INVESTIGADORES
PANARELLO Hector Osvaldo
congresos y reuniones científicas
Título:
Stable isotope composition of the Rio de la Plata estuary: an attempt to relate to meteorological variables.
Autor/es:
PANARELLO, H.0.; C DAPEÑA,
Lugar:
Pucón, Chile
Reunión:
Congreso; III South American Sympusium on Isotope Geology; 2001
Institución organizadora:
Universidad de Santiago
Resumen:
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The Río de
la Plata estuary is the collector of a vast drainage basin of about 3.1 x 106km2.
Their major tributaries are the Paraná, Paraguay
and Uruguay
rivers. The main course of the Paraná river starts at the "Planalto do
Brasil", located at the central east Brazil. Pilcomayo and Bermejo
rivers contribute to Paraná water from the high Andes
range. Paraguay river release water coming
from the Mato Grosso. The Uruguay river, directly
and the Iguazú river through the Paraná, also contribute water from braziliam
east coastal hills to theestuary. Less significant are other rivers like the Salado, Negro, etc. The objective of this work is to study the
variations isotopic composition of the Río de la Plata river and its correlation
with the ITCZ , ENSO and other meteorological phenomena. The methodology
consists in the monthly collection of a 2 liter sample in the estuary and the
measurement of 18O and 2H concentration. An aliquot is reserved
for further tritium analysis
In tjis
first repot 40 isotope analysis for the Río de la Plata estuary have been
presented. Cyclical variations of oxygen isotopes, with minima in winter and
maxima in summer has been observed. 2H excess
also change cyclicaly, probably with longer period of time. We are gathering
data for a more detailed and longer record in order to estasblish a fine
correlation of the isotopic composition with the ITCZ seasonality and the ENSO
phenomena.
