Learn: Global Atmospheric Circulation

Welcome!Today we'll explore global atmospheric circulation, which affects weather patterns around the world. It's a fascinating topic that explains why climates vary across Earth.

What is Global Atmospheric Circulation?Global atmospheric circulation is the large-scale movement of air that redistributes heat across the Earth. It is driven by the uneven heating of the planet by the Sun, which causes differences in air pressure.This system is key to understanding weather patterns and climate zones, such as deserts and rainforests.

Pressure BeltsEarth's atmosphere is divided into pressure belts, which are areas of high or low pressure. These belts are created by the movement of air in response to heating at the equator and cooling at the poles.High-pressure areas are typically dry, while low-pressure areas experience more rainfall.

Cells in Global CirculationGlobal atmospheric circulation is divided into three main cells in each hemisphere: Hadley Cell, Ferrel Cell, and Polar Cell.These cells move air in specific patterns, creating the winds and weather systems we experience.

The Role of WindsWinds are created by the movement of air between high-pressure and low-pressure areas. The Trade Winds and Westerlies are examples of winds influenced by atmospheric circulation.Trade Winds blow towards the equator, while Westerlies blow from west to east in the mid-latitudes.

Climate ZonesGlobal atmospheric circulation creates distinct climate zones, such as tropical rainforests near the equator (low pressure and rising air) and deserts around 30° latitude (high pressure and descending air).

Review Time!Great work! You've learned about global atmospheric circulation, pressure belts, cells, winds, and climate zones. Now let's test your understanding.