Dear David,

You may also be interested in looking at the NOAA Carbon Cycle Group web
page at:

http://www.cmdl.noaa.gov/ccg/

Check out the figures page to find ppm values of CO2 and  d 13C in CO2 at
over 40 global sites, inlcuding Barrow Alaska and South Pole, etc.

Good luck,

Bruce
_________________________________________________________
        Bruce H. Vaughn, Stable Isotope Lab
        Institute of Arctic and Alpine Research
        University of Colorado  CB 450
        Boulder, Colorado  80309

        Office: 303-492-7985                 [log in to unmask]
        Lab:  303-492-5495                    FAX: 303-492-6388
_________________________________________________________



>                Dear list-members,
>
>As I m still working on air pollution I would like to get the most acual
>values possible for d13C and concentration of atmospheric CO2 in
>non-polluted areas (i.e. Greenland or the poles).
>I think this should be around 330 ppm and an isotopic composition of about
>-7,5%o.
>Thank you very much.
>
>David Widory
>Laboratoire de Geochimie des Isotopes Stables-I.P.G.P.
>Universite Paris 7-Denis Diderot
>Tour 54-64 1er etage
>4, place Jussieu
>75252 Paris Cedex 05
>Tel. 44 27 60 88
>Fax. 44 27 28 30