The “Blade” of Ocean2K

Climate Audit

I’ve had a longstanding interest in high-resolution ocean proxies (with posts as early as 2005 – see Ocean Sediment tag) and had already written detailed reviews of many of the individual high-resolution series used in Ocean2K (e.g. herehere herehereherehere). In these prior discussions, the divergence between the 20th century proxy data and 20th century instrumental data had been a major issue.  The non-bladedness of Ocean2K data was therefore unsurprising to me.

Although, for their main figures, the Ocean2K authors made the questionable decisions to voluntarily degrade their data both into 200-year bins and from deg C to SD units, in their Supplementary Information, they identified a network of 21 series with high-resolution extending into the 20th century, showing results in 25-year bins but only for the short period 1850-2000, once again re-scaling, this time using only six values (25-year bins) for each series.

In my first post…

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