ESTACIÓN SANTA FE. RED NACIONAL DE COLECTORES. ARGENTINA

DAPEÑA, C.; PANARELLO, H.O.

Paraná

Congreso; V CONGRESO ARGENTINO DE HIDROGEOLOGIA; 2007

IAH Universidad Nacional de Entre Ríos

The isotope composition of precipitation is a characteristic of a given region. It is generallydetermined by meteorological local parameters like temperature, relative humidity and rainamount. Precipitation represents one of the most important factors of recharge. The measurement and record of the isotope content of the precipitation of Argentina are beingmade by the stations of the National Network of Collectors. It was created by the InstitutodeGeocronología y Geología Isotópica (INGEIS) within the framework of the Global for NetworkIsotopes in Precipitation (GNIP). In this work we present the results obtained in Ushuaiaduring the period 1982-2003. We analyzed the isotopic composition (2H, 18O) and its relationwith the meteorological parameters (temperature and amount of precipitation) in a record of 22 years. This station is located in the mentioned city, in Tierra del Fuego, Antártida e Islasdel Atlántico Sur province at 54º 47´ S and 68º 17´W, 10m above the sea level. It is operated by the Centro Austral de Investigaciones Científicas (CADIC) of the Consejo Nacional deInvestigaciones Científicas y Técnicas (CONICET). It was installed by initiative of the INGEISand the CADIC and began to work in October, 1981. The weighted average of theprecipitation corresponds to d18O = -11.1 and d2H = -84 and deuterium excess equal to4 . With these data we have elaborated the local meteoric line for the region, i.e.: d2H =(7.60± 0.19) d18O - (0.69 ± 2.14). A large precipitation record at Ushuaia station as well as inothers localities of Argentina is a fundamental objective to bring scientific tools forenvironmental isotope studies.KeyWords: Isotope composition, precipitation, Ushuaia, temperature, Argentina.