In July, where is the 300 mb tropical high-pressure belt typically located?

• A. Near the equator
• B. Near 20N
• C. Near 30N
• D. Near 10N

Answer: (B)

The 300 mb tropical high-pressure belt is typically located near 20 degrees North latitude during July. This region corresponds with the subtropical high-pressure systems, or the subtropical ridges, which are generally centered around this latitude in both the Northern and Southern Hemispheres. These high-pressure systems are a result of intense solar heating in the tropics, which causes air to rise and subsequently flow outward at higher altitudes. As the air moves toward the poles, it cools and sinks, creating an area of high pressure at around 20 degrees latitude. This phenomenon is closely tied to the Hadley cell circulation, which dominates tropical weather patterns.

The other latitudes mentioned do not accurately reflect the typical positioning of the 300 mb high-pressure belt during the summer months. For example, near the equator, one would find low pressure due to ascending air in the Intertropical Convergence Zone (ITCZ). Near 30 degrees, while there are subtropical highs, they are more prominent in the surface pressure patterns than at 300 mb. Additionally, 10 degrees North is also within the ITCZ zone, where the pressure is lower rather than high. Hence, the most accurate description of where the 300 mb tropical high-pressure belt