Category Climate

A pairs density ploy of the JULES inputs that pass level 1 constraints.

Visualising input spaces using emulators

In a previous post, I looked at some of the ways we could visualise the input space of climate models, when they are constrained to produce behaviour that looks something like the real world. I used parallel co-ordinates plots and pairs plots to visualise the high (32) dimensional input space of the JULES land surface […]

Visualising weird input spaces

I’ve been working on a fairly large (~500 member) perturbed-parameter ensemble of the land surface model JULES. The model simulates the global historical land surface, and each ensemble member is forced by the same global reanalysis on the HadGEM2 grid scale. Differences in the model output are therefore caused by the different values of the […]

More on surviving social media

I updated this talk [download slides] from last summer (time flies!), offering some personal thoughts on surviving a sometimes-hostile social media environment. [The sound gets better after I decide to hold the tiny mic rather than have it stuck in my shirt.] I was talking to my peers this time, so the mood is somewhat […]

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 […]

Choosing your next design point

You can use the R package DiceOptim to choose the next point to run your expensive simulator. Here’s a gif of function EGO.nsteps() in action, choosing one point at a time, with an initial design of three points.   It doesn’t behave in exactly the way I expected, putting lots of points in that well […]

Behind the scenes at the new podcast from the Met Office

I’m pretty excited to be part of the regular team for the new Met Office podcast, Mostly Weather. We’re trying to capture a fun, relaxed and hopefully interesting discussion of science, history and little-known facts about weather and climate. I’d like to think that we hit the nerdy-but-accessible sweet spot. We’ve a couple of episodes […]

The best climate science journals (update)

What are the best/most influential/most read/most overrated journals in climate science? This turns out to be quite hard to judge, as climate science these days can seemingly include everything from economics, to biochemistry, and back to psychology. Google Scholar has a list of what it thinks are the best journals in atmospheric science. Here is […]