成都地区2005～2015年对流层NO_2柱浓度趋势与时空分布

Spatiotemporal Distribution Characteristics of Troposphere NO_2 Columns in Chengdu Region during 2005-2015

根据臭氧观测仪数据,分析成都地区2005年1~12月NO_2对流层柱浓度时空分布特征。结果表明,研究期间对流层NO_2柱浓度年均值为10.31×10^(15)molec·cm^(-2),总体呈波动上升趋势,年上升率为0.42 molec·cm^(-2)·yr^(-1),主城区西北部的上升趋势最明显。NO_2柱浓度时间分布特征呈现:11月和12月最高,7月和8月最低。空间分布上,NO_2柱浓度高值区中心位于城区及偏北区域;山区最低;农业地区可能受季节性的秸秆燃烧影响较大。

According to the remote sensing data obtained from Ozone Monitoring Instrumentsatellite,the study analyzed the spatiotemporal distribution of troposphere NO2 column and its variation from January 2005 to December 2015 in Chengdu region. It shows that the annual average of tropospheric NO2 columnswas 10.31×1015 molec·cm-2during study period. Its rising rate in average was 0.42 molec·cm-2·yr-1,with the most significant trend in regions northwest of the urban area.It was observed that troposphericnitrogen dioxide columns reached their maximum in November and December,and minimum in July and August. As for spatial distribution,the highest concentration of NO2 column was observed in urban area and north of it and lowest in mountainous area,and the agriculture region was effected by biomass burning probably.