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Authors: Madonia, P.*
Federico, C.*
Favara, R.*
Title: Isotopic composition of rain- and groundwater at Mt. Vesuvius: environmental and volcanological implications
Title of journal: Environmental Earth Sciences
Series/Report no.: /72(2014)
Publisher: Springer Berlin Heidelberg
Issue Date: Sep-2014
DOI: 10.1007/s12665-014-3110-3
Keywords: Groundwater
Orographic cloud
Oxygen isotopic composition
Abstract: The present work reports on the isotopic characterization of rainfall and groundwater at Mt. Vesuvius. Values of d18O, monthly measured on rain samples collected during the period 2002–2004 in a rain-gauge network composed of 10 stations, were compared with meteorological and DEM data. Air temperature, controlled by the local orographic structure, was identified as the main factor influencing rain isotopic composition. Another important role is played by orographic clouds, whose condensation over the top of Mt. Vesuvius is responsible for anomalously high d18O values recorded in rain samples from the summit area of the volcanic edifice. A spatial model of rain isotopic composition, based on a 3D distribution of temperature derived by a 1 9 1 km DEM, was implemented and used for calculating the theoretical isotopic signature of seepage, further compared with data measured in the groundwater monitoring network. The analysis evidenced the role of local meteoric recharge as the main source feeding Mt. Vesuvius aquifers. The unique exception is the Olivella drainage gallery, located on the north-eastern flank of the volcanic edifice, whose isotopic composition is slightly more positive than the one expected for its altitude, likely caused by both evaporation processes and mixing with condensed hydrothermal vapor.
Appears in Collections:03.04.07. Radioactivity and isotopes
Papers Published / Papers in press

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