Dynamics of the antarctic Ozone Hole

利用2003年在南极昭和站进行的臭氧探空仪密集观测和ILAS-II（改进型临边大气分光计-II）卫星上的观测资料，对南极臭氧空洞的消散机制进行了详细的分析。示踪剂-示踪剂相关分析和后向轨迹分析表明，臭氧的恢复是在极涡破裂之前，通过Brewer-Dobson环流和极涡内外的横向混合而开始的。结果表明，在极涡稳定期和极涡破裂期，有大量重力波向下传播能量。局部Rossby数和速端分析估计的参数表明，重力波是由重力场的自发调整机制产生的。 关于我们 对南极臭氧洞内观测到的臭氧层的特征和成因进行了分析。根据昭和站和诺伊迈尔站的臭氧探测资料，发现在14- 19 km高度范围内，臭氧混合比很低，臭氧层厚度在0.4 - 1.4km之间。利用2003年8月在美国阿拉斯加州费尔班克斯的臭氧探空仪观测资料，分析了30 km高度范围内的臭氧混合比、温度和水平风速。首先，使用垂直波数谱检查了臭氧波动中观察到的主要垂直尺度。其次，定量估计了大气重力波对平流层下部臭氧精细结构的贡献。臭氧变化的20%左右是由重力波引起的垂直位移引起的。少

Using data from intensive ozonesonde observation at Syowa Station in the Antarctic and from satellite onboard Improved Limb Atmospheric Spectrometer-II (ILAS-II) in 2003, detailed analysis was made to elucidate the dissipation mechanism of the Antarctic ozone hole. It was shown from the tracer-tracer correlation analysis and backward trajectory analysis that the ozone recovery started before the polar vortex breaking, by the Brewer-Dobson circulation and lateral mixing between inside and outside the polar vortex.Using intensive radiosonde observation data at Syowa Station in 2002, seasonal variation of gravity wave characteristics were analyzed. It was shown that significant amount of gravity waves propagate energy downward in the periods when the polar vortex was stable and when the polar vortex breaking proceeded. Local Rossby number and the parameters estimated by the hodograph analysis indicated that the gravity waves were generated by the spontaneous adjustment mechanism around th … More e polar vortex.Ozone lamina observed inside the Antarctic ozone hole observed were examined in terms of their characteristics and causes. Based on ozonesonde data at Syowa Station and Neumayer Station, it was shown that ozone lamina with a vertical depth of 0.4 to 1.4 km frequently appear in the height region of 14-19km where the ozone mixing ratio is quite low. Using backward trajectory analysis, it was revealed that these lamina were originated from the boundary region of the polar vortex.We analyzed ozone mixing ratio, temperature and horizontal wind velocities in the height region up to 30 km from ozonesonde observations at Fairbanks, Alaska in August, 2003. First, dominant vertical scales observed in the ozone fluctuations were examined using vertical wavenumber spectra. Next, the contribution from atmospheric gravity waves to the fine structure of ozone in the lower stratosphere was quantitatively estimated. About 20% of ozone variance was explained by the vertical displacement mostly due to gravity waves. Less