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Multi-Scale Chemistry Modeling (MUSICA)

The Atmospheric Chemistry Observations and Modeling (ACOM) Laboratory at NCAR together with the atmospheric chemistry community is developing a new community modeling infrastructure. MUSICA – the Multi-Scale Infrastructure for Chemistry and Aerosols – will become a computationally feasible global modeling framework that allows for the simulation of large-scale atmospheric phenomena, while still resolving chemistry at emission and exposure relevant scales (down to ~4 km within the next 5 years). MUSICA will eventually replace and extend the current separate community chemistry modeling efforts at NCAR (e.g. WACCM, CAM-Chem, WRF-Chem), paralleling other activities at NCAR to streamline and unify model development.

The MUSICA Kick-Off meeting was held at NCAR from 21-22 May, 2019. Presentations from this meeting are available from the meeting website. 


MUSICA Version 0 represents a regionally refined version of the CAM-chem global chemistry climate model. This model development takes advantage of recent advancements in CAM that uses the Spectral Element dynamical core (which is an unstructured grid mesh based on a cubed sphere) which now allows for regional refinement (CAM SE RR). Initial MUSICAv0 simulations use a grid mesh with global horizontal resolution of 1˚ that refines to 0.125˚ (~14km) over the conterminous U.S. (CONUS). The animation compares hourly surface ozone for August 2013 simulated at uniform global 1˚ horizontal resolution (top) with a MUSICAv0 global 1˚ simulation that refines to 14 km resolution over CONUS (bottom).

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ACOM | Atmospheric Chemistry Observations & Modeling