摘要
Abstract
To enhance the study of transport pathways and potential sources of atmospheric pollutant NO2 in Urumqi,the atmospheric pollution characteristics of NO2 concentration in Urumqi were analyzed using the OMI remote sensing monitoring tropospheric NO2 vertical column concentration(VCD)data from 2017-2022.The study utilized the backward trajectory model,potential source area contribution analysis and concentration weighted trajectory to reveal the trends of potential source areas of NO2 and their contribution to NO2 VCD in the study area in different seasons.The results indicate that over the five-year period,the NO2 VCD in Urumqi has shown a fluctuating downward trend.The largest decrease in NO2 VCD occurred during the spring and summer of 2020,with a range be-tween 18.45%and 35.25%.The spatial distribution of high-pollution areas has continuously narrowed down to the central urban areas with larger population bases.The trajectory of air masses affecting NO2 pollution in Urumqi is greatly influenced by the topography of the mountain-basin system.During the spring,autumn,and winter,there has been an increasing frequency of long-distance airflow from Kazakhstan(accounting for 25.74%,21.11%,and 41.83%respectively in 2022).The potential source areas of NO2 pollution show significant seasonal variations.In the autumn and winter,the source areas are widely distributed and have high contributions,while in the spring and summer,the source areas are narrow and have low contributions.The potential source areas primarily include local sources and sources from the western regions.Local sources appear as severe pollution sources in the autumn and winter,gradually increasing their contribution to NO2 pollution.The source areas have gradually contracted to the Shayibake District and Dabancheng District in Urumqi.The western source areas are mainly moderate pollution areas,and in recent years,they have expanded westward to regions such as southwestern Ili Kazakh Autonomous Prefecture,Aksu Region,and Bayingolin Mongolian Autonomous Prefecture.关键词
乌鲁木齐/对流层NO2垂直柱浓度(VCD)/后向轨迹/潜在源区贡献/浓度权重轨迹Key words
Urumqi/Tropospheric NO2 Vertical Column Density(VCD)/Backward trajectory/Potential source region contribution/Concentration weighting trajectory分类
资源环境
