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Antarctic total ozone in 1958.

Science (New York, N.Y.)

|April 22, 1994

Summary

This summary is machine-generated.

The Antarctic ozone hole, caused by chlorine radicals, was not present in 1958. Data from Dumont d'Urville station in 1958 is inconsistent with other ozone measurements and scientific understanding.

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Area of Science:

Atmospheric chemistry
Ozone layer research
Antarctic science

Background:

The Antarctic ozone hole is an annual phenomenon caused by catalytic ozone destruction by chlorine radicals.
It forms in August, peaks in October, and dissipates by December.

Purpose of the Study:

To evaluate the credibility of 1958 ozone measurements from Dumont d'Urville.
To determine if an ozone hole existed in the Antarctic in 1958.

Main Methods:

Analysis of spectrographic plates from Dumont d'Urville station, 1958.
Comparison of Dumont plate data with 1958 Dobson spectrophotometer measurements.
Assessment of data against contemporary Antarctic observations and meteorological/theoretical models.

Main Results:

Dumont d'Urville spectrographic plate data from 1958 show extreme low total ozone values.
These 1958 Dumont plate data are inconsistent with 1958 Dobson spectrophotometer measurements.
The 1958 Dumont data contradict present-day Antarctic observations and established atmospheric models.

Conclusions:

There is no credible evidence to support the existence of an Antarctic ozone hole in 1958.
The 1958 Dumont d'Urville spectrographic data are unreliable for assessing ozone hole presence.