MICM solves a NOx–O3 mechanism independently in every cell of a global surface grid. A prescribed, non-divergent wind field then transports the species between the cells. Choose a flow pattern to see how the circulation shapes the plumes. All of the work happens in WebAssembly in this browser tab.
Initializing MUSICA WASM module…
Every pattern comes from a streamfunction on the cell corners. The discrete wind field is therefore divergence free, and the transport conserves mass.
The first order scheme is much more diffusive. Switch between them to see how the numerical method changes the sharpness of the plumes.
NO is emitted in the cells that contain the labelled cities.
| Model time | — |
| Grid cells solved per step | — |
| Wall time per step | — |
| Chemistry / transport split | — |
| Peak wind speed | — |
| Advection substeps per step | — |
| Displayed field min / mean / max | — |
| Transport mass drift | — |
| Solver state | — |
The mass drift measures only the advection operator. Chemistry and emissions change the NOx burden on purpose, so they are excluded from that check.