A looming Arctic ozone hole?

Article Abstract:

New research suggests the chemical processes now understood to have caused the Antarctic ozone hole may also threaten the Arctic and, in turn, endanger the heavily populated Northern Hemisphere. High levels of dynamic Arctic atmospheric activity have checked these processes, but evidence of doubling carbon dioxide (CO2) concentrations may change this. The formation of polar stratospheric clouds (PSCs), the first stage of these processes, depends on the temperature of the polar night. Increased CO2 levels may lower stratospheric temperatures and encourage PSC formation.

Forecasts and trends, Greenhouse effect, Arctic Regions

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A bad winter for Arctic ozone

Article Abstract:

Large ozone loss in the Arctic during the winter and early spring of 1995-96 is reported by Muller and colleagues and Rex and colleagues. The low ozone concentrations are believed to be due to the Arctic stratosphere remaining cold for longer than average over the past few winters. This means that nitrogen remains as nitric acid (HNO) will into the sunlit period of late winter and early spring, and the temporary lack of nitrogen leads to more ozone removal.

Environmental aspects, Arctic regions

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Prolonged stratospheric ozone loss in the 1995-96 Arctic winter

Article Abstract:

Extensive ozone depletion due to heterogenous reactions on polar stratospheric clouds (PSCs) occurs in the Arctic and Antarctic lower stratosphere. The ozone loss over the Arctic region during the unusually cold 1995-96 Arctic winter, was the highest recorded. The continued loss could be due to the removal of the nitrogen species that slow down the rate of chemical ozone depletion.

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