Explain the vertical structure and composition of atmosphere. Explain the global energy budget with a suitable diagram.

The Earth's atmosphere is a layer of gases that surrounds the planet and is held in place by gravity. It plays a crucial role in regulating temperature, supporting life, and protecting Earth from harmful solar radiation. The atmosphere is composed of several layers, each with distinct characteristics such as temperature, composition, and function. Understanding the structure of the atmosphere is essential for comprehending global climate change, as changes in the composition and behavior of the atmosphere directly impact global temperature and weather patterns.

Vertical Structure of the Atmosphere

The Earth's atmosphere can be divided into five distinct layers based on temperature changes as altitude increases. These layers are:

1. Troposphere:

   • The troposphere is the lowest layer of the atmosphere, extending from Earth's surface to about 8-15 km (5-9 miles) high. The exact altitude varies depending on geographic location, being thicker at the equator and thinner at the poles.

   • It is primarily composed of nitrogen (78%) and oxygen (21%), with small amounts of other gases such as carbon dioxide, water vapor, and trace gases.

   • The troposphere is where weather phenomena occur, including clouds, storms, and precipitation. This is also where most of the Earth's water vapor is found, playing a significant role in regulating the climate.

   • The temperature decreases with altitude in this layer, and the average temperature at the top of the troposphere is about -50°C.

   • The boundary between the troposphere and the next layer, the stratosphere, is called the tropopause.

2. Stratosphere:

   • Located above the troposphere, the stratosphere extends from about 15 km to 50 km (9 to 31 miles) above the Earth's surface.

   • This layer contains the ozone layer, which absorbs and scatters ultraviolet solar radiation, providing protection for life on Earth.

   • Unlike the troposphere, the temperature in the stratosphere increases with altitude. This is due to the absorption of solar radiation by the ozone molecules, which causes them to warm up.

   • The boundary between the stratosphere and the next layer, the mesosphere, is called the stratopause.

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