2006～2017年京津冀大气污染传输通道城市NO2浓度时空变化分析

利用OMI传感器反演获取的全球对流层NO₂垂直柱浓度数据，分析了2006～2017年京津冀大气污染传输通道城市的对流层NO₂垂直柱浓度时空变化。结果表明，通过线性拟合得出，OMI反演NO₂垂直柱浓度与地面实测NO₂浓度呈显著正相关；京津冀大气污染传输通道城市NO₂柱浓度月均值变化具有周期性，最高值和最低值多出现在1月和7月；NO₂柱浓度在季节变化上特征明显，表现为冬季最高，秋、春季次之，夏季最低。在年际变化上，NO₂柱浓度主要表现为2006～2010年波动增长，2011～2013年基本持平，2014年后开始迅速下降；NO₂垂直柱浓度空间分布，整体呈现出西北部低、中部和东部高的空间格局；季节空间分布与这12年均NO₂柱浓度空间分布相似。

Spatial and Temporal Variations of NO2 Density in Beijing-Tianjin- Hebei Air Pollution Transmission Path Cities from 2006 to 2017

Using OMI satellite remote sensing data, the temporal-spatial variation of tropospheric NO₂ vertical column density in Beijing-Tianjin-Hebei air pollution transmission path cities from 2006 to 2017 was analyzed. Results showed that, by linear fitting, the OMI inversed NO₂ vertical column density was significantly positively correlated with the ground measured NO₂ density. The monthly mean values of NO₂ column density in Beijing-Tianjin-Hebei air pollution transmission path cities presented a periodic change, the highest and lowest values occurred in January and July, respectively. The seasonal changes of the NO₂ column density were quite obvious, highest in winter, followed by in autumn and spring, and lowest in summer. In terms of the annual variation, the NO₂ column density increased in the period of from 2006 to 2010, unchanged approximately in the period of from 2011 to 2013, and began to decline rapidly after 2014. The spatial distribution of the NO₂ vertical column density showed the pattern of low in the northwest and high in the middle and the east. The seasonal variation of the spatial distribution of NO₂ vertical column density was similar to its annual variation in the 12 years.