PERSONAL DE APOYO
DAPEÑA Cristina
congresos y reuniones científicas
Título:
Stable Isotope composition of the Río de La Plata estuary. An attempt to relate to meteorological variables
Autor/es:
PANARELLO, HECTOR; DAPEÑA, CRISTINA
Lugar:
Pucón, Chile
Reunión:
Simposio; III South American Symposium on Isotope Geology; 2001
Institución organizadora:
Sociedad Geologica Chilena y Comité SSAGI Chile
Resumen:
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 the estuary. 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 methodoly 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.