华南沿海某大气背景点黑碳气溶胶污染特征  

Pollution Characteristics of Black Carbon Aerosol at a Background Site of South China's Coastal Area

作　　者：邓彦阁[1] 孙天乐[1] 曾立武[1] 何凌燕[1] 黄晓锋[1] 

机构地区：[1]北京大学深圳研究生院环境与能源学院城市人居环境科学与技术重点实验室,广东深圳518055

出　　处：《环境科学与技术》2012年第11期79-82,102,共5页Environmental Science & Technology

基　　金：科技部973计划课题(2013CB228503);深圳市科技计划项目(JC201105170722A)

摘　　要：黑碳气溶胶(BC)因其显著的气候效应和对人类健康的危害而成为研究的热点。研究背景点位BC的浓度水平和来源特征有助于掌握BC在区域尺度上的辐射强迫特性和环境影响。2009年秋季在华南沿海某区域大气背景点进行了为期约40 d的BC在线观测。观测期间BC的平均浓度为(2.34±1.33)μg/m3,与其它区域背景点相比处于较高水平。利用中尺度天气研究和预报系统WRF模拟的高分辨率三维气象场数据驱动HYSPLIT-4反向轨迹模式,模拟观测期间每小时的气团轨迹,将所有轨迹分为来源特征明显的东北沿海、北方内陆、香港方向和东南海面方向四类。当受到东北沿海来源气团影响时,BC的浓度为平均水平的1.4倍,BC和CO有较好的线性相关关系,而其它三类气团影响时的BC浓度都低于平均浓度,且BC和CO的相关关系很差,说明来自东北沿海地区的较近距离区域传输是影响该背景点大气BC的主要源区。Because of its remarkable climate and health effect,black carbon aerosols（BC）are becoming the focus of research.Study of distribution and sources of BC in background areas is essential to understand its impact on radioactive forcing and the environment in regional scale.Observation was launched in fall of 2009 for about 40 d at a rural site of South China＇s coastal area.Average concentration of BC was（2.34±1.33） μg/m3,which was at a high level when compared with other background sites.High resolution meteorological data from weather research and forecast model（WRF） was used to run hybrid single particle Lagrangian integrated trajectory 4（HYSPLIT-4）hourly during the observation period.Trajectories from HYSPLIT-4 were divided into 4 distinct categories such as northeast coastal,north inland,Hongkong direction and southeast sea surface.BC concentrations was about 1.4 times of average and there was a good correlation between BC and CO when influenced by air masses from northeast coastal area while the other three air masses had relative low BC concentrations and poor BC and CO correlations,which indicated that the short-range regional transport from northeast is the main BC source area of this background site.

关 键 词：黑碳 背景点 天气研究和预测模型(WRF) 混合单颗粒拉格朗日积分轨迹模型-4(HYSPLIT-4) 

分 类 号：X51[环境科学与工程—环境工程]