Utilisation d'un code Monte-Carlo spectralement raffiné prenant en compte le recouvrement des nuages pour estimer le refroidissement de la Terre intégré sur une période climatique

The Earth’s radiative cooling is a key driver of climate and due to the complexity of the radia-tive transfer processes, current estimates of this cooling require the development and use of asuite of radiative transfer models of decreasing accuracy when moving from local, instantaneousestimates to estimates over the whole globe and for long periods (decades). Here we addresshow recent advances in non-linear Monte Carlo methods allow a paradigm shift by producing in a single step and at a very low computational cost a completely unbiased estimate of theEarth’s infrared cooling to space on a global scale and for years, while including the most re-fined spectroscopic models of molecular gas energy transitions. We also show it is possible totake exponential-random cloud overlap as well as the vertical subgrid heterogeneity of the cloudfraction into account directly during the Monte Carlo computations. The use of Monte-Carloallows to have access to some interesting diagnostics, as the emission height and the emissionagent. For illustration, we will show the emission altitudes of each atmospheric components andhow these altitudes shift when the greenhouse gas (CO2, H2O, etc.) concentration varies