郑向东,周秀骥,秦瑜,汤洁,李维亮. 2003. 一次对流层异常臭氧次峰的观测研究及其动力输送过程的分析[J]. 气象学报, 61(3):257-266, doi:10.11676/qxxb2003.025
一次对流层异常臭氧次峰的观测研究及其动力输送过程的分析
ANALYSIS FOR A CASE OF OZONE DOWNWARD TRANSPORT FROM STRATOSPHERE TO TROPOSPHERE AS OBSERVED OVER XINING, CHINA
投稿时间:2001-09-13  修订日期:2002-05-25
DOI:10.11676/qxxb2003.025
中文关键词:  臭氧次峰  后向轨迹  对流层顶折叠  平流层向下输送
英文关键词:Ozone peak  Backward trajectory  Stratosphere-tropospher exchange  Tropopause folding
基金项目:国家自然科学基金资助(项目批准号49975026);中国气象科学研究院博士启动基金
作者单位
郑向东 中国气象科学研究院, 北京, 100081 
周秀骥 中国气象科学研究院, 北京, 100081 
秦瑜 北京大学物理学院, 北京, 100871 
汤洁 中国气象科学研究院, 北京, 100081 
李维亮 中国气象科学研究院, 北京, 100081 
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中文摘要:
      文中分析了1996年8月1日发生在西宁(36.43°N,101.45°E,海拔:2296m)地区对流层异常臭氧次峰现象。观测资料揭示了高空低压槽东移是臭氧次峰的主要天气特征。三维后向轨迹计算表明,尽管代表臭氧次峰的气团可以追溯到中亚地区,但是明显的气团向下输送则发生在新疆、青海间的高空低压槽内。中尺度模拟进一步确认了对流层顶折叠和平流层向下输送是臭氧次峰出现的动力机制。臭氧次峰在对流层高度位置与准无辐散层有关。
英文摘要:
      A case study on the ozone downward transport from stratosphere to troposphere over Xining (36.43°N, 101.45°E, 2296 m asl) on August 1st, 1996 has been given out by the methods of observational analysis, 3-dimensional backward trajectory calculation and the mesoscale modeling. Routine radiosonde data show that the main synoptic characteristics of this case were the east erly shift of the trough in the upper troposphere. As a result of the synoptics, a pronounced ozone peak was detected around 7 km over Xining. 3-dimensional trajectory calculations imply that the air parcels of ozone peak around 7 km may be traced to the middle Asia region, but the distinguished downward transport from strat osphere to troposphere induced was over the region from Xinjiang to Qinghai. Furthermore, mesoscale simulation confirms that the temporal and spatial evolution of tropopause folding indexed by the potential vorticity is the critical mechanism of such downward incursion. The modeling work also shows that the altitude of tropospheric ozone peak was associated with stable quas-izero divergence layer, which reflects the temporal dynamical balance in troposphere.
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