Abstract: Ground-level NO₂ concentrations in Shanghai between May 2006 and August 2008 are estimated using the tropospheric NO₂ column concentration data of Ozone Monitoring Instrument (OMI) onboard AURA. In-situ measurements of surface NO₂ concentrations of Xujiahui, Shanghai are corrected using global 3-D chemical transport model MOZART-2, and are used to validate the surface NO₂ concentrations derived from tropospheric columns. The results show a significant correlation between monthly mean OMI derived surface NO₂ concentrations and in-situ NO₂ surface concentrations (R²=0.88), indicating that it is reliable to infer ground-level NO₂ concentration from NO₂ tropospheric column concentration.

Key words: NO₂, MOZART, OMI, surface concentratuion, tropospheric column concentration

摘要： 利用OMI NO₂卫星遥感数据, 分析了2006年5月至2008年8月上海市NO₂对流层柱浓度, 提出了由对流层柱浓度计算NO₂地面浓度的方法。由上海市徐家汇区实地观测的近地面NO₂浓度数据, 结合全球大气化学传输模式MOZART-2, 得到经过订正的近地面NO₂浓度, 并与柱浓度计算得到的NO₂地面浓度进行了对比。结果显示, 由柱浓度计算得到的NO₂地面浓度与实地观测NO₂地面浓度月平均数据相关性为R²=0.88, 表明计算得到的NO₂地面浓度与实地观测一致性较好, 能够准确反映地面污染情况, 由卫星遥感NO₂对流层柱浓度计算NO₂地面浓度的方法是可行的。

关键词: 二氧化氮, MOZART, OMI, 地面浓度, 对流层柱浓度