Question

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

05 Apr 2025
Answer :
Word Count : 1228

The Earth's atmosphere is a complex and dynamic system that plays a critical role in regulating the planet's climate. It is composed of various layers with different characteristics and properties, and it is responsible for the distribution of energy, which drives weather patterns and global climate. To understand the processes governing climate change and weather phenomena, we first need to look at the vertical structure and composition of the atmosphere, followed by an exploration of the global energy budget, which explains how energy is absorbed, stored, and redistributed within the Earth's system.

Vertical Structure and Composition of the Atmosphere

The atmosphere is divided into several layers based on temperature variations, which create distinct zones with differing physical properties. These layers are as follows:

  1. Troposphere: The troposphere is the lowest layer of the atmosphere, extending from the Earth's surface to about 8-15 kilometers (5-9 miles) in altitude, depending on the latitude. It contains about 75% of the atmosphere's mass and is where weather phenomena occur. The temperature decreases with altitude in this layer, and it is the region where clouds, winds, and most weather patterns are formed. The troposphere is also where most of the water vapor is located, which plays a key role in the Earth's climate system.

  2. Stratosphere: Above the troposphere lies the stratosphere, which extends from around 15 kilometers to about 50 kilometers (9 to 31 miles). In contrast to the troposphere, the temperature in the stratosphere increases with altitude, a phenomenon caused by the absorption of ultraviolet (UV) radiation by ozone molecules. The stratosphere contains the ozone layer, which absorbs and scatters solar ultraviolet radiation, protecting life on Earth from harmful UV rays. The stability of the stratosphere prevents weather disturbances from reaching this layer.

  3. Mesosphere: The mesosphere is situated above the stratosphere, extending from 50 kilometers to _________ _____ ____ _____ __________ ____ _____ ________.
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