In my search for high-resolution ocean sediment records, I stumbled across an interesting 1995 article by Domack et al (Domack of the Larsen Ice Shelf) discussing cores on the west side of the Antarctic Peninsula which were dated over the last 2000 years.
Lloyd Keigwin’s Sargasso Sea study was done using 1 cm core intervals; the Arabian Sea RC2730 percentage G bulloides was calculated using 2 mm core intervals (although slower sedimentation meant that the time intervals were mitigated somewhat.) see http://www.climateaudit.org/?p=898 . G bulloides percentage is interesting a measure of upwelling, but isn’t a proxy for SST. […]
Juckes discusses the Divergence Problem as follows: Particular concerns have been raised about … the high latitude Eurasian trees (which have and anomalously low growth anomaly in the late 20th century — Tornetraesk, Fennoscandia, Yamal, Northern Urals in Table 1) No one has ever said that Yamal has an anomalously low growth anomaly in the […]
Keigwin’s Sargasso Sea temperature reconstruction, used in Moberg et al 2005, was de-selected by Juckes in what he represented to be the Moberg CVM composite and in making the Union composite (although he managed to use Tornetrask twice ?!? under different names). Although he de-selected the Sargasso Sea temperature reconstruction, he used Moberg’s Arabian Sea […]
This is not going to be an especially interesting post for most (probably any) of you, but I want to document a couple of points mostly as an aide-memoire for myself so I don’t forget. I actually learned something new about the Jones et al reconstruction from the Euro Team study. I’ve been able to […]
Kevn UK writes in: "I’ve just been to the Climate in the Past and have just spotted the following report “The origin of the European “Medieval Warm Period” H. Goosse, O. Arzel, J. Luterbacher, M. E. Mann, H. Renssen, N. Riedwyl, A. Timmermann, E. Xoplaki, and H. Wanner” “Abstract. Proxy records and results of a […]
Readers of this blog are familiar with the Yamal subsitution. Briefly, Briffa et al 1995 reported in Nature that 1032 was the coldest year of the millennium based on no more than 3 poorly dated and short cores in the 11th century. Subsequently new cores were dated to the 11th century by Schweingruber, resulting in […]
The Hegerl et al 2006 climate reconstruction is finally online here . I’m going to go through the proxies individually before talking about method. Obviously the first one to look for is Mann’s North American PC1. Although they say that they’ve “moved on”, Mann’s PC1 was used in Osborn and Briffa 2006 and was one […]
Hot off the press this week is a study on foraminera over the last millennium in the Indo-Pacific Warm Pool – something that you’d think would be relevant to Hansen’s attempts to splice modern instrumental records to core tops ending in the Holocene Optimum. Newton et al 2006 have the following abstract:
Last year, when Moberg was published, I pointed out witha slightly arched eyebrow that one of the two most important contributors to any 20th century HS-ness in Moberg was the increasing percentage of subpolar foraminifera (G. Bulloides) in the Arabian Sea – intuitively not a direct indicator of warming. Having visited the foraminifera literature in […]
Climate Audit 