Fodder for skeptics

Climate Feedback: The climate machine

The Hadley Centre is working on a more complicated model of the Earth for the next round of future climate predictions.

The only problem is, climate skeptics/deniers are bound to leap onto this:

The scientists – such as Jones – who have developed HADGEM2-ES hope that by representing the earth system in greater complexity they will be to simulate the present-day climate with greater realism. This should, in theory, lead to more realistic projections for the future, but many of the climate modellers I spoke to were keen to point out that simulating the climate with more complex models may well lead to greater uncertainty about what the future holds. That’s because including sources of large feedbacks – such as forests that can expand or die or tundra that can release vast amounts of methane – adds a whole new suite of factors to which the climate can respond.

So, it’s quite likely that the next IPCC report will have much larger error bars on its estimates of future temperature or precipitation, compared with AR4. Climatologist Jim Hurrell of the National Center for Atmospheric Research (NCAR) in Boulder, Colorado, who is heading up development of the NCAR Earth-system model, had this to say:

“It's very likely that the generation of models that will be assessed for the next IPCC report will have a wider spread of possible climate outcomes as we move into the future".

No one ever said climate science was easy...