中文摘要：

通过研究2009年11月广州市气溶胶颗粒物质量浓度（PM10、PM2.5、PM1）、黑碳浓度、散射系数（Scatter）等大气成分要素,以及微波辐射计、激光雷达及风廓线雷达所探测的风、温、湿等边界层结构,统计分析广州旱季一次典型灰霾过程（2009年11月23—29日）中气溶胶颗粒物及其光学特性的时空变化特征,并配合天气形势背景、边界层结构对其形成原因进行详细分析。在典型灰霾过程中,黑碳浓度高达58.7μg/m3,散射系数高达1 902.7 Mm-1,PM10浓度高达423.5μg/m3,PM2.5浓度高达355.7μg/m3,PM1浓度高达286.5μg/m3。通过对同期的气象条件分析表明在广州地区旱季,区域性污染过程,特别是灰霾天气的形成具有以下三种气象条件：大气边界层高度较低;高压变性出海的天气形势与之密切相关;在偏东和偏南气流带来的高湿度环境下,气溶胶吸湿增长效应显著,导致出现严重灰霾天气。

英文摘要：

A study is made with the dataset（observed in November 2009, Guangzhou）, which includes aerosol particle mass concentration （PM10, PM2.5, PM1）, black carbon concentration, scattering coefficient, microwave radiometer measurements, laser radar and wind profiler data such as boundary layer structure of wind, temperature, and humidity. Statistical analyses are made for optical properties of aerosol particles and their spatial and temporal variations. With weather situation, meteorological background and boundary layer structure, a detailed analysis is presented of the causes of a typical haze process during the dry season （23-- 29 November 2009） over Guangzhou area. In the course of this typical haze, the concentration of black carbon was 58.7 μg/m^3, scattering coefficient 1902.7 Mm-1, PM10 concentration 423.5 μg/m^3, PM2.5 concentration 355.7 μg/m^3, and PM1 concentration 286.5 μg/m^3. Weather conditions over the same period showed that during the dry season over Guangzhou area, a process of regional pollution, especially the formation of a haze process, is accompanied with low atmospheric boundary layer and closely related with high variability of weather situation at sea. In the easterly and southerly flow of high humidity environment, significant aerosol hygroscopic growth results in severe haze.