中国高分辨率近地面NO_2浓度反演

Retrieval of NO_2 Concentrations in High Resolution Near-surface in China

通过分析2010年全国333个县级以上城市卫星遥感的NO2对流层年均柱浓度与地面实际观测浓度之间的相关性,发现两者具有一定的线性相关性(r=0.54,n=333),并建立了NO2"遥感柱浓度"与"地面观测浓度"之间的关联方程,通过该方程反演了中国0.125°分辨率近地面NO2污染分布特征。结果表明,全国近地面NO2浓度超过《环境空气质量标准》(GB 3095—2012)要求的年均浓度二级标准(0.04 mg/m3)的区域约为5.95万平方千米,超标地区主要集中在华北平原、长三角地区、四川盆地和珠三角地区,这些地区NO2污染水平远高于333个城市的年平均值(0.028 mg/m3)。NO2污染极不平衡,以大中型城市为中心的区域污染特征显著。NO2人口加权浓度分析结果表明,NO2人口加权浓度高值区主要集中在能源消费量大、机动车保有量大及人口密集的地区,全国约5.7%的人口暴露在NO2超标区域。

By analyzing annual average concentrations of NO2 tropospheric column density from satellite remote sensing and ground concentrations of NO2 in 333 cities above county level in 2010, this study found there was a linear correlation （r = 0. 54, n = 333 ） between them, the correlation equation was established, the O. 125 degree NO2 distributions near-surface were obtained. The results showed that： the area was about 59,500 square kilometers where NO2cOncentratiOn was greater than the national secondary limit 0. 04mg/m3 , mainly in the North China Plain, the Yangtze River Delta, Pearl River Delta and the Sichuan Basin; NO2 concentrations in these areas were much higher than the average value O. 028mg/m3 of 333 cities. The heavy pollution distributions were extremely uneven, it is mainly located in metropolis and medium-sized cities. The NO2 population-weighted concentration analysis showed that high value is mainly concentrated in metropolis and medium-sized cities with more energy consumptions, more vehicles and higher population density; approximately 5.7% of the population were exposed to the atmosphere where NO2 concentration was over 0. 04 mg/ma.