Which of the following micro-meteorological phenomena occurs when a layer of dense, cold air is trapped near the ground beneath a layer of warmer air aloft, effectively suppressing vertical air mixing and trapping urban air pollutants near the surface?

💡 Solution & Explanation

A radiation temperature inversion occurs on clear, calm nights when rapid terrestrial longwave radiation cools the ground surface, which in turn chills the air immediately above it while air aloft remains warmer. This atmospheric stratification prevents buoyant uplift and vertical dispersion of particulate matter, often creating smog conditions in valleys and cities. Adiabatic expansion cools rising air packets, while katabatic winds are drainage flows down mountain slopes. Surface inversions break up rapidly after sunrise as solar radiation heats the ground.