22-27 September 2019
Trade Fairs and Congress Center (FYCMA)
Europe/Madrid timezone

Drivers of rainfall isotope composition in the northern Chilean Central Andes

23 Sep 2019, 16:00
1h
Trade Fairs and Congress Center (FYCMA)

Trade Fairs and Congress Center (FYCMA)

Av. de José Ortega y Gasset, 201 29006 Malaga, Spain
Poster Topic 3 - Groundwater sustainability and governance Poster with refreshments

Speaker

Ms Sonia Valdivielso (Institute of Environmental Assessment and Water Research (IDEA/CSIC))

Description

The Central Andes is a geographical barrier that exceeds the elevation of 5000 m a.s.l. The Central Andes is constituted by two mountain ranges: the Eastern Cordillera and the Western Cordillera. Between them, the Central Andres plateau is well known for its fresh and salty lakes and its salt flats. During the austral summer, the strong easterly winds bring moisture from the Atlantic Ocean to the Central Andes. In the Eastern Cordillera (i.e. Bolivia) the strong continental and altitude effect component on the rainfall isotopic composition suggests the high influence of moisture sources from the Atlantic Ocean in the Eastern Cordillera during the austral summer.
The Pacific Ocean is considered a secondary and limited source of moisture to the Western Cordillera. During the austral winter, the Western Cordillera and the high plateau receives from the Pacific Ocean a precipitation less than 20% of annual precipitation. The limited rainfall isotope data and isotope mapping studies from northern Chilean translates into difficulties in the interpretation of changes in moisture sources. Despite this, we hypothesise that the northern Chilean Central Andes (latitudes 18° S to 24,6° S; elevation >3000 m a.s.l.) rainfall is enriched in heavy isotopes towards higher latitudes.

Primary author

Ms Sonia Valdivielso (Institute of Environmental Assessment and Water Research (IDEA/CSIC))

Co-authors

Dr Enric Vàzquez-Suñé (Institute of Environmental Assessment and Water Research (IDEA/CSIC)) Emilio Custodio (Technical University of Catalonia)

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