利用SCIAMACHY遥感资料研究我国NO2柱 浓度及其时空分布

利用SCIAMACHY/ENVISAT 2003—2009年月均观测数据,结合1∶4 000 000行政区划图,得到了近7 a来我国城市级别NO2柱浓度的时空分布和变化趋势,并采用Seasonal Mann-Kendall非参数检验方法对各城市的变化趋势进行了显著性分析.结果表明:我国NO2分布东高西低,NO2柱浓度高值区主要分布在京津冀及环渤海区域、长江三角洲北部及广东省等地区.近7 a来我国北部和中部地区的NO2增长趋势显著,NO2柱浓度平均值最高和增速最快的前20个城市主要分布在江苏、山东和安徽等省的二级城市郊县和小城市.与统计年鉴工业废气排放数据的比较表明,工业废气排放与NO2柱浓度及其时空分布具有较好的一致性.这种新的NO2污染格局应该引起重视并采取有针对性的污染监管措施.

Study on Spatial-Temporal Variations in Total NO2 Column Amounts over China Using SCIAMACHY Data

The spatial-temporal distribution and variation trends of NO2 total column amounts over China were analyzed based on the monthly nitrogen dioxide(NO2) data derived from SCIAMACHYENVISAT observations between 2003 and 2009,and upon the administrative map at a scale of 1∶4 million.The significance level of the variation trends of NO2 total column density for each city was tested by the non-parameter method of seasonal Mann-Kendall.The results showed that the NO2 total column amounts were larger in the east than in the west,and the largest NO2 amounts were mainly distributed over Beijing,Tianjin,Hebei,the Bohai Rim,north of the Yangze River Delta,Guangdong Province,and more.NO2 amounts in northern and central China increased significantly over the past seven years.The top 20 cities with the highest average concentrations and fastest growing NO2 total column amounts are mainly the suburban and small cities in Jiangsu,Shandong and Anhui Provinces,but not the metropolitan or the provincial capitals.Comparison of industrial waste gas emissions between data from the environmental yearbooks and the satellite-derived NO2 data shows that industrial emissions are positively correlated with the total column density and the spatial-temporal distribution of NO2.Attention should be paid to the change of NO2 pollution patterns,and targeted strategies should be applied in monitoring and controlling NO2 pollution.