Cold and warm events over Argentina and their relationship with the ENSO phases: Risk evaluation analysis

The main purpose of this work is to provide a broad assessment of the influence of the El Nino-southern oscillation (ENSO) on the frequency of extreme temperature events throughout the year in Argentina. The cold and warm events, defined by the persistence of significant anomalies arising from the m...

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Detalles Bibliográficos
Autores principales: Rusticucci, M., Vargas, W.
Formato: JOUR
Materias:
Argentina
Cold events
ENSO
Temperature extremes
Warm events
Atmospheric temperature
Climate change
Oscillations
Risk assessment
Climatology
air-sea interaction
El Nino-Southern Oscillation
extreme event
temperature anomaly
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08998418_v22_n4_p467_Rusticucci
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_08998418_v22_n4_p467_Rusticucci
record_format dspace
spelling todo:paper_08998418_v22_n4_p467_Rusticucci2023-10-03T15:44:13Z Cold and warm events over Argentina and their relationship with the ENSO phases: Risk evaluation analysis Rusticucci, M. Vargas, W. Argentina Cold events ENSO Temperature extremes Warm events Atmospheric temperature Climate change Oscillations Risk assessment Cold events Climatology air-sea interaction El Nino-Southern Oscillation extreme event temperature anomaly Argentina The main purpose of this work is to provide a broad assessment of the influence of the El Nino-southern oscillation (ENSO) on the frequency of extreme temperature events throughout the year in Argentina. The cold and warm events, defined by the persistence of significant anomalies arising from the maximum and minimum temperatures, are more intense in the subtropical latitudes, north of Argentina (northeast for cold events and northwest for warm events), during the coldest months, and in the south (higher latitudes) in the warmest months. The persistence of the air masses is always greater in the north. The warm (cold) events have a preferential region of dissipation in the northwest (northeast) of Argentina, close to the Andes. The effect of the ENSO phases on the probability of occurrences of these events has a large inter-monthly variability. The different La Nin̄a episodes are more homogeneous in relation to their effects and feasibility for the prediction of extreme temperatures within the region, especially for cold events. During La Nin̄a episodes, all 2 month periods (except August-September) present a higher occurrence probability of very persistent and intense cold events, compared with Neutral months in different regions of the country. Conversely, the different El Nin̄o episodes are more heterogeneous and, therefore, thier effects on temperature are more varied and so less predictable. However, El Nin̄o episodes exhibit a stronger signal, which is associated with the tropical air incursions that generate extreme warm events, particularly in winter. These events have a higher occurrence probability in the north and a lower one in the south during the months of June to November. Cold events have a lower occurrence probability in different regions, during the El Nin̄o phase, in the period April to September. In some cases, the ENSO signal is stronger in daily temperature values than in monthly ones over Argentina. Copyright © 2002 Royal Meteorological Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08998418_v22_n4_p467_Rusticucci
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Cold events
ENSO
Temperature extremes
Warm events
Atmospheric temperature
Climate change
Oscillations
Risk assessment
Cold events
Climatology
air-sea interaction
El Nino-Southern Oscillation
extreme event
temperature anomaly
Argentina
spellingShingle Argentina
Cold events
ENSO
Temperature extremes
Warm events
Atmospheric temperature
Climate change
Oscillations
Risk assessment
Cold events
Climatology
air-sea interaction
El Nino-Southern Oscillation
extreme event
temperature anomaly
Argentina
Rusticucci, M.
Vargas, W.
Cold and warm events over Argentina and their relationship with the ENSO phases: Risk evaluation analysis
topic_facet Argentina
Cold events
ENSO
Temperature extremes
Warm events
Atmospheric temperature
Climate change
Oscillations
Risk assessment
Cold events
Climatology
air-sea interaction
El Nino-Southern Oscillation
extreme event
temperature anomaly
Argentina
description The main purpose of this work is to provide a broad assessment of the influence of the El Nino-southern oscillation (ENSO) on the frequency of extreme temperature events throughout the year in Argentina. The cold and warm events, defined by the persistence of significant anomalies arising from the maximum and minimum temperatures, are more intense in the subtropical latitudes, north of Argentina (northeast for cold events and northwest for warm events), during the coldest months, and in the south (higher latitudes) in the warmest months. The persistence of the air masses is always greater in the north. The warm (cold) events have a preferential region of dissipation in the northwest (northeast) of Argentina, close to the Andes. The effect of the ENSO phases on the probability of occurrences of these events has a large inter-monthly variability. The different La Nin̄a episodes are more homogeneous in relation to their effects and feasibility for the prediction of extreme temperatures within the region, especially for cold events. During La Nin̄a episodes, all 2 month periods (except August-September) present a higher occurrence probability of very persistent and intense cold events, compared with Neutral months in different regions of the country. Conversely, the different El Nin̄o episodes are more heterogeneous and, therefore, thier effects on temperature are more varied and so less predictable. However, El Nin̄o episodes exhibit a stronger signal, which is associated with the tropical air incursions that generate extreme warm events, particularly in winter. These events have a higher occurrence probability in the north and a lower one in the south during the months of June to November. Cold events have a lower occurrence probability in different regions, during the El Nin̄o phase, in the period April to September. In some cases, the ENSO signal is stronger in daily temperature values than in monthly ones over Argentina. Copyright © 2002 Royal Meteorological Society.
format JOUR
author Rusticucci, M.
Vargas, W.
author_facet Rusticucci, M.
Vargas, W.
author_sort Rusticucci, M.
title Cold and warm events over Argentina and their relationship with the ENSO phases: Risk evaluation analysis
title_short Cold and warm events over Argentina and their relationship with the ENSO phases: Risk evaluation analysis
title_full Cold and warm events over Argentina and their relationship with the ENSO phases: Risk evaluation analysis
title_fullStr Cold and warm events over Argentina and their relationship with the ENSO phases: Risk evaluation analysis
title_full_unstemmed Cold and warm events over Argentina and their relationship with the ENSO phases: Risk evaluation analysis
title_sort cold and warm events over argentina and their relationship with the enso phases: risk evaluation analysis
url http://hdl.handle.net/20.500.12110/paper_08998418_v22_n4_p467_Rusticucci
work_keys_str_mv AT rusticuccim coldandwarmeventsoverargentinaandtheirrelationshipwiththeensophasesriskevaluationanalysis
AT vargasw coldandwarmeventsoverargentinaandtheirrelationshipwiththeensophasesriskevaluationanalysis
_version_ 1807323064035180544

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