Jan Kaiser, How accurate do we know 13C/12C, 18C/16O and 17O ...
Jan Kaiser, How accurate do we know 13C/12C, 18C/16O and 17O ...
Jan Kaiser, How accurate do we know 13C/12C, 18C/16O and 17O ...
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Influence of 17 Δ on the computed 13 δ value<br />
17<br />
17 18 0.528 17<br />
18<br />
δ = (1+<br />
Δ)(1+<br />
δ ) −1≈<br />
Δ + 0.528 δ + ...<br />
13<br />
δ =<br />
≈<br />
≈<br />
(1+<br />
(1+<br />
2C<br />
)<br />
2C<br />
)<br />
1.0703<br />
45<br />
45<br />
45<br />
δ − 2C<br />
17<br />
δ<br />
δ − 0.528 × 2C<br />
δ − 0.0371<br />
18<br />
18<br />
δ − 2C<br />
δ − 0.0703<br />
17<br />
Δ<br />
17<br />
Δ<br />
17<br />
Δ(atm. O 2 ) = –0.25 ‰ (Barkan & Luz 2000)<br />
17<br />
Δ(trop. CO 2 ) = +0.65 ‰ (Hoag et al. 2005)<br />
This could lead to systematic offsets in 13 δ<br />
bet<strong>we</strong>en –0.05 <strong>and</strong> 0.02 ‰, depending on CO 2 source.
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