With the size-resolved aerosol mass and ion composition data obtained at Lin＇an regional atmospheric pollution monitoring station in July 2003, the size distributions of aerosol mass and ionic components, and the cor...With the size-resolved aerosol mass and ion composition data obtained at Lin＇an regional atmospheric pollution monitoring station in July 2003, the size distributions of aerosol mass and ionic components, and the correlations between major ion pairs were analyzed. The primary results indicate that in the period of in-situ measurement, the aerosols are mainly composed of fine particles. The mass of aerosols with size less than 2.1 μm accounts for 66% of the total mass of all size ranges, in which about 50% of the mass is contributed by the particles with size less than 0.65 μm. Similar to the size distributions of aerosol mass, the water-soluble ions are mainly concentrated in the size range of 〈0.65 μm, accounting for about 77% of the sum of analyzed ions, and the ions within the range of 〈2.1 μm reach 88%. The sulfate, ammonium, and potassium are the dominant ionic components in fine particles （particle size less than 2.1 μm）. Ion correlation analysis suggests that the sulfates in fine particles are mostly in the compounds of （NH4）2SO4, Na2SO4, and K2SO4, but for submicron particles the sulfates are mainly in the form of （NH4）2SO4.展开更多
基金Supported jointly by the China Ministry of Science and Technology Project No. 2001DIA10009the China NSF International Project No. 40121120827.
文摘With the size-resolved aerosol mass and ion composition data obtained at Lin＇an regional atmospheric pollution monitoring station in July 2003, the size distributions of aerosol mass and ionic components, and the correlations between major ion pairs were analyzed. The primary results indicate that in the period of in-situ measurement, the aerosols are mainly composed of fine particles. The mass of aerosols with size less than 2.1 μm accounts for 66% of the total mass of all size ranges, in which about 50% of the mass is contributed by the particles with size less than 0.65 μm. Similar to the size distributions of aerosol mass, the water-soluble ions are mainly concentrated in the size range of 〈0.65 μm, accounting for about 77% of the sum of analyzed ions, and the ions within the range of 〈2.1 μm reach 88%. The sulfate, ammonium, and potassium are the dominant ionic components in fine particles （particle size less than 2.1 μm）. Ion correlation analysis suggests that the sulfates in fine particles are mostly in the compounds of （NH4）2SO4, Na2SO4, and K2SO4, but for submicron particles the sulfates are mainly in the form of （NH4）2SO4.
