Atmospheric science — “ozone hole”: What does the term “ozone hole” refer to? Context: Seasonal, regional thinning of stratospheric ozone concentration (not a literal hole) most pronounced over Antarctica. Choose the correct description.
General Knowledge
Biology
Difficulty: Easy
Choose an option
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AA literal empty space in the atmosphere
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BSeasonal thinning/depletion of stratospheric ozone, especially over Antarctica
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CPermanent absence of ozone throughout the stratosphere
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DA gap in the troposphere caused by storms
Answer
Correct Answer: Seasonal thinning/depletion of stratospheric ozone, especially over Antarctica
Explanation
Concept / ApproachThe “ozone hole” describes markedly reduced ozone concentrations in the stratosphere during spring over polar regions (especially Antarctica), driven by catalytic destruction involving halogen radicals (from CFCs/halons) on polar stratospheric clouds.
ClarificationIt is not a physical hole; it is a region of thinning measured as decreased total column ozone (Dobson Units).
Final AnswerSeasonal stratospheric ozone depletion (not a literal hole).