Origin of modeled air-mass trajectories using the isotope composition of rainwater during the SALLJEX experiment

GONZALEZ, MARCELA; DAPEÑA, CRISTINA; CERNE, BIBIANA; SANCHEZ-CCOYLLO, ODON; FREITAS, SAULO; SILVA DIAS, PEDRO L.; PANARELLO, HECTOR

San Pablo, Brasil

Congreso; XV CBMET - Congresso Brasileiro de Meteorología “A Meteorologia e as cidades”; 2008

SBMET Sociedad Brasileria de Meteorologia

The SALLJEX experiment was held during the summer 2002-2003. It consisted of the three-dimensional observation of the atmosphere to study the structure of the low level jet. Daily precipitation water samples were collected at two stations (Resistencia and Salta) in northern Argentina, and the isotopic content was analyzed. These data were used to verify the trajectories obtained from a 3-D kinematic model (3D-MTC) developed by the University of Sao Paulo, Brazil. Values of deuterium excess were related with air masses of continental origin, whilst low values were associated with air masses with longer oceanic trajectories Furthermore, although data are scarce, results show that oxygen-18 and deuterium excess in rainwater are related with the occurrence of the low level jet. The results reinforce the need of daily measurements of precipitation isotopic content in Argentina