摘要
利用三维中尺度非静力模式ＭＭ５和化学模式，对１９９４年８月１６～１８日，１９９５年１月７～９日冬夏两个不同时期中国大陆大气对流层臭氧及其前体物质的分布进行了数值模拟。同时深入地分析了青藏高原地区夏季对流层臭氧的分布。模拟结果地面臭氧和ＮＯｘ的分布与观测结果基本一致，人类活动和光化过程是决定地面臭氧和ＮＯｘ的主要因子。对流层臭氧浓度的分布与气流的辐合辐散存在较好的对应关系，辐合区臭氧浓度较高，辐散区臭氧浓度较低。夏季，青藏高原中低空存在很强的辐合气流，使周边臭氧向高原辐合；而高原高空，受南亚高压控制存在很强的反气旋环流，臭氧由高原向周边辐散。冬季，受西风气流控制，臭氧分布表征大尺度特征。西风急流区臭氧浓度偏低，而急流两侧臭氧浓度偏高。
he mechanism of the distributions of tropospheric ozone and its precursors over China has been simulated by means of threedimensional MM5 and chemical model in summer and winter time, 16～18 August 1994 and 7～9 January 1995, and the distribution of ozone over Tibetan Plateau in summer time is deeply discussed. The simulated results indicated that the distributions of surface ozone and NOx have a good agreement with measured results, and human activities and photochemical reactions are the main factors controlling the surface ozone and NOx concentration. In addition, higher ozone concentrations are coincided with the air convergence, and the lower are related to the air divergence. In summer, over Tibetan Plateau the strong flow convergence results in higher ozone concentrations in the lower troposphere; and the strong flow divergence results in lower ozone concentrations in the upper troposphere. In winter time ozone concentrations show large scale characteristics controlled by western flow, the ozone concentrations in jet area are lower than the other areas.
出处
《气象学报》
CSCD
北大核心
1998年第3期333-338,共6页
Acta Meteorologica Sinica
基金
国家自然科学基金
