Isotopic composition of precipitation and groundwater in Sicily,Italy |
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| Institution: | 1. Division of Earth and Ocean Sciences, Nicholas School of Environment, Duke University, Durham, NC 27708, USA;2. Istituto di Geoscienze e Georisorse, CNR, Via Moruzzi 1, 56124, Pisa, Italy;3. Dipartimento di Scienze della Terra e dell''Ambiente, Università di Pavia, Via Ferrata 1, 27100 Pavia, Italy;4. School of Geography and the Environment, Oxford University, Oxford OX11 9QA, UK;1. Applied Research Center, Florida International University, 10555 W. Flagler Street, Miami, FL 33174, USA;2. Pacific Northwest National Laboratory, PO Box 999, K3-62, Richland, WA 99352, USA;1. Department of Science and Technology, University of Naples “Parthenope”, Centro Direzionale, Isola C4, 80143 Napoli, Italy;2. Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Caserta, Via Vivaldi, 43, 81100 Caserta, Italy;3. I.N.G.V. (Istituto Nazionale di Geofisica e Vulcanologia), Via di Vigna Murata, 00100 Roma, Italy |
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| Abstract: | The isotopic composition of meteoric water in Sicily, Italy was investigated from May 2004 until June 2006. Samples were sampled monthly from a network of 50 rain gauges. During the same period 580 groundwater samples were collected from springs and wells to obtain insight into the isotopic composition of the water circulating in the main aquifers of the area. The mean weighted precipitation values were used to define the weighted local meteoric water line for five different sectors of Sicily. The use of Geographical Information System tools, coupled with isotopic vertical gradients, allowed designing an isotopic contour map of precipitation in Sicily. The defined meteoric compositions were highly consistent with most of the groundwater samples in each sector. However, in some areas fractionation processes occurring during and after rainfall slightly modify the isotopic composition of the groundwater. The obtained data set defines the present day isotopic composition of meteoric water in the central Mediterranean area and provides baseline values for future climatic and/or isotope-based hydrology studies. |
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