Oxygen isotope fractionation in the ocean surface and 18O/16O of atmospheric O2
Oxygen isotope fractionation in the ocean surface and 18O/16O of atmospheric O2
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海洋表面氧同位素分馏和大气 O2 的 18O/16O
DOI：
10.1029/2011gb004178
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发表时间：
2011
影响因子：
5.2
通讯作者：
E. Barkan
中科院分区：
文献类型：
--
作者：
B. Luz;E. Barkan
我们最近发表了一项关于地球多尔效应的新评估，该评估部分基于对海洋表面溶解氩和氧的δ O 2/Ar、δ 17 O和δ 18 O的测量。在计算由于光合作用和呼吸作用（CO2）引起的氧同位素效应时，总O2产量（G）是一个重要因素。然而，我们对G的估计是基于一个近似方程，在最近的一份出版物中，有人建议用这个方程得到的G可能被低估了约33%。如果是真的，这种对G的低估可能会导致不同的补偿值。为了测试这种可能性，我们已经使用了一个新的严格的方程与光合O2的同位素组成和重新计算的CO2。考虑到不确定性，新的值与以前的值没有区别，因此，海洋上层的强分馏（25‰）对全球多尔效应的影响与我们最初的出版物一样。
We have recently published a new evaluation of Earth's Dole effect, which was based, in part, on measurements of δO2/Ar, δ17O and δ18O of dissolved argon and oxygen in the ocean surface. In calculations of the oxygen isotope effect due to photosynthesis and respiration (ɛup), gross O2 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 ɛup values. To test this possibility, we have used a new rigorous equation with relevant information on isotopic composition of photosynthetic O2 and recalculated ɛup. 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.