摘要
研究了爱尔兰西海岸国际海洋大气研究站夏季(2002年8月12～22日)大西洋气团颗粒物中水溶性无机离子的含量与其粒径关系.海盐成分(Cl-、SO42-、Na+、Ca2+、Mg2+、K+)含量在粗颗粒物中随粒径呈双峰分布(0.8～30 μm),但Ca2+和K+受陆域源影响,在亚微米颗粒区间出现另一分布峰(0.1～0.8 μm).二次颗粒物成分在所有颗粒物中均有检出;NO3-呈广域宽带分布,其中大部分出现在海盐主峰区(0.8～8 μm,存在Dp 1.4 μm和Dp 4.4 μm两种模态);nss-SO42-(非海盐硫酸根)和NH4+呈相关三峰分布(Dp 0.44 μm、Dp 1.4 μm和Dp 4.4 μm),CH3SO3-也呈相似三峰分布(Dp 0.44 μm、Dp 1.4 μm和Dp 8 μm),三者在亚微米颗粒区间同位出现主峰.二次颗粒物成分Dp 1.4 μm模态在海岸空气颗粒物研究文献中尚少见报道.讨论了亚微米区间二次颗粒物盐类的化学形态.TSP中nss-SO42-、NO3-、NH4+和CH3SO3-的日均浓度分别为0.279、0.171、0.158和0.041 μg/m3.
The mass concentrations and size distributions of the water-soluble ionic species were measured with a MOUD! cascade impactor at Mace Head on the west coast of Ireland during Aug 12 - 22, 2002. The most of the sea-salt ions were bimodally distributed in the size range of 0.8 - 30μm, however, due to contribution from land sources, calcium （Ca^2＋ ） and potassium （K^＋ ） were found to be trimodally distributed with an additional mode peaking at 0.1 - 0.8 /lm. Non-sea-salt species were found in all aerosol particles. A large part of nitrate （NO3^＋） was bimodally distributed in the size range of 0.8 - 8μm （ Dp 1.4μm and Dp4.4μm）. Non-sea-salt sulfate （nss-SO4^2-）, ammonium （ NH4 ^＋） and methanesulfonate （CH3SO^3-） were trimodally distributed in the size range of 0.1 - 10μm （nss-SO4^2- and NH4^ ＋ co-peaking at Dp 0.44μm, Do 1.4μm and Do 4.4μm, CH3SO^3- peaking at Dp 0.44μm, Dp 1.4μm and Dp 8μm）, mainly co-existing in the ultra-fine mode peaking at 0.44 μm. The mode peaking at 1.4μm was rarely reported for the nss-species in the literature. The chemical speciation of the second particulate salts in ultra-fine particles was discussed. The daily mean concentrations of nss-SO4^2-, NO^3-, NH4^＋ and CH3SO3^＋ in the TSP were 0. 279, 0. 171, 0. 158 and 0.041μg/m^3, respectively.
出处
《海洋环境科学》
CAS
CSCD
北大核心
2005年第4期41-44,47,共5页
Marine Environmental Science
基金
国家留学基金管理委员会(资助号21944021)
关键词
海岸空气
颗粒物
可溶性离子
粒径分布
air masses at coastal site
aerosol particles
water-soluble ionic species
size distributions
