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Blog Profile / Climate Audit


URL :http://www.climateaudit.org/
Filed Under:Issues & Causes / Climate Change
Posts on Regator:1041
Posts / Week:3.4
Archived Since:December 20, 2008

Blog Post Archive

Warmest since, uh, the Medieval Warm Period

The money quote in the PAGES2K abstract was that there wasn’t any worldwide Little Ice Age of Medieval Warm Period and that AD1971-2000 temperatures were the highest in nearly 1400 years, long before the Medieval Period: There were no globally synchronous multi-decadal warm or cold intervals that define a worldwide Medieval Warm Period or Little […]

The Third Warmest Arctic Century

PAGES2K (2013) unequivocally stated that the Arctic was “warmest during the 20th century”: The Arctic was also warmest during the twentieth century, although warmer during 1941–1970 than 1971–2000 according to our reconstruction. McKay and Kaufman 2014 did not withdraw or amend the above statement, instead reporting that the revisions had a “fairly minor impact on […]

Gavin Schmidt and the EPA Denial Decision

About eight weeks ago, Jean S postulated that Gavin Schmidt had been involved in writing the documents supporting EPA’s decision denying various petitions for reconsideration of the Endangerment Finding (the “RTP documents“), documents that Mann had cited to the D.C. Show More Summary

Millennial Quebec Tree Rings

In today’s post, I’m going to discuss an important new 1000-year chronology from northern treeline spruce in Quebec (Gennaretti et al 2014, PNAS here).  The chronology is interesting on multiple counts.  This is the first Quebec northern treeline chronology to include the medieval warm period. Show More Summary

Decomposing Paico

In today’s post, Jean S and I are going to show that the paico reconstruction, as implemented in the present algorithm, is very closely approximated by a weighted average of the proxies, in which the weights are proportional to the number of measurements. We are able to show this because we noticed that the contributions […]

New Article on Igaliku

Shortly after the publication of PAGES2K, I pointed out that the Igaliku lake sediment proxy, had been contaminated by modern agricultural runoff. The post attracted many comments. Nick Stokes vigorously opposed the surmise that the Igaliku series had been contaminated by modern agriculture and/or that such contamination should have been taken into account by Kaufman […]

PAGES2K vs the Hanjiharvi Reconstruction

The PAGES2K (2013) Arctic reconstruction of Kaufman et al has attracted considerable attention as a non-Mannian hockey stick. However, it’s been fraught with problems since day one, including a major re-statement of results in August 2014, in which Kaufman conceded (without direct acknowledgement) Climate Audit criticism that their results had been impacted by the use […]

PAGES2K: More Upside Down?

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 […]

Okshola: which way is up?

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 […]

Revisions to Pages2K Arctic

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. Show More Summary

Sliming by Stokes

Stokes’ most recent post, entitled “What Steve McIntyre Won’t Show You Now”, contains a series of lies and fantasies, falsely claiming that I’ve been withholding MM05-EE analyses from readers in my recent fisking of ClimateBaller doctrines, falsely claiming that I’ve “said very little about this recon [MM05-EE] since it was published” and speculating that I’ve […]

ClimateBallers and the MM05 Simulations

ClimateBallers are extremely suspicious of the MM05 simulation methodology, to say the least.  A recurrent contention is that we should have removed the climate “signal” from the NOAMER tree ring network before calculating parameters for our red noise simulations, though it is not clear how you would do this when you not only don’t know the […]

t-Statistics and the “Hockey Stick Index”

In MM05,  we quantified the “hockeystick-ness” of a series as the difference between the 1902-1980 mean (the “short centering” period of Mannian principal components) and the overall mean (1400-1980), divided by the standard deviation – a measure that we termed its “Hockey Stick Index (HSI)”. Show More Summary

What Nick Stokes Wouldn’t Show You

In MM05, we quantified the hockeystick-ness of simulated PC1s as the difference between the 1902-1980 mean (the “short centering” period of Mannian principal components) and the overall mean (1400-1980), divided by the standard deviation – a measure that we termed its “Hockey Stick Index (HSI)”.  In MM05 Figure 2, we showed histograms of the HSI […]

Mike’s NYT trick

There still seems to be a lot of confusion among Mann’s few remaining supporters as to why Phil Jones credited the “trick of adding in the real temps” to Mann’s Nature article (MBH98). Today I will review that topic. Let’s first see what the Great Master himself says about the issue in his book of […]

The implications for climate sensitivity of AR5 forcing and heat uptake estimates

A guest post by Nic Lewis When the Lewis & Crok report “A Sensitive Matter” about climate sensitivity in the IPCC Fifth Assessment Working Group 1 report (AR5) was published by the GWPF in March, various people criticised it for not being peer-reviewed. But peer review is for research papers, not for lengthy, wide-ranging review […]

Kevin O’Neill’s “Fraud” Allegations

Over the past year or so, Mann’s “ClimateBall” defenders have taken an increasing interest in trying to vindicate Mannian principal components, the flaws of which Mann himself has never admitted.  Indeed, in Mann’s self-serving Hockey...Show More Summary

Black Tuesday of Climate Science

Today I will review the timeline of the above WMO 1999 graph in the light of the ClimateGate (CG) letters. The main events took place on Tuesday, November 16th, 1999. Things start rolling 9 AM (UK time), when Tim Osborn sends  the new Briffa and recalibrated Jones (1998) time series to Phil Jones along with […]

Inventory of Hide-the-Decline

In a recent post, I reported on the diagram in Jones 1998 (Science), which pushed hide-the-decline a year earlier than my previous inventory. (The Briffa bodge, an earlier technique, dates back to 1992 and Jones 1998 is a sort-of transition from the Briffa bodge to truncation as hide-the-decline technology.) I’ve had a few requests for […]

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