Does it matter whether proxies are used upside-down or not?
Maybe not in Mann-world (where, in response to our criticism at PNAS, Mann claimed that it was impossible for him to use series upside-down). But, unlike Mann, Darrell Kaufman acknowledges responsibility for using proxies upside-up. Unfortunately, he and the PAGES2K authors don’t seem to be very diligent in ensuring that they do so.
Shortly after release of PAGES2K, I observed that they used both Hvitarvatn and Quelccaya upside-down (the latter on Neukom’s watch.) I also observed that correct orientation of Hvitarvatn ought to have a knock-on impact on Big Round Lake, which matched Hvitarvatn about as closely as two distinct proxies could be expected. Thus far, Kaufman’s already corrected upside-down Hvitarvatn: Big Round Lake should be in play as well. This inconsistency is something that ought to have been “assessed” in an assessment report, but wasn’t.
In a previous post…
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