颜鹏 ,张养梅,杨东贞 ,汤洁 ,于晓岚,程红兵 ,俞向明. 2005. 2003年夏季临安地区大气气溶胶离子成分的尺度分布特征[J]. 气象学报, 63(6):980-987, doi:10.11676/qxxb2005.093
2003年夏季临安地区大气气溶胶离子成分的尺度分布特征
THE CHARACTERISTICS OF AEROSOL IONIC SIZE DISTRIBUTIONS AT LIN'AN IN SUMMER OF 2003
投稿时间:2005-04-04  修订日期:2005-05-24
DOI:10.11676/qxxb2005.093
中文关键词:  气溶胶,离子成分,尺度分布
英文关键词:Aerosol, Ionic components, Size distributions.
基金项目:科技部项目“大陆大气本底监测”(2001DIA10009)和国家自然科学基金重大国际合作项目(40121120827)
作者单位
颜鹏 北京大学大气科学系北京, 100871
中国气象科学研究院气候与环境研究所北京,100081 
张养梅 中国气象科学研究院气候与环境研究所北京, 100081 
杨东贞 中国气象科学研究院气候与环境研究所北京, 100081 
汤洁 中国气象科学研究院气候与环境研究所北京, 100081 
于晓岚 中国气象科学研究院气候与环境研究所北京, 100081 
程红兵 中国气象科学研究院气候与环境研究所北京, 100081 
俞向明 临安大气本底污染监测站临安,311307 
摘要点击次数: 2813
全文下载次数: 3100
中文摘要:
      文中利用2003年夏季在浙江临安大气本底污染监测站观测的资料,分析了临安的气溶胶质量浓度、离子成分的尺度分布特点及主要离子间的相互关系。初步结果显示,该期间临安气溶胶主要以粒径小于2.1μm的细粒子为主,约占总质量浓度的66%,其中粒径小于0.65 μm的粒子可达总质量浓度的50%,远高于其他各级尺度段上的粒子浓度。与质量浓度分布相似,可溶性无机离子成分主要集中在粒径小于2.1μm(记为PM2.1)的细粒子中,PM2.1粒子中可溶性无机离子约占所有尺度段(包括所有5级)离子质量浓度总和的88%。其中粒径小于0.65 μm的亚微米粒子中的离子质量浓度是细粒子的主要部分,占所有尺度段上离子质量浓度总和的77%。SO ,NH 和K+是PM2.1中决定性的离子成分。相关分析和离子平衡表明,PM2.1中SO 与NH 和K+ 有很高的相关,在粒径小于0.65μm的亚微米粒子中,非海盐硫酸盐(Nss-SO )主要为(NH4)2SO4,由气-粒转化产生;而在粒径为0.65~2.1μm尺度段,Nss-SO 除(NH 4)2SO 4外,可能还有K2SO 4,Na2SO4等存在。
英文摘要:
      During July 2003,a comprehensive field measurements on aerosol chemical, physical and radiative properties at Lin'an regional background monitoring station in Yangtze delta region of China were conducted by the project “An observational study on the continental baseline air over China”.Only size resolved ionic characteristics of aerosols were discussed. Particles were sampled using Andersen multi stage impactor sampler. Afterthe sampling finished, samples were immediately shipped to the laboratory in Chinese Academy of Meteorological Science(CAMS) in Beijing for mass and chemical analysis. The mass was measured with gravimetric method using Sartorius microbalance of 0.01 mg readability, which was installed in a temperature and humidity controlled clean room. The anions were analyzed using Dionex DX 500, and the cations were analyzed using Hitachi 180-70 Atom Absoption Spectrometry(AAS). 9 inorganic ions were analyzed, which were: F-,Cl,NO ,SO ,NH ,K+,Na+,Ca2+,Mg2+.In average, the mean mass concentration of particles summing over all size ranges (TSP) during the experiment was 69.6 μg/m3,with the minimum of 45.2 μg/m3 and maximum 90.8 μg/m3,which was much lower than those obtained in the period from August to October, 1991,and also lower than that measured in October 1994 at the same site. The calculated PM11 (<11 μm) mean mass concentration (standard deviation) was 64.0(14.9)μg/m3,and PM2.1 (<2.1 μm) was 46.2(13.2)μg/m3,which was about half of mass of PM10 and PM2.5 measured in November 1999. The investigation of weather and the emission of aerosol and its precursors indicated that the lower concentration of aerosols during this measurement were not caused by emission change, the summer dry and hot weather in that region could be the main reason. Dry and hot weather reduced the conversion process of SO2 to SO in liquid phase.Base on the size distribution of particle mass and ionic composition, which showed the high percentage of concentrations in the size range with less than 0.65μm, and ionic balance analysis, it could be inferred that the gas to particle process might play an important role in the aerosol formation during the experiment period. The statistics of aerosol data indicated that: The mass of aerosol with size less than 2.1μm accounting for 66% of total mass, in which about 50% of the mass was the particles with size less than 0.65μm. Similar to the size distribution of aerosol mass, the water soluble ions mainly concentrated on the size range of <0.65 μm, accounting for about 77% of the sum of the analyzed ions, and the ions within the range of <2.1μm reached 88%.The sulfate, ammonium and potassium were the dominant ionic components in fine particles (particle size <2.1μm). Ion balances implied that the sulfates in fine particles were mostly consisted of (NH 4) 2SO 4,Na 2SO4 and K2SO4, but in submicron particles the non seal salt sulfate (NSS - SO ) was produced through gas-particle conversion process, and in the form of (NH4) 2SO4.
HTML   查看全文   查看/发表评论  下载PDF阅读器
分享按钮