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Oxygen isotope fractionation in the ocean surface and 18O/16O of atmospheric O2.
- Source :
- Global Biogeochemical Cycles; Dec2011, Vol. 25 Issue 4, pGB4006-GB4006, 2p
- Publication Year :
- 2011
-
Abstract
- We have recently published a new evaluation of Earth's Dole effect, which was based, in part, on measurements of δO2/Ar, δ<superscript>17</superscript>O and δ<superscript>l8</superscript>O of dissolved argon and oxygen in the ocean surface. In calculations of the oxygen isotope effect due to photosynthesis and respiration (Ɛ<subscript>up</subscript>), gross O<subscript>2</subscript> production (G) was an important factor. However, our estimates of G were based on an approximate equation, and in a recent publication it has been suggested that G obtained with this equation could be underestimated by about 33%. If true, such underestimation of G might lead to different Ɛ<subscript>up</subscript> values. To test this possibility, we have used a new rigorous equation with relevant information on isotopic composition of photosynthetic O<subscript>2</subscript> and recalculated Ɛ<subscript>up</subscript>. Given the uncertainties, the new values do not differ from the previous ones, and therefore, the implications of the strong fractionation in the upper ocean (~25‰) to the global Dole effect remain as in our original publication. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08866236
- Volume :
- 25
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Global Biogeochemical Cycles
- Publication Type :
- Academic Journal
- Accession number :
- 70702396
- Full Text :
- https://doi.org/10.1029/2011GB004178