Hi Bill, you were looking for Baltic Sea isotope samples. Brian Fry and I analysed some DIC samples from the Baltic Proper in summer 98 for their 13C values. We found numbers of 2 permill at the surface decreasing to -2 permill in 70 m depth. Below that, i.e. below the permanent halocile, we found some variation between -3 and -2 permill down to the bottom. Those data are not yet published. Hope it helps Cheers Maren Maren Voss Baltic Sea Research Institute Seestr. 15 18119 Warnemuende Germany [log in to unmask]