【作者】 屈文军； 张小曳； 盛立芳； 王丹；

【Author】 QU Wen-jun1, ZHANG Xiao-ye2, SHENG Li-fang1, WANG Dan3 (1.Ocean-Atmosphere Interaction and Climate Laboratory, Department of Marine Meteorology, College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;2.CAWAS, Chinese Academy of Metrological Sciences, CMA, Beijing 100081, China;3.SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China).

【机构】 中国海洋大学海洋环境学院海洋气象学系海洋-大气相互作用与气候重点实验室； 中国气象科学院中国气象局大气成分观测与服务中心大气化学重点开放实验室； 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室；

【摘要】 2007年5月～10月在黄海海滨青岛的观测表明大气PM2.5和PM10质量浓度呈同步变化,且变化范围较大。海陆风转换对海滨空气质量有重要影响:海风输送时空气较洁净,而陆风输送通常导致空气质量变差。PM2.5、PM10质量浓度与相对湿度(RH%)呈显著反相关,可能与RH%较高时多为海风输送有关。海风输送条件下较高的RH%和细粒子吸湿增长可能导致了此时PM2.5对PM10质量载荷的贡献率(64.7%)小于在海风/陆风混合输送和陆风输送条件下的贡献率(70.9%和77.5%)。PM2.5占PM10质量载荷的72.3%,表明细粒子贡献显著。整个观测期PM10未"达标"(PM1024hr均值<150μgm–3,空气质量"良")的观测日仅占14.7%;但PM2.5未达到美国EPA标准(PM2.524hr均值<35μgm–3)的观测日约为68.6%,表明大气细颗粒物PM2.5的达标任务尚很艰巨。更多还原

【Abstract】 24-hour averaged PM2.5 (particles ≤ 2.5 μm) and PM10 (particles ≤ 10 μm) mass concentrations were measured from bulk aerosol samples at a coastal site of Baguanshan (BGS) in Qingdao, China from May to October 2007, which show synchronous variations for PM2.5 and PM10 with large ranges. It is found that transition of marine and continental wind influence coastal air quality evidently, i.e. marine wind always associated with clean air, while the air quality usually deteriorated with continental wind transport. Significant negative correlations were found between PM2.5 and PM10 mass concentrations with the ambient relative humidity (RH%), probably due to marine wind associated with high RH% and clean air. Higher RH% associated with efficient hygroscopic growth of the fine particles (≤ 2.5 μm) under marine wind transport might result in lower contribution of PM2.5 to PM10 mass loading (64.7%) then than those under maine/continental wind and under continental wind transport (70.9% and 77.5%). PM2.5 accounted for 72.3% of PM10 mass loading, indicating significant contribution of fine particles to the aerosol. The observation days with PM10 didn’t meet the air quality standard of the Chinese Ministry of Environment Protection (PM10 24hr mean < 150 μg m–3, air quality "good") account for ~14.7%; however, the days didn’t meet the PM2.5 standard of the US EPA (Environment Protection Administration) (PM2.5 24hr mean < 35 μg m–3) account for ~68.6%, indicating implement of the controlling target of atmospheric fine particles (PM2.5) in Qingdao was still tough.更多还原