【摘要】 2007年4月利用黑碳仪(Aethalometer)、颗粒物在线观测仪(TEOM1400a)和现时天气现象传感器(PWD22)获得了大气细粒子中每5 min黑碳气溶胶(BC)浓度以及每30 min PM2.5浓度及大气能见度观测数据。结果发现:黑碳日均值浓度为7.4±2.9μg.m-3,变化范围分别为2.1~11.6μg.m-3。PM2.5日均值浓度为77.4±35.9μg.m-3,浓度变化范围分别为29.6~183.3μg.m-3。黑碳小时浓度变化具有2个明显的峰值,主要与机动车尾气排放密切相关。黑碳浓度与PM2.5浓度呈正相关,与大气能见度呈负相关,相关系数为分别为0.707和-0.529,表明黑碳是PM2.5中的重要组成部分,对大气能见度的影响较显著。更多还原

【Abstract】 Black carbon(BC) aerosol and PM2.5 aerosols and visibility have been measured with an Aethalometer and TEOM1400a(Tapered Element Oscillating Microbalance) and Present Weather Detectors at Guangzhou station in April 2007.The results indicated that average BC daily concentration was found to be 7.4±2.9 μg·m-3,ranged from 2.1 to 11.6 μg·m-3 and average PM2.5 daily concentration was found to be 77.4±35.9 μg·m-3,ranged from 29.6 to 183.3 μg·m-3,respectively.Two notable peaks appeared in the hourly variations of BC,which has been related to the direct emissions from motor vehicles.Average BC and PM2.5 concentration has a good positive relationship and has a good negative relationship with visibility;the correlation coefficient was 0.707 and-0.529,respectively.BC was important component of PM2.5 and can reduce visibility.更多还原