2004 Denver Annual Meeting (November 7–10, 2004)

Paper No. 11
Presentation Time: 8:00 AM-12:00 PM


DIETRICH, Kristin A.1, PATTERSON, William P.2, HOLMDEN, Chris1 and DIEFENDORF, Aaron F.2, (1)Department of Geological Sciences, Univ of Saskatchewan, 114 Science Pl, Saskatoon, SK S7N 5E2, Canada, (2)Department of Geological Sciences, Univ of Saskatchewan, 114 Science Pl, Saskatoon, SK S7N 5E2, kad125@mail.usask.ca

We present a study of spatial variation of stable isotope (δ18O and δD) values of surface waters from Iceland. A total of 68 lakes and rivers were sampled during an eight day period in May and June of 2004, and analyzed for δ18O and δD. The water values range in δ18O from –13.6 to –7.6‰ VSMOW and average –9.9‰. δD values range from –100.2 to –53.2‰ and average –70.9‰. The local surface water line calculated from this data is δD=7.90·δ18O + 7.36, with an R2 value of 0.88. This slope is slightly higher than that of the local meteoric water line for this region, δD=7.21·δ18O + 0.75. δ18O values show a decreasing trend from southwest to northeast, and there is a weak correlation between δ18O values and elevation. Modern water isotope values can help to identify the origin and season of precipitation, as well as determine the effects of evaporation, water transport and recycling in a region. This information can better characterize how climate regimes affect surface water values. As well, a more thorough understanding of modern climate systems can aid in the interpretation of paleoclimatic proxy records from a given region. The data presented here provides a picture of modern water isotope variation for this region, that is temporally limited, but offers a basis for understanding local hydrological systems and insight into longer-term climate change.