Journal of Environmental Hydrology
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
2Water Resources Institute and College of Natural Sciences, California State University, San Bernardino, CA 92407, USA
3Consultant, Lajas, Puerto Rico, USA
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.
Erik B. Melchiorre
Water Resources Institute and Department of Geology
California State University
5500 University Parkway
San Bernardino, CA 92407
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