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 draft protocol for the intercomparison is available and in open peer review as:
Goldblatt, C. and Kavenagh, L.: The Palaeoclimate and Terrestrial Exoplanet Radiative Transfer Model Intercomparison Project (PALAEOTRIP): experimental design and protocols, Geosci. Model Dev. Discuss., doi:10.5194/gmd-2017-24, in review, 2017.

We would invite all scientists and groups involved in deep palaeoclimate and terrestrial exoplanet modelling to contribute model runs through 2017. If you're interested in contributing to the project please sign up here or get in touch with us.