MOZART-2对欧洲地区对流层臭氧的模拟研究

本文运用新建立的全球三维大气化学模式MOZART-2与全球大气环流模式CAM2的离线耦合模式系统对欧洲地区地面和对流层臭氧浓度进行了数值模拟研究。模式的模拟结果分别与欧洲两个站点的地面观测资料和四个站点的臭氧探空观测资料进行了对比分析研究。通过将模拟结果与欧洲地面观测资料的对比分析表明，该模式系统除了对德国Hohenpeissenberg地面观测站臭氧浓度略微高估和荷兰Kollumerwaard地面观测站臭氧浓度有些低估外,能基本上反映所在地区地面臭氧和一氧化碳浓度的季节变化特征。通过将模拟结果与德国Lindenberg和芬兰Sodankyla两个站点臭氧探空观测资料的对比分析表明，该模式系统能较为成功地再现对流层臭氧浓度的大小和垂直梯度特征，特别是能较为准确地模拟出两站点秋季对流层中部臭氧浓度的大小。另外，该模式系统也能够基本上反映该地区对流层臭氧浓度的季节变化和纬度变化特征，对德国Hohenpeissenberg站点和挪威Nyalesund站点对流层上层臭氧浓度的模拟结果更接近于观测值。本研究结果表明，该模式系统对欧洲地区对流层臭氧浓度的大小和分布具有良好的模拟性能，这为进一步运用该模式系统探讨欧洲地区的污染排放物对亚洲的输送问题提供了科学的依据。

A Simulation Study of Tropospheric Ozone over Europe with MOZART-2

An off-line coupling model system consisting of a global three-dimensional atmospheric chemistry transport model MOZART-2 and a global three-dimensional atmospheric circulation model CAM2 is newly set up and applied to simulate tropospheric ozone over Europe. Comparison of model results with multi-year ground level observations over Europe shows that the seasonal variations of surface ozone mixing ratios can be generally reproduced with slight overestimations at Hohenpeissenberg and a little underestimation at Kollumerwaard; in addition, the magnitude and general features of surface CO seasonal variations can also be well captured. Compared with ozonesonde observation data at Lindenberg in Germany and Sodankyla in Fanland, the vertical gradient and magnitude of tropospheric ozone mixing ratios can be well reproduced, especially in autumn when the simulated mid-troposphere ozone levels at above both sites are in better agreement with observations. Compared with ozonesonde observations at Hohenpeissenberg in Germany and Nyalesund in Norway, seasonal cycles of ozone concentrations at 300hPa, 500hPa and 800hPa can also be fairly reproduced, especially at 300hPa. Overall, good simulations of tropospheric ozone concentrations over Europe by using this model system can lay a scientific basis for further study of Tran-Eurasian transport of pollutants.