Discussion
Consider the following statements about model resolution.
1. Increasing resolution raises computational cost sharply.
2. Higher resolution allows some processes to be resolved rather than parametrised.
3. Higher resolution automatically gives a better simulation.
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: halving the grid spacing multiplies the cost by roughly sixteen, because the three space dimensions and the time step all refine together, and finer grids allow processes such as deep convection to be resolved rather than parametrised. Statement 3 is too strong - a model whose parametrisations were tuned at coarse resolution can perform *worse* when refined, until they are retuned or replaced.
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