Convective circulation patterns associated with sea breezes are caused by what airflow?

• A. Warm air rising over land
• B. Cool, dense moving air moving inland from over the water
• C. Turbulent mixing over water
• D. High altitude jet stream

Answer: (B)

Sea-breeze circulation is driven by the onshore flow of cooler, denser air moving from over the water toward the land at the surface. During the day, the land heats up faster than the sea, so air over land becomes buoyant and rises, lowering surface pressure over the coast. To replace this rising air, cooler air from the sea moves inshore at low levels, and as it moves inland it can rise over the land to sustain convection. This onshore movement of cool air is the key airflow creating the coastal convective pattern. The jet stream and deep mixing over water aren’t responsible for this local daytime circulation, and while warm air rising over land is part of the overall process, the driving airflow by itself is the cool, dense air moving from sea to land.