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Climate Audit

Climate Audit - 2017-07-22 - Original post - cached version

Arctic lake sediment series have been an important component of recent multiproxy studies.  These series have been discussed on many occasions at Climate Audit (tag), mostly very critical.  PAGES 2017 (and related Werner et al 2017) made some interesting changes to the Arctic lake sediment...

Climate Audit - 2017-07-12 - Original post - cached version

Rosanne D’Arrigo once explained to an astounded National Academy of Sciences panel that you had to pick cherries if you wanted to make cherry pie – a practice followed by D’Arrigo and Jacoby who, for their reconstructions, selected tree ring chronologies which went the “right” way and discarded...

Climate Audit - 2017-07-12 - Original post - cached version

Recently, there has been controversy over allegations that former FBI Director Comey leaked classified information, an issue that I mentioned on twitter  a month ago. The recent news-cycle began with a story in The Hill,  leading to a tweet by Trump, followed by a series of sneering “rebuttals”...

Climate Audit - 2017-07-08 - Original post - cached version
A guest post by Nic Lewis

A new paper in Science Advances by Cristian Proistosescu and Peter Huybers “Slow climate mode reconciles historical and model-based estimates of climate sensitivity” (hereafter PH17) claims that accounting for the decline in feedback strength over time that occurs in...

Climate Audit - 2017-06-19 - Original post - cached version
A guest article by Frank Bosse (posted by Nic Lewis)

A recent paper by the authors Stolpe, Medhaug and Knutti (thereafter S. 17) deals with a longstanding question: By how much are the Global Mean Surface Temperatures (GMST) influenced by the internal variability of the Atlantic (AMV/AMO) and...

Climate Audit - 2017-05-18 - Original post - cached version

A guest post by Nic Lewis

Introduction

Global surface temperature (GMST) changes and trends derived from the standard GISTEMP[1] record over its full 1880-2016 length exceed those per the HadCRUT4.5 and NOAA4.0.1 records, by 4% and 7% respectively.  Part of these differences will...

Climate Audit - 2016-11-19 - Original post - cached version

November 18 marks the centenary of the end of the Battle of the Somme, an event that passed essentially unnoticed, though it was a seminal event in the development of modern Canada. Its carnage was over 1.1 million casualties from a combined population (both sides) of about 170 million. (For a...

Climate Audit - 2016-11-04 - Original post - cached version

Despite extraordinarily intense coverage of all aspects of Hillary Clinton’s emails, all commentary to date (to my knowledge), even the underlying FBI Report, has paid little to no attention to the destruction of Huma Abedin’s emails, also stored on the Clinton server.  Further, even with the...

Climate Audit - 2016-08-31 - Original post - cached version
A guest post by Nic Lewis

Introduction

A recent PAGES 2k Consortium paper in Nature,[i] Abram et al., that claims human-induced, greenhouse gas driven warming commenced circa 180 years ago,[ii] has been attracting some attention. The study arrives at its start dates by using a change-...

Climate Audit - 2016-08-17 - Original post - cached version

In today’s post, I’m going to re-examine (or more accurately, examine de novo) Ed Cook’s Mt Read (Tasmania) chronology, a chronology recently used in Gergis et al 2016, Esper et al 2016, as well as numerous multiproxy reconstructions over the past 20 years.

Gergis et al 2016  said that...

Climate Audit - 2016-08-14 - Original post - cached version

Jan Esper, prominent in early Climate Audit posts as an adamant serial non-archiver, has joined with 17 other tree ring specialists, to publish “Ranking of tree-ring based temperature reconstructions of the past millennium” (pdf). This assesses 39 long tree ring temperature reconstructions. The...

Climate Audit - 2016-08-03 - Original post - cached version

In today’s post, I’m going to examine Gergis’ dubious screening out of the Law Dome d18O series, a series that has been of long-standing interest at Climate Audit (tag).

Gergis et al 2016 stated that they screened proxies according to significance of the correlation to local gridcell...

Climate Audit - 2016-07-22 - Original post - cached version

In 2012, the then much ballyhoo-ed Australian temperature reconstruction of Gergis et al 2012 mysteriously disappeared from Journal of Climate after being criticized at Climate Audit. Now, more than four years later, a successor article has finally been published. Gergis says that the only...

Climate Audit - 2016-07-21 - Original post - cached version

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Climate Audit - 2016-07-12 - Original post - cached version
A guest post by Nic Lewis

 

Introduction and Summary

In a recently published paper (REA16),[1] Mark Richardson et al. claim that recent observation-based energy budget estimates of the Earth’s transient climate response (TCR) are biased substantially low, with the true value some...

Climate Audit - 2016-06-07 - Original post - cached version

I’ve submitted an article entitled “New Light on Deflategate: Critical Technical Errors” pdf to Journal of Sports Analytics. It identifies and analyzes a previously unnoticed scientific error in the technical analysis included in the Wells Report on Deflategate. The article shows precisely how...

