PALAEOTRIP, the Palaeoclimate and terrestrial Exoplanet Radiative Transfer Intercomparison Project,  is a model intercomparison project (MIP) to address the radiative transfer codes used for deep palaeoclimate and Earth-like exoplanets. Our aim is to test a large number of fast radiation codes, both GCM and bespoke, against line-by-line models for a wide range of conditions applicable to these atmospheres.

The protocol for the intercomparison is now published and available as:
C. Goldblatt, L. Kavanagh, and M. Dewey, The Palaeoclimate and Terrestrial Exoplanet Radiative Transfer Model Intercomparison Project (PALAEOTRIP): experimental design and protocols, Geosci. Model Dev., 10, 3931–3940, 2017, https://doi.org/10.5194/gmd-10-3931-2017

We invite all scientists and groups involved in deep palaeoclimate and terrestrial exoplanet modelling to contribute model runs through spring 2018. If you're interested in contributing to the project please get in touch with us.