Are southern South American Rivers linked to the solar variability?

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This article explores the Sun's influence on the hydrological cycle in southern South America (SSA) at the range of interannual-to-multidecadal scales from the early 1900s to 2011. The solar variability is described by the sunspot number (SSN) index. The hydrological cycle is examined by using...

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Autores principales:	Compagnucci, R.H., Berman, A.L., Velasco Herrera, V., Silvestri, G.
Formato:	JOUR
Materias:	11-year solar cycle Atuel River discharge Hydrological cycle Paraná River discharge Southern South America Subtropical Argentinean Andean Rivers Sunspot numbers Wavelets transform Climatology Solar energy Tropics Hydrological cycles River discharge Southern south america Sunspot number Rivers El Nino-Southern Oscillation hydrological cycle intertropical convergence zone irradiance periodicity river discharge solar cycle solar radiation sunspot transform Argentina Atuel River Parana River
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_08998418_v34_n5_p1706_Compagnucci
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_08998418_v34_n5_p1706_Compagnucci2023-10-03T15:44:22Z Are southern South American Rivers linked to the solar variability? Compagnucci, R.H. Berman, A.L. Velasco Herrera, V. Silvestri, G. 11-year solar cycle Atuel River discharge Hydrological cycle Paraná River discharge Southern South America Subtropical Argentinean Andean Rivers Sunspot numbers Wavelets transform Climatology Solar energy Tropics 11-year solar cycle Hydrological cycles River discharge Southern south america Sunspot number Wavelets transform Rivers El Nino-Southern Oscillation hydrological cycle intertropical convergence zone irradiance periodicity river discharge solar cycle solar radiation sunspot transform Argentina Atuel River Parana River This article explores the Sun's influence on the hydrological cycle in southern South America (SSA) at the range of interannual-to-multidecadal scales from the early 1900s to 2011. The solar variability is described by the sunspot number (SSN) index. The hydrological cycle is examined by using annual mean discharges of the Paraná River (PAR) and the Atuel River (ATU) that represents the behaviour of the subtropical Argentinean Andean hydrological system. Wavelet-based methods are used in order to describe relationships in the entire time-frequency domain. The SSN-PAR connection is statistically weak in oscillations with period about 11years (the Schwabe's solar cycle). Therefore, the solar forcing at this scale must be considered with great caution. The periodicity about 30years is highly significant throughout the analysed period. Two potential physical mechanisms affecting the Paraná discharge could be involved: one is the solar irradiance influence on the Inter Tropical Convergence Zone (ITCZ), and the other is the solar influence on the Pacific long-term variability. The SSN-ATU connection shows by far the most striking, robust and convincing result for the Schwabe cycle. A large amplitude and statistically significant cycle with a period about 11years is observed not only in the Morlet-based global and local wavelet spectra of the Atuel discharges and SSN but also in the global and local spectra of Cross and Coherent wavelets in most of the analysed period. High (low) discharges occur following maxima (minima) of the Schwabe cycles with time lags of up to ~2years. Previous studies have shown a close relationship between the subtropical Argentinean Andean Rivers and the El Niño/Southern Oscillation (ENSO), as well as a solar influence on the ENSO variability. We suggest that El Niño events occurring a few years after solar maxima could explain the connection. Periodicities longer than 30years are suggested. © 2013 Royal Meteorological Society. Fil:Compagnucci, R.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Berman, A.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Silvestri, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08998418_v34_n5_p1706_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	11-year solar cycle Atuel River discharge Hydrological cycle Paraná River discharge Southern South America Subtropical Argentinean Andean Rivers Sunspot numbers Wavelets transform Climatology Solar energy Tropics 11-year solar cycle Hydrological cycles River discharge Southern south america Sunspot number Wavelets transform Rivers El Nino-Southern Oscillation hydrological cycle intertropical convergence zone irradiance periodicity river discharge solar cycle solar radiation sunspot transform Argentina Atuel River Parana River
