海盐颗粒物光散射特性的理论和实验研究

大气与环境光学学报 ›› 2014, Vol. 9 ›› Issue (3): 215-222.

海盐颗粒物光散射特性的理论和实验研究

李燕1,薛锐2, Michael J. Ezell3, Barbara J. Finlayson-Pitts3

（1 南京理工大学化工学院应用化学系, 江苏南京 210094;
2 南京工程学院能源与动力学院, 江苏南京 210006;
3 Department of Chemistry, University of California, Irvine, CA 92697-2025, USA)

收稿日期:2013-10-29 修回日期:2013-11-14 出版日期:2014-05-28 发布日期:2014-05-21
通讯作者: 李燕（1975-）女，山西人，博士，副教授，主要从事光谱技术在大气环境监测和燃烧爆炸中的应用，以及大气气溶胶方面的研究工作。 E-mail:yanli@njust.edu.cn
作者简介:李燕（1975-）女，山西人，博士，副教授，主要从事光谱技术在大气环境监测和燃烧爆炸中的应用，以及大气气溶胶方面的研究工作。
基金资助:
国家自然科学基金（21207066）资助

Theoretical and Experimental Investigation of Scattering Property of Airborne Sea Salt Particle

LI Yan1, XUE Rui2, Michael J. Ezell3, Barbara J. Finlayson-Pitts3

(1 Department of Applied Chemistry, School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2 College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
3 Department of Chemistry, University of California, Irvine, CA 92697-2025, USA)

Received:2013-10-29 Revised:2013-11-14 Published:2014-05-28 Online:2014-05-21

摘要/Abstract

摘要：

以海洋区域大气中主要的无机盐颗粒物NaNO3和NaCl为例，研究大气中??蒎唏与O3光化学反应生成的低挥发性二次气溶胶（SOA）包覆无机盐颗粒物后，对其光散射性质的影响。采用TSI 3563积分浊度仪测量包覆前后的气溶胶颗粒物对450 nm，550 nm和700 nm光的散射能力，同时采用经典的Mie核-壳双层结构光散射理论预测光散射系数。研究结果表明，当SOA包覆层的厚度相对于无机盐颗粒物的直径非常小时，采用Mie核-壳理论模型能够很好地预测有机包覆层对核光散射性质的影响。当无机盐颗粒物的直径一定、有机物的相对含量增加时，光散射能力将会降低，相对于纯的盐颗粒物，这将减轻它们对能见度的影响，但是也会抵消由于温室气体引起的对流层变暖。

关键词: 光散射, 海盐颗粒物, 二次有机气溶胶, 粒径

Abstract:

In the case of NaNO3 and NaCl, airborne salt particles from the ocean and alkaline lakes, the effect of inorganic salt particles with and without organic coating resulting from the low volatility products of the reaction of ?-pinene with ozone at room temperature at 1 atm in air on light scattering was reported. Light scattering at 450 nm, 550 nm and 700 nm was measured by using TSI 3563 integrating nephelometer on particles whose size distribution was independently determined by using a scanning mobility particle sizer (SMPS). The measured values were compared with the calculated results through Mie theory. The results show that as salt takes up low volatility organics in the atmosphere and the geometric mean diameter increases, the effect on light scattering may be well predicted from the change in size distribution under conditions when the organic coating is small relative to the core size. However, for a given particle diameter, light scattering decreases as the relative contribution of the organic component increases. Thus, light scattering by salt particles with a specific size distribution will be reduced when organics comprise a significant portion of the particles. This will lessen their impact on the visual range compared to pure salt particles, but also lead to less counterbalancing of the troposphere warming due to greenhouse gases.

Key words: light scattering, sea salt, secondary organic aerosol, particle size

中图分类号:

P422.3

李燕薛锐 Michael J. Ezell Barbara J. Finlayson-Pitts. 海盐颗粒物光散射特性的理论和实验研究[J]. 大气与环境光学学报, 2014, 9(3): 215-222.

LI Yan, XUE Rui, Michael J. Ezell, Barbara J. Finlayson-Pitts. Theoretical and Experimental Investigation of Scattering Property of Airborne Sea Salt Particle[J]. Journal of Atmospheric and Environmental Optics, 2014, 9(3): 215-222.

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