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Question

Difficulty: EasyClimate Change, Global Warming and Ozone Layer Depletion

Which unit of measurement is standardly used to express the total column concentration or abundance of ozone in Earth's atmosphere?

  1. Dobson Unit (DUDU)Answer
  2. B
    Decibel (dBdB)
  3. C
    Becquerel (BqBq)
  4. D
    Part per Billion (ppbppb)

Answer

The Dobson Unit (DUDU) is the standard unit for measuring atmospheric column ozone abundance.
The Dobson Unit (DUDU) is internationally recognized as the standard metric for total column ozone. An average atmospheric ozone layer thickness is approximately 300 DU300\text{ DU}, which equates to a compressed pure ozone layer of 3 mm3\text{ mm} at STPSTP.

Step-by-Step Solution

1
Identify the physical quantity being measured.
The total amount of ozone present in a vertical column of the atmosphere.
The question asks for the specific unit representing column ozone abundance.
2
Recall the standard meteorological and environmental metric for column ozone.
One Dobson Unit (1 DU1\text{ DU}) corresponds to a layer of pure ozone 0.01 mm0.01\text{ mm} thick at standard temperature and pressure (STPSTP).
This metric standardizes measurements from ground-based spectrophotometers and satellite sensors.

Key Concept

Measurement of Total Atmospheric Column Ozone
Estimated Time:45s
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Topics

Climate Change, Global Warming and Ozone Layer Depletion