ozone hole

American  

noun

1. any part of the ozone layer that has become depleted by atmospheric pollution, resulting in excess ultraviolet radiation passing through the atmosphere.

---

ozone hole Scientific  

1. A severe depletion of ozone in a region of the ozone layer, particularly over Antarctica and over the Arctic. The depletion is caused by the destruction of ozone by CFCs and by other compounds, such as carbon tetrachloride (CCl ₄) and carbon tetrafluoride (CF ₄). The amount of ozone in ozone holes is about 55 to 60 percent of the normal concentration in the ozone layer. Although the full effect of increased ozone depletion is not yet known, the amount of ultraviolet radiation the Earth receives is greatly increased by ozone depletion, creating a heightened risk of skin cancers and likely contributing to global warming.

2. See Note at ozone

---

ozone hole Cultural  

1. A depletion of ozone that occurs over Antarctica in the winter. The ozone returns to normal levels in the summer, and the amount of depletion varies from year to year. The hole is thought to be caused by a combination of the peculiarities of atmospheric circulation (see atmosphere) near the South Pole and chemical reactions involving chlorofluorocarbons in the atmosphere and ice crystals in clouds.

---

Etymology

Origin of ozone hole

First recorded in 1985–90

Example Sentences

Climate change biologist Prof Sharon Robinson told BBC News: "When I tell people I work on the ozone hole, they go: 'oh, isn't that better now?'"

From BBC • Apr. 26, 2024

Lead author Hannah Kessenich, PhD candidate in the Department of Physics, says they found there is much less ozone in the centre of the ozone hole compared to 19 years ago.

From Science Daily • Nov. 21, 2023

With last year’s undersea volcano injecting massive amounts of water high into the atmosphere, scientists were bracing for a big Antarctica ozone hole this fall.

From Seattle Times • Nov. 1, 2023

What we learned from tackling acid rain and the ozone hole can be applied to tackling climate change overall.

From Scientific American • Oct. 25, 2023

The ozone hole of over- information broke the protective bubble of literacy.

From The Civilization of Illiteracy by Nadin, Mihai