• 关键词：NO₂  聚类分析  潜在源贡献  浓度权重轨迹  阿克达拉

• 基金项目：第二次青藏高原综合科学考察研究项目（No.2019QZKK010206）；新疆高层次人才引进项目（2016-金莉莉）

• 赵权威
• 1. 新疆大学资源与环境科学学院, 乌鲁木齐 830046;2. 中国气象局乌鲁木齐沙漠气象研究所, 乌鲁木齐 830002

• 何清
• 中国气象局乌鲁木齐沙漠气象研究所, 乌鲁木齐 830002

• 王慧琴
• 中国气象局乌鲁木齐沙漠气象研究所, 乌鲁木齐 830002

• 金莉莉
• 中国气象局乌鲁木齐沙漠气象研究所, 乌鲁木齐 830002

• 李汉林
• 1. 新疆大学资源与环境科学学院, 乌鲁木齐 830046;2. 中国气象局乌鲁木齐沙漠气象研究所, 乌鲁木齐 830002

• 王建林
• 阿克达拉区域大气本底站, 阿勒泰 836500

• 摘要：基于HYSPLIT模式和全球资料同化系统气象数据（GDAS），计算了2015年12月-2016年11月阿克达拉国家大气本底站48 h气流后向轨迹，并结合同期NO₂小时监测数据，综合运用聚类分析、潜在源贡献因子法（PSCF）和浓度权重轨迹法（CWT），分析不同季节气流轨迹对阿克达拉NO₂污染物浓度的影响，并揭示不同季节NO₂潜在污染源区分布及其贡献水平.结果表明：冬季来自东南方向的气流轨迹占比最高，春、夏、秋季气流轨迹主要来自西北方向，来自西北的长距离气流轨迹NO₂质量浓度较低；WPSCF表明重度污染网格出现在冬季的风口区如阿拉山口、达坂城谷地，四季中度污染网格出现在准噶尔盆地及周边地区、额尔齐斯河谷、哈萨克斯坦东部和俄罗斯南部；WCWT和WPSCF潜在源区分布较为一致，WCWT分析表明春、冬两季的NO₂贡献高值区污染程度大于夏、秋两季，春、冬两季NO₂污染网格贡献值为6~9 μg·m^-3，夏、秋两季污染网格贡献值集中在5~7 μg·m^-3.对于阿克达拉背景站点而言，NO₂污染物总体浓度水平较低，揭示其NO₂输送轨迹和污染源区，为区域大气污染联防联控提供重要参考.

• Abstract：Aiming to analyze the effects of airflow trajectories in different seasons on the concentrations of NO₂ pollutants to reveal the distribution and contribution levels of potential sources of NO₂ in different seasons, the 48 h backward trajectories during the period from December 2015 to November 2016 in Akdala Atmospheric Background Station (AABS) are derived by Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) modeling driven with the meteorological data from Global Data Assimilation System (GDAS). By combining the hourly monitoring data of NO₂ concentrations during the same period, and the HYSPLIT modeing data is further analyzed by using methods of cluster analysis, potential source contribution function (PSCF) and concentration-weighted trajectory (CWT). The results reveal that most of the airflow trajectories come from the southeast direction in winter, and but from the northwest direction in spring, summer and autumn with low NO₂ concentrations. The weighted PSCF (WPSCF) shows that the heavily polluted grids appear in the areas such as Alashankou and Dabancheng Valley in winter, while the moderately polluted grids in the four seasons occur in the Junggar Basin and surrounding areas, the Irtysh Valley, eastern Kazakhstan and southern Russia. Furthermore, the WPSCF value of NO₂ is similar to the weighted CWT (WCWT) value. Specifically, WCWT shows that the NO₂ pollution grid contribution values in spring and winter (6~9 μg·m^-3) are greater than those that in summer and autumn (5~7 μg·m^-3). This study concludes that the overall concentration level of NO₂ pollutants is relatively low for AABS, whose NO₂ transport trajectory and pollution source area are also revealed, providing an important reference for the joint prevention and control of regional atmospheric pollution.

• Key words：NO₂  cluster analysis  potential source contribution function  concentration-weighted trajectory  Akedala

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