Question

data source: united states national oceanic and atmospheric administration/earth system research laboratory, physical sciences division
based on the humidity measurements, which outlined area better fits the definition of an air mass?

Explanation:

Step1: Recall air mass definition

An air mass is a large body of air with relatively uniform humidity (and temperature) over a region.

Step2: Analyze humidity in areas A and B

• Area A: The color (purple) corresponds to low specific humidity (0 - 6 g/kg approx), and the color is relatively uniform across the oval, meaning humidity is consistent.
• Area B: The colors (mix of green, white, purple) show a wider range of specific humidity values (from low to high), so humidity is less uniform.

Step3: Determine the better fit

Since an air mass needs uniform humidity, Area A has more uniform humidity than Area B.

Answer:

Area A (the oval labeled A)