spellingShingle	11-year solar cycle Atuel River discharge Hydrological cycle Paraná River discharge Southern South America Subtropical Argentinean Andean Rivers Sunspot numbers Wavelets transform Climatology Solar energy Tropics 11-year solar cycle Hydrological cycles River discharge Southern south america Sunspot number Wavelets transform Rivers El Nino-Southern Oscillation hydrological cycle intertropical convergence zone irradiance periodicity river discharge solar cycle solar radiation sunspot transform Argentina Atuel River Parana River Compagnucci, R.H. Berman, A.L. Velasco Herrera, V. Silvestri, G. Are southern South American Rivers linked to the solar variability?
topic_facet	11-year solar cycle Atuel River discharge Hydrological cycle Paraná River discharge Southern South America Subtropical Argentinean Andean Rivers Sunspot numbers Wavelets transform Climatology Solar energy Tropics 11-year solar cycle Hydrological cycles River discharge Southern south america Sunspot number Wavelets transform Rivers El Nino-Southern Oscillation hydrological cycle intertropical convergence zone irradiance periodicity river discharge solar cycle solar radiation sunspot transform Argentina Atuel River Parana River
description	This article explores the Sun's influence on the hydrological cycle in southern South America (SSA) at the range of interannual-to-multidecadal scales from the early 1900s to 2011. The solar variability is described by the sunspot number (SSN) index. The hydrological cycle is examined by using annual mean discharges of the Paraná River (PAR) and the Atuel River (ATU) that represents the behaviour of the subtropical Argentinean Andean hydrological system. Wavelet-based methods are used in order to describe relationships in the entire time-frequency domain. The SSN-PAR connection is statistically weak in oscillations with period about 11years (the Schwabe's solar cycle). Therefore, the solar forcing at this scale must be considered with great caution. The periodicity about 30years is highly significant throughout the analysed period. Two potential physical mechanisms affecting the Paraná discharge could be involved: one is the solar irradiance influence on the Inter Tropical Convergence Zone (ITCZ), and the other is the solar influence on the Pacific long-term variability. The SSN-ATU connection shows by far the most striking, robust and convincing result for the Schwabe cycle. A large amplitude and statistically significant cycle with a period about 11years is observed not only in the Morlet-based global and local wavelet spectra of the Atuel discharges and SSN but also in the global and local spectra of Cross and Coherent wavelets in most of the analysed period. High (low) discharges occur following maxima (minima) of the Schwabe cycles with time lags of up to ~2years. Previous studies have shown a close relationship between the subtropical Argentinean Andean Rivers and the El Niño/Southern Oscillation (ENSO), as well as a solar influence on the ENSO variability. We suggest that El Niño events occurring a few years after solar maxima could explain the connection. Periodicities longer than 30years are suggested. © 2013 Royal Meteorological Society.
format	JOUR
author	Compagnucci, R.H. Berman, A.L. Velasco Herrera, V. Silvestri, G.
author_facet	Compagnucci, R.H. Berman, A.L. Velasco Herrera, V. Silvestri, G.
author_sort	Compagnucci, R.H.
title	Are southern South American Rivers linked to the solar variability?
title_short	Are southern South American Rivers linked to the solar variability?
title_full	Are southern South American Rivers linked to the solar variability?
title_fullStr	Are southern South American Rivers linked to the solar variability?
title_full_unstemmed	Are southern South American Rivers linked to the solar variability?
title_sort	are southern south american rivers linked to the solar variability?
url	http://hdl.handle.net/20.500.12110/paper_08998418_v34_n5_p1706_Compagnucci
work_keys_str_mv	AT compagnuccirh aresouthernsouthamericanriverslinkedtothesolarvariability AT bermanal aresouthernsouthamericanriverslinkedtothesolarvariability AT velascoherrerav aresouthernsouthamericanriverslinkedtothesolarvariability AT silvestrig aresouthernsouthamericanriverslinkedtothesolarvariability
_version_	1782026263616028672

Are southern South American Rivers linked to the solar variability?

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