Sources of precipitation over South-Eastern Spain and groundwater recharge. An isotopic study

J. Cruz-San Julian; L. Araguas; K. Rozanski; J. Benavente; J. Cardenal; M. C. Hidalgo; S. Garcia-Lopez; J. C. Martinez-Garrido; F. Moral; M. Olias

doi:10.3402/tellusb.v44i3.15445

Sources of precipitation over South-Eastern Spain and groundwater recharge. An isotopic study

Tellus B: Chemical and Physical Meteorology

Volume 44 (1992): Issue 3

By: J. Cruz-San Julian, L. Araguas, K. Rozanski, J. Benavente, J. Cardenal, M. C. Hidalgo, S. Garcia-Lopez, J. C. Martinez-Garrido, F. Moral and M. Olias

Open Access

|Jan 1992

Abstract

The deuterium and oxygen-18 compositions were monitored in several single rain events in south-eastern Spain from November 1989 till April 1990. Large variations in both δD and δ¹⁸O, as well as in the value of deuterium excess (d-value) of up to + 27‰, were recorded during this time period. The observed variations are clearly related to different source regions of the vapour (Atlantic Ocean or Mediterranean Sea) as well as to different trajectories of precipitating air masses. Whereas the rains of Atlantic origin were characterized by d-values close to + 10‰, the Mediterranean-derived precipitation showed much higher values, of up to + 27‰. The apparent correlation between altitude of the sampling site and the d-value of the corresponding rain can be attributed to two mechanisms: the evaporative isotopic enrichment of rain drops below the clouds, especially at initial stages of the given precipitation event, and/or precipitation from air masses with different isotopic signature (d-value) of the water vapour. The range of the d-values observed in samples from local springs and wells (between + 10 and + 13‰) suggests that groundwater in the studied areas is recharged predominantly by the Atlantic-derived precipitation.

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Articles in this issue

DOI: https://doi.org/10.3402/tellusb.v44i3.15445 | Journal eISSN: 1600-0889

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Language: English

Page range: 226 - 236

Submitted on: Sep 18, 1991

Accepted on: Feb 3, 1992

Published on: Jan 1, 1992

Published by: Stockholm University Press

In partnership with: Paradigm Publishing Services

© 1992 J. Cruz-San Julian, L. Araguas, K. Rozanski, J. Benavente, J. Cardenal, M. C. Hidalgo, S. Garcia-Lopez, J. C. Martinez-Garrido, F. Moral, M. Olias, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 44 (1992): Issue 3