Overview

The stratosphere is characterized by the presence of the ozone layer, which absorbs and blocks the majority of the sun's harmful ultraviolet radiation. This layer plays a crucial role in protecting life on Earth from the harmful effects of UV radiation.

Composition

The composition of the stratosphere is primarily made up of nitrogen (about 78%) and oxygen (about 21%). In addition, it contains a higher concentration of ozone compared to the troposphere.

Temperature Profile

The temperature in the stratosphere generally increases with altitude. This is due to the absorption of UV radiation by the ozone layer, which leads to the heating of the surrounding air.

Role in Climate

The stratosphere plays a role in regulating the Earth's climate by influencing the distribution of heat in the atmosphere. It also affects the movement of air masses and the formation of weather patterns.

Human Impact

Human activities, such as the release of chlorofluorocarbons (CFCs) and other ozone-depleting substances, have led to the thinning of the ozone layer in the stratosphere. This has resulted in concerns about increased UV radiation reaching the Earth's surface, which can have detrimental effects on human health and the environment.

Study Guide Questions

1. What is the significance of the ozone layer in the stratosphere?
2. How does the temperature change with altitude in the stratosphere?
3. Discuss the impact of human activities on the stratosphere.
4. Explain the role of the stratosphere in regulating the Earth's climate.
5. Compare the composition of the stratosphere with that of the troposphere.

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