Question

Dobson units are used to measure thickness of

• A. Troposphere
• B. CFCs
• C. Stratosphere
• D. Ozone

Answer 1

The Correct Option is D

The given question asks us to identify what Dobson units are used to measure from the given options: Troposphere, CFCs, Stratosphere, and Ozone. The correct answer is Ozone. Let's delve into the explanation:

Understanding Dobson Units:

Dobson units are a measure used to quantify the amount of ozone in the Earth's atmosphere. Named after Dr. Gordon Dobson, these units describe the thickness of the ozone layer in a column of air above a specific point on the Earth’s surface.

One Dobson Unit (DU) is defined as 0.01 millimeters of ozone at standard temperature and pressure. This means if all the ozone in a column were compressed to 0°C and 101.3 kPa (1 atm), one Dobson Unit would correspond to a layer of ozone 0.01 mm thick.

Explanation of Options:

• Troposphere: The troposphere is the lowest layer of Earth's atmosphere and is not measured using Dobson units.
• CFCs: Chlorofluorocarbons (CFCs) are chemical compounds that deplete ozone but are not quantified in Dobson units.
• Stratosphere: While the ozone layer is located in the stratosphere, Dobson units specifically measure ozone, not the stratosphere's thickness.
• Ozone: This is the correct answer, as Dobson units directly measure the thickness of the ozone layer.

Conclusion:

The correct answer is:

Ozone

Dobson Units are specifically designed to measure the concentration of ozone in the Earth's stratosphere. Understanding the use of Dobson units is crucial for assessing the health and depletion of the ozone layer.