Geophysical Research Letters

Relation of Antarctic 100 mb temperature and total ozone to equatorial QBO, equatorial SST, and sunspot number, 1958-87

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Abstract

Year-to-year changes in springtime (September-October-November or SON) values of Antarctic 100 mb temperature and total ozone have been compared with each other and with year-to-year changes in SON values of equatorial 50 mb temperature (reflecting the quasi-biennial oscillation or QBO) and sea-surface temperature (SST) in eastern equatorial Pacific (reflecting El Nino). During the 30-year period 1958-87, there has been a significant (at the 5% level) correlation of 0.73 between year-to-year changes in SON values of Antarctic 100 mb temperature and total ozone, as well as a significant correlation of −0.64 between year-to-year changes in SON values of Antarctic 100 mb temperature and equatorial 50 mb temperature. There has been little correlation (−0.18) between year-to-year changes in Antarctic 100 mb temperature and SST in eastern equatorial Pacific. However, year-to-year changes in Antarctic total ozone have been almost equally related to year-to-year changes in equatorial 50 mb temperature and equatorial SST (respective correlations of −0.44 and −0.42), with a significant correlation of −0.60 if the latter two quantities are considered jointly (multiple correlation). Unlike the Arctic in winter, there is no evidence of an increase in springtime values of Antarctic 100 mb temperature (and total ozone) with increase in sunspot number when the equatorial QBO is in the west-wind phase, but there is provisional evidence of such an increase in the east-wind phase.

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