New Data and Upside-Down Moberg

Climate Audit

I’ve been re-examining SH proxies for some time now, both in connection with PAGES2K and out of intrinsic relevance.  In today’s post, I’ll report on a new (relatively) high-resolution series from  the Arabian Sea offshore Pakistan (Boll et al 2014, Late Holocene primary productivity and sea surface temperature variations in the northeastern Arabian Sea: implications for winter monsoon variability, pdf).  The series has considerable ex ante interest on a couple of counts. Alkenones yield temperature proxies that have a couple of important advantages relative to nearly all other temperature “proxies”: they are calibrated in absolute temperature (not by anomalies); and they yield glacial-interglacial patterns that make “sense”. No post hoc screening or trying to figure out which way is up.  In the extratropics, their useful information is limited to summer season, but so are nearly all other proxies. Though more or less ignored in IPCC AR5, the development of alkenone…

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