【摘要】 黑碳(BC)气溶胶是气溶胶的重要组成部分,目前已超过CH4,成为影响全球变暖效应的第二大重要因素,其作用仅次于CO2。本文用基于反射方法的黑碳仪测得2007年5月—2009年10月在北京房山采集到的大气颗粒物样品中的BC体积浓度,结合常规气象资料,对该地区的BC体积浓度的时间变化及影响因素进行了分析。与PIXE测定的多元素关联分析表明,BC与S存在强的正关联,而与Si(和Al)仅有弱关联。这显示,BC与前者有明显的共源性——均主要来自人为污染,而与主要来自扬尘的Si和Al异源。与其他城市和国家的观测结果进行了比较。通过条件概率函数(CPF)和Wind Rose软件分析得到了BC可能的污染源。更多还原

【Abstract】 Black carbon(BC) is an important component in aerosol.At present,BC has exceeded CH4,and become the second most important factor influencing the global warming,next to CO2.In this work,the time series characteristics and influence factors of BC in aerosol in Fangshan District of Beijing were studied based on the BC concentrations in fine particle(PM2.5) air filter samples measured by reflection method using an Aethalometer and relevant meteorological data collected during the period of May 2007 to Oct.2009.PIXE was used to determine multielements in PM2.5 aerosol samples.The strong positive correlation between BC and S implies both are mainly from man-made pollution,while the very weak correlation between BC and dust-carrying Si indicates they are from different sources.The results from this work were compared with those of other cities and countries reported in literatures.Potential source directions of BC were also studied via the conditional probability function(CPF) and the Wind Rose software.更多还原