2015年世界田联赛期间北京地区气溶胶成分遥感分析

摘要

By combining the microphysical aerosol optical properties of the four components,the black carbon (BC),the watersoluble component (WASO),water-insoluble components (INSO),dust (DUST) described in OPAC (Optical Properties of Aerosols and Clouds) model and the data acquired using the ground based remote sensing instrument CE318 during the 15th IAAF World Championships and the consequent 2015 China Victory Day Parade,the content and the optical thickness in specified wave bands of each component are inversed.Result show that the average AOD at 440nm during phase Ⅱ (0.37) is much smaller than phase Ⅰ (0.98) and phase Ⅱ (0.95).The mass concentration of BC,WASO,INSO,DUST in phase Ⅱ (6.3,14.8,60.9,66.0 μg/m3) is much smaller than that of phase Ⅰ (10.9,49.1,86.5,290.1 μg/m3) and phase Ⅲ (9.6,148.8,112.8,143.8 μg/m3).We analyzed the total content of EC to verify BC retrievals and find that the retrieved BC mass concentration agrees well with measured content with the correlation coefficient r of 0.93.The variation of the mass concentration and aerosol optical thickness illustrated clearly that the measurements undertaken by the government greatly improved the air quality.%基于OPAC模型,利用太阳-天空辐射计观测,对2015年世界田联锦标赛期间(2015-08-02-2015-09-23)北京地区的气溶胶各成分:黑碳(BC)、可溶性成分(WASO)、不可溶性成分(INSO)、沙尘成分(DUST)进行定量反演研究.结果显示:赛会中的气溶胶光学厚度(0.37)明显小于赛会前(0.98)和赛会后(0.95);赛会中BC、WASO、INSO、DUST质量浓度(6.3、14.8、60.9、66.0μg/m3)明显比赛会前的质量浓度(10.9、49.1、86.5、290.1 μg/m3)扣赛会后的质量浓度(9.6、148.8、112.8、143.8μg/m3)低.利用气溶胶成分的离线分析技术验证了BC的反演结果,两者的相关性较好,r为0.93.气溶胶光学厚度及各成分质量浓度的变化说明赛会期间北京地区采取的保障措施对空气质量提升起到了较好的作用.