Resplandy et al. Part 5: Final outcome

Climate Etc.

By Nic Lewis

Readers may recall that last autumn I wrote several article critiquing the Resplandy et al. (2018) ocean heat uptake study in Nature, which was based on measured changes in the O2/N2 ratio (δO2/N2) and CO2 atmospheric concentration. These were combined to produce an estimate (ΔAPOObs) of changes in atmospheric potential oxygen since 1991, from which they isolated a component (ΔAPOClimate) that can be used to estimate the change in ocean heat content. In four articles, here and here, here, and here, I set out why I thought the trend in ΔAPOClimate – and hence their ocean heat uptake estimate – was overstated, and its uncertainty greatly understated, essentially because of errors in their statistical methodology.  The bulk of my criticisms were largely accepted by the authors of the study. However, it…

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