亚印太交汇区低纬上空不同层次大气臭氧的时空变化分析

Characteristics of temporal-spatial vertical distribution of atmospheric ozone over the low-latitude region of the joining area of Asia and Indian-Pacific Ocean

利用ECMWF 195709～200208共45 a的多层臭氧质量混合比月平均资料,详细分析了亚印太交汇区(AIPO)低纬地带上空平流层、对流层各层次上臭氧浓度的分布特征.结果表明:①区域上空对流层、平流层及臭氧总量大尺度特征均显著,纬度带分布特征明显;②对流层和平流层臭氧各个季节变化趋势相反,平流层臭氧和臭氧总量各个季节变化趋势一致;同一层次夏季臭氧浓度变化趋势与其他3个季节变化趋势相反;③区域上空20～3 hPa是臭氧浓度的高值区,50～30 hPa臭氧平均变化幅度最大;④对流层臭氧距平变化在整个高度上较为一致,正、负距平随季节绕赤道做南、北半球摆动,且存在季节性突变;⑤赤道上空有明显从平流层上层随季节逐渐往较低层传播的臭氧正负距平现象.

Based on the multi-layered ozone mass mixing ratio monthly mean data derived from ECMWF during the periods of 195709—200208,the distribution characteristics of stratosphere and troposphere atmospheric ozone concentration at all levels over the low-latitude region of the joining area of Asia and Indian-Pacific Ocean（AIPO）,have been analyzed in detail.The results showed that：①The tropospheric,stratospheric and total ozone over the region all reflect significant large-scale features with obvious latitude-belt distribution characteristic;② The variation trends of tropospheric and stratospheric ozone in all seasons are reverse,while stratospheric and total ozone are consistent.The ozone trend in summer is contrary to other three seasons at the same level;③The vertical variation range of the high ozone concentration and the averaged ozone maximum are respectively exist in the 3—20hPa and 50—30hPa over the equator region;④ At the different levels,the anomaly change of tropospheric ozone is consistent.And the positive and negative anomalies demonstrate a southern-northern hemisphere oscillation and abruptness with the season;⑤With seasons changing,there is an obvious downward propagation of the positive and negative ozone anomalies in the upper stratosphere over the equatorial latitude.