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Record low ozone values over Canada in early 1993
Author(s) -
Kerr J. B.,
Wardle D. I.,
Tarasick D. W.
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl01927
Subject(s) - stratosphere , ozone , volcano , environmental science , atmospheric sciences , latitude , low latitude , climatology , ozone depletion , altitude (triangle) , meteorology , geology , geography , geodesy , geometry , mathematics , seismology
Measurements of ozone made over Canada during the first four months of 1993 indicate that total ozone has been about 11 to 17% below normal. These low values were recorded, without exception, at all nine of the Canadian mid‐latitude ground‐based monitoring sites. Record low averages for the period from January to April were measured at three of the four mid‐latitude stations where measurements have been made since the 1960’s. Comparison of January to April, 1993 ozonesonde profile measurements with those from earlier years indicates that the ozone deficit is in the lower stratosphere between 40 and 200 mb, the same altitudes where aerosols from the Mount Pinatubo volcanic eruption have been observed. The peak loss is 30% at 100 mb (16 Km).