Dependence of valley cold air pools on valley scale

Cold air pools which form in valley bottoms on clear, calm nights intensify diurnal temperature minima and induce strong stability, with the possibility of dangerous build-up of pollutants when cold air pools persist for a long time. Cold air pools within small-scale hills exhibit different dynamical behaviour to those in large mountain-walled valleys. The dynamics of cold air pools, and their effect on cold pool morphology and diurnal cycle, are investigated as a function of atmospheric conditions and changing scale between these limits.