DYAMOND 2nd phase - the winter - experimental protocol

In the initial phase of the DYAMOND (DYnamics of the Atmospheric general circu- lation Modeled On Non-hydrostatic Domains) project nine models were run successfully at storm resolving scales for 40 days and nights from the 1st August 2016 (Stevens et al., 2019). Here two additional experiments are proposed, which will complement the boreal summer period with a winter period. In the second phase, the experiment will be conducted with both, atmosphere only and (if possible) with coupled atmosphere-ocean models. The modelling groups of the first phase present at the ESIWACE Hackathon in Mainz in June 2019 (NICAM, ICON, GEOS, MPAS, IFS, SAM and FV3) agreed on a winter simulation as common area of interest. Only a sub-group is currently able to run the coupled experiments at this stage (NICAM and IFS). Other groups are actively working towards a coupled setup of their models (SAM, GEOS, and ICON) and hope to be able to contribute by the time of the experiment. The project remains open to other groups to participate and closely follows the protocol of the first DYAMOND runs. The DYAMOND project is a framework for the intercomparison of an emerging class of atmospheric circulation models, that, through their resolution of the major modes of atmospheric heat transport, endeavor to represent the most important scales of the full three-dimensional fluid dynamics of the atmospheric circulation. Phase 0 of DYAMOND will be complemented by a boreal winter period and coupled models with the goal to: (i) compare the representation of the Madden-Julian-Oscillation in this class of models; (ii) investigate the effect of the atmosphere-ocean coupling at storm and ocean- eddy resolving scales on convection and the general circulation; and (iii) link to the EUREC4A campaign, which targets meso-scale convection patterns and the coupling to the upper ocean processes.


Geometric height of vertical model levels used by NICAM