold event in tropical latitudes of South America |
topic_facet |
Energetics Frost Events South America Wave Propagation https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
This paper presents a new vision on the cold and cool events that affect the tropical region of South America, considering the dynamics and the energetics of wave train propagation associated with these systems. Through a composite analysis of meridional winds at 300 hPa for cold (T < 0 °C) and cool (0 °C ≤ T ≤ 2.5 °C) air incursions affecting tropical latitudes and causing frost are studied. The cold events observed in tropical latitudes are associated with a single Rossby wave pattern propagating over the Pacific Ocean which drives the low level anticyclone from the southwest of the continent to low latitudes. This propagation involves a southern circulation due to the meridional wind penetration and consequently cold air advection causing temperatures to drop below 0 °C. During cool events a subtropical wave train propagating through the Pacific Ocean is observed, which merges before the event with a wave coming from the subpolar latitudes of the South Atlantic Ocean. The zonal propagation leads to the entrance of the anticyclone from the west of the continent, and it is strengthened together with the meridionaly extended cyclone located upstream. This configuration causes southerly wind advection over central-southeastern Brazil and consequently causes the temperature decrease. The energetics shows that the cold events kinetic energy maxima are more intense than those of cool events. For the cold events three maxima are observed, the first (K1) and the third (K3) maxima are developed by baroclinic conversion and ageostrophic flux convergence and the second one (K2) by ageostrophic flux convergence. For the cool events two maxima are found, the first maximum (K4) developed by baroclinic conversion and the second one by ageostrophic flux convergence. Fil: Muller, Gabriela Viviana. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la ... |
format |
Article in Journal/Newspaper |
author |
Muller, Gabriela Viviana Gan, Manoel Alonso Piva, Everson Dal Silveira, Virginia Piccinini |
author_facet |
Muller, Gabriela Viviana Gan, Manoel Alonso Piva, Everson Dal Silveira, Virginia Piccinini |
author_sort |
Muller, Gabriela Viviana |
title |
Energetics of wave propagation leading to cold event in tropical latitudes of South America |
title_short |
Energetics of wave propagation leading to cold event in tropical latitudes of South America |
title_full |
Energetics of wave propagation leading to cold event in tropical latitudes of South America |
title_fullStr |
Energetics of wave propagation leading to cold event in tropical latitudes of South America |
title_full_unstemmed |
Energetics of wave propagation leading to cold event in tropical latitudes of South America |
title_sort |
energetics of wave propagation leading to cold event in tropical latitudes of south america |
publisher |
Springer |
url |
http://hdl.handle.net/11336/37314 |
long_lat |
ENVELOPE(-66.333,-66.333,-66.433,-66.433) |
geographic |
Entre Ríos Pacific |
geographic_facet |
Entre Ríos Pacific |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-015-2532-2 info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00382-015-2532-2 http://hdl.handle.net/11336/37314 Muller, Gabriela Viviana; Gan, Manoel Alonso; Piva, Everson Dal; Silveira, Virginia Piccinini; Energetics of wave propagation leading to cold event in tropical latitudes of South America; Springer; Climate Dynamics; 45; 1-2; 7-2015; 1-20 0930-7575 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1007/s00382-015-2532-2 |
container_title |
Climate Dynamics |
container_volume |
45 |
container_issue |
1-2 |
container_start_page |
1 |
op_container_end_page |
20 |
_version_ |
1779320198945308672 |