基于OMI数据的京津冀地区对流层NO2浓度遥感监测

为了解京津冀地区对流层NO2垂直柱浓度的时空变化，利用Aura卫星上OMI传感器反演获取2005~2016年对流层NO2垂直柱浓度数据进行分析。结果表明：京津冀地区的NO2垂直柱浓度空间分布呈现出从中部和东南平原地区向西北坝上高原地区逐渐降低的趋势,并且发现，京津冀地区的12 a的年均季节空间分布与NO2柱浓度年均空间分布趋势相似；京津冀地区NO2柱浓度月均值呈现出以每年为一个周期的波浪形变化，年均增长率为2.66%。2005~2010年京津冀地区的NO2年柱浓度值处于上升趋势，2014~2015年NO2浓度急剧下降，2016年又开始上升。京津冀地区NO2柱浓度值有季节差异，大体上呈现秋季、冬季高于春夏两季，冬季最高，夏季最低。利用线性拟合发现，京津冀的地面监测NO2柱浓度值和OMI传感器获取的NO2柱浓度值整体上显著相关且相关性很高。关键词： 对流层NO2浓度；OMI数据；时空变化；京津冀地区

Remote Sensing Monitoring of Tropospheric NO2 Density #br# in Beijing-Tianjin-Hebei Region Based on OMI Data

In order to understand the spatiotemporal change of NO2 vertical column density in Beijing-Tianjin-Hebei region, the tropospheric NO2 vertical column density from 2005 to 2016 were analyzed by OMI remote sensing data from Aura satellite. The results showed that the spatial distribution of NO2 vertical column density in Beijing-Tianjin-Hebei region showed the decrease trend from the middle and southeastern plains to the northwestern Bashang plateau. The seasonal spatial distribution of NO2 column density was similar to the annual average distribution in Beijing-Tianjin-Hebei region during these twelve years. The average annual growth rate of NO2 density in Beijing-Tianjin-Hebei region was 2.66% with twelve years as one cycle. The NO2 density increased from 2005 to 2010, decreased sharply from 2014 to 2015, and increased in 2016. As for seasonal change, NO2 vertical column density values in autumn and winter were significantly higher than those in spring and summer. The highest NO2 densities appeared in winter and the lowest appeared in summer. Using linear fitting method, it was found that the density of NO2 column in Beijing-Tianjin-Hebei area was significantly correlated with the NO2 column density obtained by OMI sensor and the correlation was very high.Key words：tropospheric NO2 density, OMI data, spatio-temporal change, Beijing-Tianjin-Hebei region