The recent revisions to PAGES2K included a dramatic flipping of the Hvitarvatn varve series to the opposite orientation used in the 2013 version used in IPCC AR5. Together with other changes (such as a partial – but still incomplete – removal of contaminated sediments from the Igaliku series), this unwound most of the previous difference […]
Kaufman and the PAGES2K Arctic2K group recently published a series of major corrections to their database, some of which directly respond to Climate Audit criticism. The resulting reconstruction has been substantially revised with substantially increased medieval warmth. His correction of the contaminated Igaliku series is unfortunately incomplete and other defects remain.
PAGES2K Arctic introduced a lake sediment d18O series from Kepler Lake, Alaska that hadn’t been used in previous studies. Although O18 data is a workhorse of paleoclimate, O18 data from Alaska (or, for that matter, anywhere in the Arctic hemisphere between 90E and 90W – going east) is very scarce. Thus, the appearance of a […]
In a previous post on PAGES2K Arctic, I pointed out that they had used the Hvitarvatn, Iceland series (PAGES2K version shown below), upside-down to the interpretation of the original authors (Miller et al), who had interpreted thick varves as evidence of the Little Ice Age. A few days ago, Miller and coauthors archived a variety […]
I’m listening to a presentation by PAGES2K authors sponsored by Nature: http://blogs.nature.com/ofschemesandmemes/2013/05/02/npg-journal-club-how-has-earths-climate-changed-in-the-past-2000-years-npgjclub#comment-1503 Started at 11 am Eastern. 11:30. Open for questions. I have submitted the following: Can you explain the decision to label the article as only a “Progress Article”, rather than a Research Article? Nature’s definition of Progress Articles http://www.nature.com/ngeo/authors/content_types.html says that such articles […]
The PAGES2K Arctic reconstruction uses Gifford Miller’s Hvitavatn (Iceland) data upside down. The error “matters” because this series is one of rather few PAGES2K series that show a Hockey Stick. Such gross errors ought to be corrected before the data is cited for policy purposes or said to confirm previous studies.
The PAGES2K article to be published tomorrow will show eight regional reconstructions, which are plotted below. In today’s post, I’ll try to briefly summarize what, if anything, is new about them. Antarctica: This is a composite of 11 isotope series (mostly d18O). It includes some new data (e.g. Steig’s new WAIS series) and some long […]
A commenter observed that the forthcoming PAGES2K received over 50 pages of review comments from one reviewer. One wonders what he had to say about the PAGES2K South American network which has some very odd characteristics. Here is a list of proxies with a couple of interesting features highlighted. First, note that the “proxy” network […]
March 15, 2013 was the IPCC deadline for use in AR5 and predictably a wave of articles have been accepted. The IPCC Paleo chapter wanted a graphic on regional reconstructions and the PAGES2K group has obligingly provided the raw materials for this graphic, which will be published by Nature on April 21. Thanks to an […]
Climate Audit 