IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
artículos
Título:
Atmospheric constraints on δ 18 O and d -excess in precipitation at the middle latitude in the southwestern Atlantic region
Autor/es:
MAENZA, REINALDO; MARTÍNEZ, DANIEL E.; QUIROZ LONDOÑO, ORLANDO MAURICIO
Revista:
ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES
Editorial:
TAYLOR & FRANCIS LTD
Referencias:
Año: 2020 vol. 56 p. 551 - 565
ISSN:
1025-6016
Resumen:
The mid-latitude coastal area at the western South-Atlantic out of the tropics is under the combined e ff ect of di ff erent atmospheric circulation patterns at di ff erent temporal scales, which can be shown by the isotope composition of precipitation. This pattern e ff ect is more changing and complex than that for the well-studied tropical areas, the isotope studies being an interesting proxy for dentifying major processes. This study is focused on the isotope composition of precipitation at a mid-latitude zone, in the western South-Atlantic coastal area of Argentina. δ18O and d-excess were analysed in a data series of 14 years, obtained from the integration of three neighbouring rain collectors at 38°S. A seasonality is observed in both parameters, but with some di ff erences in the extreme months. δ18O showed a seasonality according to the temperature e ff ect, but with a displacement of high values to spring months. Signi fi cant linear links between δ18O and Southern Annular Mode (SAM) index and Southern Oscillation Index (SOI) were recognised for the summer and spring seasons, respectively.