A Study of Chemical Processes Leading to Ozone Losses in the Midlatitude Stratosphere

自1995年7月以来，在日本北海道陆别（43.5 ° N，143.8 ° E）用傅里叶变换光谱仪观测了平流层痕量组分的垂直柱量。使用的光谱仪是Bruker 120 M，最高光谱分辨率为0.0035 cm 2<-1>。在500 ~ 4400 cm ~ 2的太阳光谱<-1>范围内，观测到平流层中HCl、HF、ClONO_2和O_3的柱量，在日本观测到的O_3的长期减少以札幌（43 ° N）最大。此外，与皮纳图博火山爆发相关的O_3变化在札幌比在低纬度地区大得多[Kondo等人，1995年]。偶尔，涡旋内的空气质量在春季被输送到陆别上空。由于陆别的纬度靠近札幌，对这些物种的测量将使我们更好地了解在43 ° N处观察到的O_3大幅变化的机制。自1995年7月以来一直观察到HCl和HF垂直柱量的时间变化。这两个物种都表现出从秋季到冬季的季节性变化。研究发现，这两个物种的日变化具有很好的相关性。对流层顶高度的变化也与这些物种的变化有很好的相关性。我们计划获得一整年期间观测到的HCl、HF、ClONO_2和O_3的柱量，并根据化学和传输过程对这些值进行分析。1991年至1994年日本上空43 ° N和36 ° N处平流层臭氧变化，地球物理学。Res.Lett，22，3223 - 3226，1995.

Vertical column amounts of the stratospheric trace species have been observed using a Fourier transform spectrometer at Rikubetsu (43.5ﾟN,143.8ﾟE), Hokkaido, Japan since July, 1995. The spectrometer used is Bruker 120 M with the highest spectral resolution of 0.0035 cm^<-1>. Solar spectra between 500 and 4400 cm^<-1> have been measured to derive column amounts of HCl, HF,ClONO_2, and O_3 in the stratosphere.Long term O_3 decrease observed in Japan is the largest in Sapporo (43ﾟN). In addition, the O_3 changes associated with the Pinatubo eruption was much larger in Sapporo than at lower latitudes [Kondo et al., 1995]. Occasionally, air masses inside the vortex are transported over Rikubetsu in spring. Because the latitude of Rikubetsu is close to Sapporo, measurements of these species will give us an improved understanding the mechanism of the large O_3 changes observed at 43ﾟN.The temporal variations of HCl and HF vertical column amounts have been observed since July 1995. Both species show seasonal variation increasing from autumn to winter. It has been found that the day-to-day variations of these two species are well correlated. Changes in the tropopause height are also well correlated with the changes of these species. We plan to obtain column amounts of HCl, HF,ClONO_2 and O_3 observed during a whole year period and make analysis of these values in terms of chemical and transport processes.Reference : Kondo et al., Stratospheric ozone changes at 43ﾟN and 36ﾟN over Japan between 1991 and 1994, Geophys. Res.Lett, 22,3223-3226,1995.