Climate Audit - 2016-05-06 - Original post - cached version

In my most recent post,  I discussed yet another incident in the long running dispute about the inconsistency between models and observations in the tropical troposphere – Gavin Schmidt’s twitter mugging of John Christy and Judy Curry.   Included in Schmidt’s exchange with Curry was a diagram...

Climate Audit - 2016-04-19 - Original post - cached version

In the past few weeks, I’ve been re-examining the long-standing dispute over the discrepancy between models and observations in the tropical troposphere.  My interest was prompted in part by Gavin Schmidt’s recent attack on a graphic used by John Christy in numerous presentations (see recent ...

Climate Audit - 2016-03-21 - Original post - cached version

A guest article by Nic Lewis

Introduction

In a recent article I discussed Bayesian parameter inference in the context of radiocarbon dating. I compared Subjective Bayesian methodology based on a known probability distribution, from which one or more values were drawn at random,...

Climate Audit - 2016-03-12 - Original post - cached version

A guest article by Nic Lewis

I reported in a previous post, here, a number of serious problems that I had identified in Marvel et al. (2015): Implications for climate sensitivity from the response to individual forcings. This Nature Climate Change paper concluded, based purely on...

Climate Audit - 2016-03-02 - Original post - cached version

A guest article by Nic Lewis

Introduction

In April 2014 I published a guest article about statistical methods applicable to radiocarbon dating, which criticised existing Bayesian approaches to the problem. A standard – subjective Bayesian – method of inference about the true calendar age...

Climate Audit - 2016-02-27 - Original post - cached version

Gerry Browning writes:

The Correct System of Equations for Climate and Weather Models

The system of equations numerically approximated by both weather and climate models is called the hydrostatic system. Using a scale analysis for mid-latitude large scale motions in the...

Climate Audit - 2016-02-15 - Original post - cached version

In today’s post, I’m going to critically examine another widely used tree ring chronology: the Icefields (Alberta) MXD RCS chronology of Luckman and Wilson (2005 pdf), used most recently in Wilson et al 2016.

I’ll show that the RCS technique used in the LW2005 MXD chronology eliminated...

Climate Audit - 2016-02-14 - Original post - cached version

Last week, I posted on the effect of ex post site selection on the Gulf of Alaska tree ring chronology used in Wilson et al 2016 (from Wiles et al 2014).  An earlier incarnation of this chronology (in D’Arrigo et al 2016) had had a severe divergence problem, a problem that Wiles et al had...

Climate Audit - 2016-02-12 - Original post - cached version

A guest article by Nicholas Lewis

Introduction

Gavin Schmidt has finally provided, at the GISS website, the iRF and ERF forcing values for a doubling of CO2 (F2xCO2) in GISS-E2-R, and related to this has made wholesale corrections to the results of Marvel et al. 2015 (MEA15). He has...

Climate Audit - 2016-02-08 - Original post - cached version

Wilson et al 2016, like D’Arrigo et al 2006, includes a ‘Polar Urals’ chronology as one of its components.  Tree ring chronologies from Polar Urals and Yamal have long been a contentious issue at Climate Audit, dating back to the earliest days (see tags Yamal, Polar Urals).

Whereas the D’...

Climate Audit - 2016-02-03 - Original post - cached version

The bias arising from ex post selection of sites for regional tree ring chronologies has been a long standing issue at Climate Audit, especially in connection with Briffa’s chronologies for Yamal and Polar Urals (see tag.)  I discussed it most recently in connection with the Central Northwest...

Climate Audit - 2016-01-29 - Original post - cached version

One of the longest standing Climate Audit issues with paleoclimate reconstructions is ex post decisions on inclusion/exclusion of data, of which ex post decisions on inclusion/exclusion of sites/data in “regional [treering] chronologies” is one important family.  This was the issue in the ...

Climate Audit - 2016-01-21 - Original post - cached version

A guest article by Nicholas Lewis

Introduction

In a recent article I discussed the December 2015 Marvel et al.[1] paper, which contends that estimates of the transient climate response (TCR) and equilibrium climate sensitivity (ECS) derived from recent observations of changes in...

Climate Audit - 2016-01-19 - Original post - cached version

I was very saddened to learn of the sudden death of Bob Carter ( here here).   He was one of the few people in this field that I regarded as a friend.  He was only a few years older than me and we got along well personally.

I will not attempt to comment on his work as that is covered...

Climate Audit - 2016-01-09 - Original post - cached version

A guest article by Nicholas Lewis

Note: This is a long article: a summary is available here.

Introduction

In a recent paper[1], NASA scientists led by Kate Marvel and Gavin Schmidt derive the global mean surface temperature (GMST) response of the GISS-E2-R climate model to...

Climate Audit - 2016-01-05 - Original post - cached version

The strong El Nino has obviously caused great excitement in the warmist community.  It should also cause any honest skeptic/lukewarmer to re-examine whether observations remain inconsistent with models. In today’s post, I’ll show two comparisons: 1) CMIP5 models (TAS) vs HadCRUT4; 2) CMIP5...

