Nearly all of the text of this article on an interesting ice core proxy series (James Ross Island) from the Antarctic Peninsula was written in June 2014, but not finished at the time for reasons that I don’t recall. This proxy was one of 16 proxy series in the Kaufman 12K pdf. 60-90S reconstruction. I […]
I’m going to Erice next week and will be talking about proxies over the Holocene, a topic that I’ve been studying for a few years, but not written much about. In today’s post, I’m going to discuss Greenland ice core d18O over the Holocene and comment on very inaccurate commentary from Skeptical Science about […]
In today’s post, I’ll return to more typical Climate Audit programming. Upside-down Mann’s mentor, Raymond Bradley, has somewhat surprisingly published an article (Balascio et al 2015) that supports a longstanding Climate Audit criticism of varve proxies. Bradley and coauthors did not report that their interpretation of an important Baffin Island series is upside-down to the […]
One of my long-standing interests is the location of ocean sediment series that enable apples-to-apples comparison of the 20th century to the mid-Holocene. These are not nearly as common as one would think. Ocean sediment series covering the Holocene typically stop prior to the 20th century due to core recovery problems and, on […]
The MD99-2275 core offshore Iceland is a very high-resolution ocean sediment core, results of which over the past millennium have been discussed here from time to time. Alkenone and diatom results for the last millennium have been available for about 10 years. MD99-2275 results were used in PAGES2K Arctic and Hanhijarvi 2013, also Trouet et […]
TN05-17 is by far the most influential Southern Hemisphere core in Marcott et al 2013- it’s Marcott’s YAD061, so to speak. Its influence is much enhanced by the interaction of short-segment centering in the mid-Holocene and non-robustness in the modern period. Marcott’s SHX reconstruction becomes worthless well before the 20th century, a point that they […]
The longest very high-resolution alkenone core that I’m aware of is Sicre et al’s MD99-2275 (plus splices) from offshore Iceland (67N 18W). It is 4550 years long, its most recent value is 2001AD and its resolution is 4 years. Marcott used nearby core JR51GC-35 (also at 67N 18W), also an alkenone record, which had a […]
I’m going to do a detailed post on my diagnosis of the Marcott uptick, but before I do so, I want to comment on the reconstructions for NH and SH extratropics, neither of which have attracted sufficient notice though both are very remarkable. In a substantive sense, because orbital changes have different effects on NH […]
Rob Wilson (by email) has drawn my attention to the SI to Esper et al 2012 SI, which contains the following diagram relevant to late Holocene treeline changes. Figure 1. From Esper et al 2012 SI.
At Lewandowsky’s blog here, conspiracy theorist John Mashey has challenged Deming’s “get rid of the MWP” recollection claiming that: Nobody in 1995 would have been worried about “getting rid of the MWP,” although they might have wanted to dispel the idea the Lamb schematic was Truth. They had years before abandoned the schematic… Anyone citing […]
Climate Audit 