Category Archives: Modeling

Cloud Super-Parameterization and Low Climate Sensitivity

“Superparameterization” is described by the Climate Process Team on Low-Latitude Cloud Feedbacks on Climate Sensitivity in an online meeting report (Bretherton, 2006) as: a recently developed form of global modeling in which the parameterized moist physics in each grid column of an AGCM is replaced by a small cloud-resolving model (CRM). It holds the promise […]

Re-Visiting CCSP 1.1 on Lapse Rate Trends

As noted in an earlier post, I’ve now managed to synchronize 48 of 49 Santer tropo series with KNMI surface temperature series and have looked at versions of some key figures in CCSP 1-1 and previously inaccessible figures in Santer. First here is an important figure from CCP 1-1 showing a histogram of relative trends […]

Deciding Which Runs to Archive

Have any of you seen any articles discussing which model runs are archived? It doesn’t appear to me that all model runs are archived. So what criteria are used to decide which model runs are archived by the modelers at PCMDI? (This is a different question than IPCC selections from the PCMDI population.) We’re all […]

A1B and 20CEN Models

Lucia did a recent post on the construction of IPCC Figure 9.5, which I’d also been looking at in light of the Santer model information but I had different issues in mind. IPCC Figure 9.5 says that they extended selected 20th century runs (the “20CEN” models) with A1B models in order to produce the graph […]

Mannian Collation by Santer

I reported a while ago on Santer’s refusal to provide the T2 and T2LT data as collated. Despite Santer’s rude refusal, PCMDI placed the data online anyway, notifying me that this had been their plan along. I reported on this at the time, but so far haven’t reported on the collated data. The T2 and […]

Connolley co-author: “Unfortunately we have deleted all the NetCDF files…”

Recently, I made a request to Thomas Bracegirdle, junior partner of Connolley and Bracegirdle, for the model data used in two recent articles: Bracegirdle and Connolley (GRL 2007) about 20th century Antarctic models; and Bracegirdle, Connolley and Turner (JGR 2008) about 21st century Antarctic models. William Connolley is well known in the blogosphere, especially for […]

Tropical Troposphere – March 2009

Lucia, Anthony, Roy Spencer and David Stockwell (my, there’s a growing list of analytical blogs) have already posted on March 2009 temperatures and trends. While I’m not first off the mark on this, I’ll be the first to post tropical trends – something that I do from time to time. (This requires a little bit […]

Regular and "Special Decisions"

A couple of months ago, as I mentioned at the time, Ross and I submitted a paper to International Journal of Climatology discussing Santer, Schmidt et al versus Douglass et al. I just checked the status of the submission at the journal website and learned that the submission is subject to a “Special Decision”. We […]

Santer's Boss Seeks to "Clarify Mis-Impressions"

David Bader, PhD, the Director, Program for Climate Model Diagnosis and Intercomparison, writes today seeking to “clarify several mis-impressions on your “” web site” regarding the archiving of Santer’s data, the correspondence being shown below. Readers may recall an earlier post here in which I requested data from Santer et al 2008, in response to […]

Submitted Article on Tropical Troposphere Trends

Yesterday Ross and I submitted an article to IJC with the following abstract: A debate exists over whether tropical troposphere temperature trends in climate models are inconsistent with observations (Karl et al. 2006, IPCC (2007), Douglass et al 2007, Santer et al 2008). Most recently, Santer et al (2008, herein S08) asserted that the Douglass […]


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