Climate Audit - 2015-12-23 - Original post - cached version

In the wake of COP21, I thought that it would be interesting to compare the respective pathways of China and the U.S (and others) based on official data. I still plan to post on this topic, but obtaining official data on the pathways proved much more difficult than I anticipated.  Leading into...

Climate Audit - 2015-12-10 - Original post - cached version

There was some publicity this week on a paper by Young et al (Science Advances, 2015), which, according to Gifford Miller , whose work has been frequently discussed at CA (see  tag), had supposedly put the “coup de grace on the Medieval Warm Period”, that had been so long wished for by the Team...

Climate Audit - 2015-12-08 - Original post - cached version

Just before leaving for Paris, the Canadian government, like many others,  stated that “science” was “telling us” that climate change was “one of the greatest threats of our time”.

The scientific evidence is clear: climate change is one of the greatest threats of our time. The...

Climate Audit - 2015-12-02 - Original post - cached version

Like many others, I was interested in the recent controversy arising from findings of Zwally et al 2015 that there had been ice mass gain gain of ~112±61 Gt/year over 1992-2001 and ~82±25 Gt/year over 2003-2008.  Zwally’s findings obviously contradict a widely held contrary belief, expressed,...

Climate Audit - 2015-09-28 - Original post - cached version

Roger Pielke Jr recently made the remarkable discovery that, in addition to his university salary from George Mason University (reported by Pielke as $250,000), Jagadish Shukla, the leader of the #RICO20, together with his wife, had received a further $500,000 more in 2014 alone from federal...

Climate Audit - 2015-09-25 - Original post - cached version

The RICO-20 gang of climate academics commenced its supposed campaign against misinformation with false information about skeptic reactions to the Cuccinelli investigation. Barry Klinger, one of Shukla’s hangers-on at George Mason University,  stated:

However, I don’t...

Climate Audit - 2015-09-19 - Original post - cached version

I’ve had a longstanding interest in high-resolution ocean proxies (with posts as early as 2005 – see Ocean Sediment tag) and had already written detailed reviews of many of the individual high-resolution series used in Ocean2K (e.g. here here here here here here). In these prior discussions, the...

Climate Audit - 2015-09-04 - Original post - cached version

The long-awaited (and long overdue) PAGES2K synthesis of 57 high-resolution ocean sediment series (OCEAN2K) was published a couple of weeks ago (see here here). Co-author Michael Evans’ announcement made the results sound like the latest and perhaps most dramatic Hockey Stick yet:

...
Climate Audit - 2015-09-01 - Original post - cached version

In Financial Post here. My submitted version was a little harsher. #deflategate For related blog posts, see tag here.

Climate Audit - 2015-08-10 - Original post - cached version

In today’s post,  I’m going to show the Deflategate data from a new perspective.   Rather than arguing about whether the Patriots used the Logo gauge, I’ve assumed, for the sake of argument, the NFL’s conclusion that the Non-Logo gauge was used, but gone further (as they ought to have done). I’...

Climate Audit - 2015-08-08 - Original post - cached version
On June 29, I sent a letter to Ted Wells, notifying him of the erroneous description of key figures in the Exponent report, but did not receive any acknowledgement.  In the presumption that Daniel Marlow of Princeton is more likely to be concerned about the erroneous research record (as well as...
Climate Audit - 2015-08-07 - Original post - cached version

In an earlier article,  I pointed out that essential figures in the Exponent report contained (what appeared to be) an important misrepresentation: that transients purporting to represent Logo gauge initialization had not really been initialized with the Logo gauge.  The same point was later (...

Climate Audit - 2015-08-05 - Original post - cached version

The transcript of the Brady appeal before Goodell has been released and it’s astonishing to see how the sausage was made.  It raises many issues, one of which I’ll discuss in today’s post.

In my previous commentary on the case, I’ve drawn attention to the fact that NFL officials at half-...

Climate Audit - 2015-07-29 - Original post - cached version

Yesterday, Roger Goodell released his decision on the Brady appeal.

Most of the early discussion has been about Brady’s destruction of his cell phone. Brady has contested the NFL’s characterization of this incident here (see cover here), saying that he had replaced a broken phone; that ...

Climate Audit - 2015-07-08 - Original post - cached version

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...

Climate Audit - 2015-07-03 - Original post - cached version

Further to my series of posts on Deflategate, reader chrimony observed that my statistical analysis had shown that it was possible that there had been no tampering, but had not excluded the possibility of tampering.  This is a sensible observation, but raises the question of whether and how one...

Climate Audit - 2015-06-29 - Original post - cached version

In my first writeup, I observed that Exponent’s Logo transients appeared to be bodged too high, even with their unwarranted and adverse use of 67 deg F initialization (Exponent’s “temperature trick”). In today’s post, I’ve taken a closer look at the seemingly questionable calculation of the...

Climate Audit - 2015-06-28 - Original post - cached version

One of the ironies of the NFL’s conduct in this affair is that it can be established that NFL officials (under the supervision of NFL Executive Vice President Troy Vincent) over-inflated Patriot balls at half-time, the only proven tampering with Patriot balls. Brady and the Patriots were...

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