FEATURES OF NORTHERN SPRING ATMOSPHERIC OZONE VARIATION AND ITS EFFECT ON ATMOSPHERIC TEMPERATURE AND CIRCULATION

Pronounced change has been found in the trend of total ozone in an atmosphere column at extra-tropics north of 40°N around 1987, which abruptly reduced for much of the studied area, accompanied by the sudden rise (drop) in the troposphere (stratospheric) mean temperature and in the 300 hPa (30 hPa) height. Meanwhile, unexpected increase of total O₃ occurred over the northern North Atlantic and Huson Bay, accompanied by the drop (rise) of the tropospheric (stratospheric) mean temperature and geopotential height at 300 hPa (30 hPa). The unexpected reduction of 10-30 DU ozone in NE China was associated with the abrupt increase (decrease) of 1-2 ℃ in the troposphere (stratosphere) mean temperature there over. The variation in the trend of the atmospheric temperature and circulation was mainly attributed to the total ozone the atmosphere.