| Value |
10000
unitless
|
| Organism |
Biosphere |
| Reference |
Johnston DT, Wolfe-Simon F, Pearson A, Knoll AH. Anoxygenic photosynthesis modulated Proterozoic oxygen and sustained Earth's middle age. Proc Natl Acad Sci U S A. 2009 Oct 6 106(40):16925-9. doi: 10.1073/pnas.0909248106 supporting information left column top paragraphPubMed ID19805080
|
| Method |
"[Researchers] begin by setting the mass of the atmosphere at 5X10^18
kg and 20% O2
for modern examples. Central to linking marine
fluxes to atmospheric compositions is an appreciation for scale,
understanding that today, at 20% PO2, 10,000 times more O2
resides in the atmosphere than in the ocean (given an average
dissolved oxygen content of 300 ppm)." |
| Comments |
"That said [in "Measurement Method" above], calculated
changes in O2 production are viewed in the context of the mass
of the atmosphere and not the volume of the ocean (the solubility
of O2 in seawater will scale with PO2
and, to a lesser extent,
temperature)." |
| Entered by |
Uri M |
| ID |
110489 |