Category statistics

oat_compare

Sensitivity analysis with R

After last week’s post, I thought it might be useful to have some practical examples of how to do sensitivity analysis (SA) of complex models (like climate models) with an emulator. SA is one of those things that everyone wants to do at some point, and I’ll be able to point people here for code […]

On the existence of the hiatus

A new paper by Karl et al. in Science makes a spirited argument that there really is no “hiatus” or “slowdown” in global surface temperature warming. The paper focuses on some of the more technical details of bias correction in the temperature data record, rather than on the dynamics of the climate. It is from a […]

Screen Shot 2015-02-23 at 09.56.23

Internal variability in surface temperature and the hiatus

Our paper Quantifying the likelihood of a continued hiatus in global warming is published today in Nature Climate Change. Here is the New Scientist take, the Carbon Brief take, and the Met Office Research News article. Chris Roberts took on a huge task, processing massive amounts of data in the CMIP5 climate model archive, and leading […]

heights

A brief comment on timing

In a comment on Mora et al. (2013), we highlight some errors the authors make in calculating and expressing the uncertainty in the timing of  “climate departure” – the time at which a particular place on Earth will see a climate unprecedented in the historical record. There is a reply by the authors of the […]

The great thing about UQ is we know how to spell it

It’s been pretty busy round these parts, here are a few notes from the last month or so. Natural variability – Energy budget Our paper on natural variability in the Earth’s energy budget got a nice write-up from John Abraham in the Guardian. Mat Collins happened to be passing, and took a nice picture of […]

A brief observation on statistical significance

This has been on my mind for a while. I think the observation is best summed up as: If somebody asks if something is statistically significant, they probably don’t know what it means. I don’t mean to offend anyone, and I can think of plenty of counter examples*, but this is borne out of long […]

On the value of observations

I’m pretty happy that our paper on finding the potential value of observations for constraining climate models, was published today in Geoscientific Model Development. I posted about the discussion paper here, and you can download a presentation describing the work here. The paper demonstrates a method for working out how useful a new observation might […]