Dear Bill,
Perhaps this will be helpful. In the last 7000 years profile, the d13C value of
organic matter in Gotland sediments vary from to -28.9 to –25.9 ‰. The d13C and
d18OPDB values in carbonate (rhodochrosite) in the same sediments vary from
-8.4 to –6.5 ‰ and from –3.4 to –1.1 ‰, respectively. If you need - more data
you can find at:
Jedrysek M.O., Skrzypek G., Halas S., Kral T., Pazdur A., Wada E., Takai Y.,
Vijarnsorn P., Doroszko B., Kaluzny A., Weber-Weller A., and Wójcik A., 1999,
Seawater/freshwater records in stable isotope composition of sediments: marine
muds from Baltic’s Gotland deep and mangrove peat profile from Thailand.,
Quaternary Studies in Poland., Special Issue-1999, 127-133.

Mariusz
___________________________________
"William P. Patterson" wrote:

> Dear Isogeochemists,
> I'm currently collaborating on a project investigating the life history of
> Iron age Cod from the Baltic Sea (Gotland). Water temperatures calculated
> from d18O values of cod otoliths (using modern cod thermal tolerance)
> suggest a rather low d18O value for the Baltic Sea during the Iron age
> (-5”VSMOW).
>
> Two questions....
> Has anyone attempted to calculate the Baltic Sea water values for the Iron
> age?
> Are there any studies which have determined the isotope value of the modern
> Baltic Sea (DIC and/or d18O)?
>
> Thanks,
> Bill
>
> William P. Patterson
> Syracuse University
> Department of Earth Sciences
> Syracuse, NY 13244-1070
>
> Phone:  315-443-3869
> FAX:    315-443-3363
> URL:    http://128.230.24.91/bill.html