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Journal of Environmental Hydrology
ISSN 1058-3912 |
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Electronic Journal of the International Association for
Environmental Hydrology
JEH Volume 17 (2009), Paper 20 Posted September 20, 2009 OXYGEN AND HYDROGEN STABLE ISOTOPE MAPS FOR METEORIC GROUNDWATER IN COSTA RICA, EXCLUDING GEOTHERMAL WATERS
Erik B.Melchiorre1 2Water Resources Institute and College of Natural Sciences, California State University, San Bernardino, CA 92407, USA 3Consultant, Lajas, Puerto Rico, USA ABSTRACT We present a set of maps showing the distribution of oxygen and hydrogen isotope values, relative to the VSMOW standard, for the nation of Costa Rica. These maps utilize data from this study (51 new data points; 21 wells, 16 rivers, 14 springs) and data from previous workers (51 data points for rivers, Lachniet and Patterson, 2002; 13 data points for springs, Darling et al., 1989). Computer generated spherical kriging with a 12-point variable was used to produce interpolated isotope contours for each map. An altitude effect of 1.5 to 3 per mil was observed locally, with a superimposed decrease in δ18O with decreasing latitude for low elevation locations. Additional work along the northern border with Nicaragua, in the northern Nicoya Peninsula, and the southern Cordillera de Talamanca will be required to produce a more complete map. Potential collaborators wishing to provide samples or data from these areas should contact the authors. This map will be updated as new data is added, and posted on the internet at http://wri.csusb.edu/. Reference: Melchiorre, E., B.C. Talyn, and K. Pregger. 2009. Oxygen and hydrogen stable isotope maps for meteoric groundwater in Costa Rica, excluding geothermal waters. Journal of Environmental Hydrology, Vol. 17, Paper 20. CONTACT: Erik B. Melchiorre Water Resources Institute and Department of Geology California State University 5500 University Parkway San Bernardino, CA 92407 USA E-mail: emelch@csusb.edu |
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