Discussion
Convective precipitation in a coarse resolution model is usually
Answer: A
Correct answer: parameterised rather than resolved explicitly
A convective cell is a few kilometres across, well below the grid spacing of a coarse model, so the model cannot represent the updraught directly. A convection scheme instead estimates how much precipitation and heating the sub-grid convection would produce from the resolved temperature and humidity profile. Those schemes are a principal source of uncertainty, which is why convection-permitting models at grid spacings of a kilometre or two are used where the resources allow.
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