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Comment
. 2013 Sep 3;110(36):14514-5.
doi: 10.1073/pnas.1313197110. Epub 2013 Aug 23.

A cold, hard look at ancient oxygen

Boswell A Wing  1
Affiliations
Comment

A cold, hard look at ancient oxygen

Boswell A Wing. Proc Natl Acad Sci U S A. .
No abstract available

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Conflict of interest statement

The author declares no conflict of interest.

Figures

Fig. 1.
Fig. 1.
Estimates of globally integrated photosynthetic O2 flux relative to recent preanthropogenic values. Red-filled circles are exploratory estimates made from CO2 proxies and measured 17O anomalies in sulfate minerals. Blue-filled rectangles estimated from vegetation–biogeochemistry model and general circulation model simulations (19). Black-filled rectangle estimated from CO2 abundances and 17O anomalies in O2 in gas samples extracted from ice cores (9, 10). Gray band is an envelope of variability for the exploratory formula image estimates, green solid line is the recent preanthropogenic formula image value, and black dashed line is the Permian–Triassic boundary.
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Comment on

References

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