摘要:气溶胶粒子的吸湿增长对区域环境、气象与辐射收支都有巨大影响，精确的气溶胶吸湿特性观测对描述气溶胶吸湿增长特性，以及研究气溶胶对气候环境影响，拓展卫星气溶胶产品的应用有非常重要的意义。本研究提出一种基于常规气象观测（能见度、相对湿度）和空气质量观测（PM2.5浓度，即空气动力学当量直径小于等于2.5 μm的颗粒物浓度）相结合的气溶胶吸湿增长估算方法，在此基础上对浙江地区气溶胶吸湿特性的时空变化影响因素进行了探讨。研究发现，沿海的温州瓯海站的吸湿增长能力最高，长三角典型城市环境的杭州和睦小学站的吸湿增长能力次之，而地处较为洁净内陆的衢州实验学校站的吸湿增长能力最低。在时间变化中，同一站点不同湿度条件的吸湿增长变化趋势相同，温州瓯海站的吸湿性变化最为剧烈，杭州和睦小学站的吸湿性变化次之，衢州实验学校站变化较为平缓。本研究表明，浙江地区的气溶胶吸湿增长特性存在较大的时空差异，基于本方法能够在较大的时空范围内描述气溶胶的吸湿增长特性，为有限的精密观测提供重要补充。
关键词:气溶胶/
吸湿增长/
气象要素
Abstract:The hygroscopic growth of aerosol particles has great influence on regional environment, meteorology, and radiation budget. Therefore, accurate observations of aerosol hygroscopic characteristics have important implications for describing aerosol hygroscopicity, studying the effects to climatic environment and expanding applications of satellite aerosol products. This study presents a method to estimate aerosol hygroscopic growth by integrating in situ meteorological and air quality data (visibility, humidity, and PM2.5). Based on this method, temporal and spatial variations of aerosol hygroscopicity at three different sites in Zhejiang, i.e., Hemu School in Hangzhou (an urbanized site), Shiyan School in Quzhou (a clean inland site), and Ouhai in Wenzhou (a coastal site). Ouhai exhibits the highest hygroscopic growth ability, while Hemu School, which lies in the central Yangtze River delta region, shows the moderate hygroscopic growth. Compared to the other two sites, Shiyan School has less hygroscopic growth during most time of the year. Among the three sites, the largest temporal variation of hygroscopic growth is found at Shiyan School, while Hemu School and Ouhai have the moderate and the least temporal variations, respectively. This study shows that the aerosol hygroscopic growth in Zhejiang varies a lot with time and space. Based on this method, the hygroscopic growth characteristics of aerosol can be described in a large temporal and spatial range, which provides important supplements for limited in situ observations.
Key words:Aerosol/
Hygroscopic growth/
Meteorological factors
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