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首页> 外文期刊>Journal of atmospheric and oceanic technology >A Study of the Extinction-to-Backscatter Ratio of Marine Aerosol during the Shoreline Environment Aerosol Study
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A Study of the Extinction-to-Backscatter Ratio of Marine Aerosol during the Shoreline Environment Aerosol Study

机译：海岸线环境气溶胶研究过程中海洋气溶胶消光-背向散射比的研究

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摘要

Ground-based aerosol optical measurements made at near-ambient relative humidity (RH) under clean marine sampling conditions are presented and compared to 1) almost identical optical measurements made at a polluted continental site and 2) optical properties calculated from measured size distributions and Mie theory. The use of Mie theory (which assumes homogeneous spheres) is justified based on the fact that the sea-salt aerosol was measured in a hydrated state. This study focuses on the extinction-to-backscatter ratio S, an optical property required to interpret remote measurements by elastic backscatter lidar. For clean marine conditions, S is found to be 25.4 +- 3.5 sr at 532 nm (central value +- 95% confidence uncertainty). Other optical properties reported include single-scattering albedo, wavelength dependence of scattering, fraction of scattering due to submicrometer particles, and hemispheric-backscatter fraction, as well as the extensive properties (e.g., scattering coefficient) upon which these intensive properties are based. In addition, correlation scale lengths are examined via the autocorrelation function. Except during deliberate drying experiments that lowered the measurement RH below 43%, S exhibited little variation with RH. A subtle but clearly detectable change in optical properties was observed at the onset of volcanically influenced sampling conditions.
机译：介绍了在清洁的海洋采样条件下，在接近环境相对湿度（RH）下进行的地面气溶胶光学测量结果，并将其与1）在受污染的大陆站点进行的几乎相同的光学测量结果以及2）根据测量的尺寸分布和Mie计算得出的光学特性进行了比较理论。基于以水合状态测量海盐气溶胶这一事实，证明使用Mie理论（假定均质球体）是合理的。这项研究的重点是消光与后向散射比S，这是解释弹性后向散射激光雷达进行远程测量所需的光学特性。对于清洁的海洋条件，发现在532 nm处S为25.4±3.5 sr（中心值±95％置信度不确定度）。报道的其他光学性质包括单散射反照率，散射的波长依赖性，由于亚微米颗粒引起的散射分数和半球后向散射分数，以及这些强度性质所基于的广泛性质（例如散射系数）。另外，通过自相关函数检查相关标度长度。除了在故意干燥实验中将相对湿度降低到43％以下外，S随相对湿度变化不大。在受到火山影响的采样条件开始时，观察到了光学性质的细微但清晰可检测的变化。

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