Define inversion and its impact on fog and air quality.

Study for the METRO (Meteorology) – VT-10 Test. Enhance your knowledge with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam today!

Multiple Choice

Define inversion and its impact on fog and air quality.

An inversion is a layer where temperature increases with height, creating stable stratification that acts like a lid on vertical motion. Because rising air is cooler than the air above it, parcels have trouble buoyantly rising, so vertical mixing is greatly suppressed. This keeps surface air and whatever pollutants or moisture it contains trapped near the ground, which can raise pollution concentrations and promote fog formation when relative humidity is high. In clear, calm conditions, radiational cooling at the surface often strengthens inversions, making both poor air quality and persistent fog more likely. The other descriptions don’t fit: a temperature decrease with height describes the usual, well-mixed atmosphere that permits mixing; a constant temperature with height implies neutral or weak stability and isn’t an inversion; and a layer of fog is a result of conditions under an inversion, not its definition.

An inversion is a layer where temperature increases with height, creating stable stratification that acts like a lid on vertical motion. Because rising air is cooler than the air above it, parcels have trouble buoyantly rising, so vertical mixing is greatly suppressed. This keeps surface air and whatever pollutants or moisture it contains trapped near the ground, which can raise pollution concentrations and promote fog formation when relative humidity is high. In clear, calm conditions, radiational cooling at the surface often strengthens inversions, making both poor air quality and persistent fog more likely.

The other descriptions don’t fit: a temperature decrease with height describes the usual, well-mixed atmosphere that permits mixing; a constant temperature with height implies neutral or weak stability and isn’t an inversion; and a layer of fog is a result of conditions under an inversion, not its definition.

More practice questions