Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3819606l&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 19, CiteID L19606
Physics
3
Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Isotopic Composition And Chemistry (1041, 4870)
Scientific paper
Recently, the method for estimation of marine gross production from measurements of 17O/16O and 18O/16O of dissolved O2 has been improved by obtaining a rigorous equation for evaluation of gross production, and it has been suggested that small errors associated with approximations resulted in significant underestimation of gross production rates. The new equation requires accurate knowledge of the isotopic composition of photosynthetic and atmospheric oxygen. While the values for the latter have been determined very precisely, those of the former have never been measured. Here we present the first experimentally derived values of δ17Op and δ18Op of marine photosynthetic O2 (-10.126 and -20.014 ‰). Based on these, we show that the suggested underestimation was not the result of approximation errors, rather it was caused by inaccurate estimated values of δ17Op and δ18Op.
Barkan Eugeni
Luz Boaz
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