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| 临安一次沙尘暴过程影响气溶胶物理化学特性演变的初步分析 | |
| 引用本文： | 颜鹏,毛节泰,杨东贞,刘桂清,朱爱华,俞向明,刘国平.临安一次沙尘暴过程影响气溶胶物理化学特性演变的初步分析[J].第四纪研究,2004,24(4):437-446. |
| 作者姓名： | 颜鹏 毛节泰 杨东贞 刘桂清 朱爱华 俞向明 刘国平 |
| 作者单位： | 中国气象科学研究院气候与环境研究所,北京,100081;北京大学大气科学系,北京,100871;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;临安大气本底污染监测站,临安,311307 |
| 基金项目： | 国家自然科学基金重大国际合作项目 (批准号 :40 12 112 0 82 7)，科学技术部公益性研究项目 (批准号 :2 0 0 1DIAI0 0 0 9)资助 |
| 摘 要： | 文章利用2002年3月29日～4月4日在浙江临安大气本底污染监测站观测的气溶胶粒子质量谱、离子与元素成分的数据,结合TOMS卫星的气溶胶指数资料和轨迹模式,重点分析在北方沙尘暴输送影响期间临安气溶胶质量浓度尺度分布的演变特点以及气溶胶化学成分与不同空气来源的关系。初步分析结果显示,受北方沙尘暴天气影响,临安气溶胶质量浓度、离子、元素浓度有明显的尺度分布演变。这种演变与污染物来源和大气污染物的气粒转化有关。沙尘影响前和结束后临安地区气溶胶主要以细粒子为主(<2.1μm),峰值粒径0.65～2.1μm,而受北方地区的沙尘暴影响,峰值粒径偏移到2.1～3.3μm,且在7～11μm间出现另一个峰值,同时临安气溶胶粗粒子中矿物元素显著增加。从离子成分看,在整个观测期间SO2-4与NH+4在细粒子段有很好的一致性,而SO2-4,NO-3与Ca2+在粗粒子段有很好的相关,尤其是沙尘影响期间NO-3与Ca2+有很好的对应关系,表现出较明显的表面非均相反应特征 |
| 关 键 词： | 沙尘暴 质量和化学成分 尺度分布演变 |
| 文章编号： | 1001-7410(2004)04-437-11 |
| 收稿时间： | 2003-10-30 |
| 修稿时间： | 2004-03-10 |
THE CHARACTERIZATION OF AEROSOL PHYSICAL AND CHEMICAL PROPERTIESAT LIN′AN STATION DURING THE TRANSPORT OF A SANDSTORM |
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| Institution: | 1. Institute of Climate and Environment, Chinese Academy of Meteorological Sciences, Beijing 100081; 2. Atmospheric Science Department, Peking University, Beijing 100871; 3. Lin′an Regional Atmospheric Pollution Monitoring Station, Lin′an 311307 |
| Abstract: | Using the data of aerosol mass, ions and elements measured in Lin′an regional atmospheric pollution monitoring station from March 29 to April 4 of 2002, we analyzed the evolution and variations of aerosol mass and chemical composition in the case of a sand storm transport. We also discussed the relations of aerosol mass and chemical composition, grain size distribution with the source of the air mass using TOMS aerosol index and backward trajectories. The results indicated that due to the influence of sand storm occurred in northern part of China, the mass concentrations and ions and elements of aerosol at Lin′an demonstrated obvious size evolution. This evolution was related with the source of air mass and the gas-to-particle conversions. Before and by the end of the sand storm, the distributions of Lin′an aerosol were mainly in the fine particles with diameter less than <2.1μm, and showed the single peak mode with peak lying between 0 65 ～ 2 1μm, but during the sandstorm transport, the distribution changed to multi-peaks, the main peak size was shifted to 2 1 ～ 3 3μm, and the second peak at 7 ～ 11μm. Chemical composition analysis showed that with the effects of northern sandstorm, the mass concentrations of crustal elements increased sharply in the coarse particles. Generally in the whole measurement period, the SO 2- 4 and NH + 4 correlated well with each other in fine particles, while SO 2- 4, NO - 3 and Ca 2+ showed good agreement in coarse mode. The size distribution of NO - 3 and Ca 2+ was consistent at Lin′an station especially during the sandstorm, suggesting the heterogeneous chemical reactions taking place on the surface of dust particles. |
| Keywords: | sandstorm particle mass and chemical composition size distribution evolution |
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