Inter-annual variability of the Cuyo rivers' streamflow in the Argentinean Andean mountains and ENSO events

The main source of the Cuyo rivers' water volume is the melting of winter accumulated snow over the Andes subtropical high mountains. Particularly between 30 and 40°S, Andean winter precipitation (April-September) shows both spatial coherence and significant correlations with the Santiago preci...

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Detalles Bibliográficos
Autores principales: Compagnucci, Rosa Hilda, Vargas, Walter Mario
Publicado: 1998
Materias:
Argentina
Central Andes
Circulation patterns
ENSO
Inter-annual variability
Mendoza river streamflow
Principal component analysis
Winter snowfall
El Nino-Southern Oscillation
hydrology
precipitation (climatology)
streamflow
temporal variation
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v18_n14_p1593_Compagnucci
http://hdl.handle.net/20.500.12110/paper_08998418_v18_n14_p1593_Compagnucci
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_08998418_v18_n14_p1593_Compagnucci
record_format dspace
spelling paper:paper_08998418_v18_n14_p1593_Compagnucci2023-06-08T15:49:34Z Inter-annual variability of the Cuyo rivers' streamflow in the Argentinean Andean mountains and ENSO events Compagnucci, Rosa Hilda Vargas, Walter Mario Argentina Central Andes Circulation patterns ENSO Inter-annual variability Mendoza river streamflow Principal component analysis Winter snowfall El Nino-Southern Oscillation hydrology precipitation (climatology) streamflow temporal variation Argentina The main source of the Cuyo rivers' water volume is the melting of winter accumulated snow over the Andes subtropical high mountains. Particularly between 30 and 40°S, Andean winter precipitation (April-September) shows both spatial coherence and significant correlations with the Santiago precipitation. That is why this zone, which corresponds to the Cuyo rivers' basin areas, is homogeneous with respect to the streamflow's inter-annual variability. The streamflows of the rivers in this region are highly correlated to each other. Therefore, the Mendoza river, which is one of the Cuyo rivers is taken as reference for all these rivers to study the summer streamflow inter-annual variability (October-March) and the association with ENSO events. This river exhibits behaviour associated with equatorial Pacific Ocean anomalies. Above average streamflow is more likely to occur during a mature phase of El Nino event in the southern summer. This implies abundant and frequent snowfalls during the previous winter over the high subtropical Andes. Abundant and frequent snowfalls in the winter after an El Nino year, and the subsequent high flows during the following summer, are less likely to occur. This teleconnectivity is not absolute since some warm events were recorded and simultaneous flows remained below average. Instead, values under the mean flow are more likely during cold event years, with exceptions being quite rare. This atmospheric circulation study involves principal component analysis of daily surface pressure fields from 1972 to 1983. It reveals identifiable characteristics for Andean winters with above average precipitations. Wet winters are charecterized by both less explained variance by the first principal component, whose pattern corresponds to a high zonal flow component, and more explained variance of those patterns matching low pressure systems and cold frontal passages which have a high meridional flow component. The inverse occurs indry winters. Generally, patterns corresponding to post-frontal anticyclones show no significant correlation with the precipitation over the high subtropical Andes. Fil:Compagnucci, R.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vargas, W.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v18_n14_p1593_Compagnucci http://hdl.handle.net/20.500.12110/paper_08998418_v18_n14_p1593_Compagnucci
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
Central Andes
Circulation patterns
ENSO
Inter-annual variability
Mendoza river streamflow
Principal component analysis
Winter snowfall
El Nino-Southern Oscillation
hydrology
precipitation (climatology)
streamflow
temporal variation
Argentina
spellingShingle Argentina
Central Andes
Circulation patterns
ENSO
Inter-annual variability
Mendoza river streamflow
Principal component analysis
Winter snowfall
El Nino-Southern Oscillation
hydrology
precipitation (climatology)
streamflow
temporal variation
Argentina
Compagnucci, Rosa Hilda
Vargas, Walter Mario
Inter-annual variability of the Cuyo rivers' streamflow in the Argentinean Andean mountains and ENSO events
topic_facet Argentina
Central Andes
Circulation patterns
ENSO
Inter-annual variability
Mendoza river streamflow
Principal component analysis
Winter snowfall
El Nino-Southern Oscillation
hydrology
precipitation (climatology)
streamflow
temporal variation
Argentina
description The main source of the Cuyo rivers' water volume is the melting of winter accumulated snow over the Andes subtropical high mountains. Particularly between 30 and 40°S, Andean winter precipitation (April-September) shows both spatial coherence and significant correlations with the Santiago precipitation. That is why this zone, which corresponds to the Cuyo rivers' basin areas, is homogeneous with respect to the streamflow's inter-annual variability. The streamflows of the rivers in this region are highly correlated to each other. Therefore, the Mendoza river, which is one of the Cuyo rivers is taken as reference for all these rivers to study the summer streamflow inter-annual variability (October-March) and the association with ENSO events. This river exhibits behaviour associated with equatorial Pacific Ocean anomalies. Above average streamflow is more likely to occur during a mature phase of El Nino event in the southern summer. This implies abundant and frequent snowfalls during the previous winter over the high subtropical Andes. Abundant and frequent snowfalls in the winter after an El Nino year, and the subsequent high flows during the following summer, are less likely to occur. This teleconnectivity is not absolute since some warm events were recorded and simultaneous flows remained below average. Instead, values under the mean flow are more likely during cold event years, with exceptions being quite rare. This atmospheric circulation study involves principal component analysis of daily surface pressure fields from 1972 to 1983. It reveals identifiable characteristics for Andean winters with above average precipitations. Wet winters are charecterized by both less explained variance by the first principal component, whose pattern corresponds to a high zonal flow component, and more explained variance of those patterns matching low pressure systems and cold frontal passages which have a high meridional flow component. The inverse occurs indry winters. Generally, patterns corresponding to post-frontal anticyclones show no significant correlation with the precipitation over the high subtropical Andes.
author Compagnucci, Rosa Hilda
Vargas, Walter Mario
author_facet Compagnucci, Rosa Hilda
Vargas, Walter Mario
author_sort Compagnucci, Rosa Hilda
title Inter-annual variability of the Cuyo rivers' streamflow in the Argentinean Andean mountains and ENSO events
title_short Inter-annual variability of the Cuyo rivers' streamflow in the Argentinean Andean mountains and ENSO events
title_full Inter-annual variability of the Cuyo rivers' streamflow in the Argentinean Andean mountains and ENSO events
title_fullStr Inter-annual variability of the Cuyo rivers' streamflow in the Argentinean Andean mountains and ENSO events
title_full_unstemmed Inter-annual variability of the Cuyo rivers' streamflow in the Argentinean Andean mountains and ENSO events
title_sort inter-annual variability of the cuyo rivers' streamflow in the argentinean andean mountains and enso events
publishDate 1998
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v18_n14_p1593_Compagnucci
http://hdl.handle.net/20.500.12110/paper_08998418_v18_n14_p1593_Compagnucci
work_keys_str_mv AT compagnuccirosahilda interannualvariabilityofthecuyoriversstreamflowintheargentineanandeanmountainsandensoevents
AT vargaswaltermario interannualvariabilityofthecuyoriversstreamflowintheargentineanandeanmountainsandensoevents
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