Low-frequency oscillations in climatic and hydrological variables in southern South America’s tropical-subtropical regions |
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| Authors: | W M Vargas J L Minetti A G Poblete |
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| Institution: | (1) Departmento de Ciencias de la Atmósfera y los Océanos, Universidad de Buenos Aires/CONICET,Buenos Aires, Argentina, AR;(2) CONICET/Fundación Carl C:Zon Caldenius (NOAA)Padre Roque Correa Tucumán, Argentina, AR;(3) Departmento de Geografia-Universidad Nacional de San Juan, Prov. de San Juan, Argentina, AR |
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| Abstract: | Summary The existence of low-frequency variability in climatic-hydrological-oceanic variables may be useful for long-term forecasting
and climate modelling. By using long time series this paper attempts to identify large-scale quasi-cycles in the precipitation
regimes of Northern Argentina, moisture advection from the Atlantic Ocean and the streamflow of the Paraná River. This work
also shows the presence of coherent waves with long periodicity between the three series. As the three variables are estimated
over different time intervals, the presence of waves in each variable is studied separately, to show they respond to the same
process. The three variables show significant interdecadal variability at low frequency (22–26 years), which might be related
to the ENSO cycle modulation and to the intensification or weakening of the South American Low Level Jet (SALLJ) and South
Atlantic Convergence Zone (SACZ). |
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