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Unusually low total ozone was observed over the south-central United States during November 1994. The region of low ozone was associated with a persistent subtropical jet stream over the southeastern United States, which was accompanied by significant above-normal temperatures over the eastern two-thirds of the country [NOAA Climate Analysis Center, 1994]. Although the ozone is apparently the lowest reported over the United States since satellite observations were begun, ultraviolet radiation measured in Texas was lower than during October because of the reduced Sun angle during November and, on some days, overcast skies. The low ozone was observed by two satellite instruments—Meteor-3 Total Ozone Mapping Spectrometer (TOMS) and the Tiros Operational Vertical Sounder (TOVS)—and by ground-based instruments in Texas (Microprocessor Total Ozone Portable Spectrometers (MicroTOPS)) and in North Carolina, Georgia, and Washington, D.C. (Brewer scanning spectrophotometers). |
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