Potential of Polarization Lidar to Profile the Urban Aerosol Phase State during Haze Episodes,Environmental Science & Technology Letters

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Potential of Polarization Lidar to Profile the Urban Aerosol Phase State during Haze Episodes
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2019-12-12 , DOI: 10.1021/acs.estlett.9b00695
Wangshu Tan ₁ , Chengcai Li ₁ , Yuechen Liu ₂ , Xiangxinyue Meng ₂ , Zhijun Wu ₂ , Ling Kang ₂ , Tong Zhu _{2,

3}

Affiliation

The phase states of atmospheric aerosol particles affect their physical, chemical, and optical properties. Particles with different phase states exhibit different viscosities and various shapes that cause differences in their scattering polarization. In this study, a novel method for inferring the phase state of submicrometer particles using the particle linear depolarization ratio (δ_p) retrieved from polarization lidar is proposed. The values of δ_p during several haze episodes showed good correlation with the in situ-measured rebound fraction and ambient relative humidity. Two case studies verify that polarization lidar has the potential to infer the phase state profiles of submicrometer particles and that the particle phase state in the upper boundary layer may differ from that near the ground during haze episodes.

中文翻译：

偏振激光雷达在霾事件中描绘城市气溶胶相态的潜力

大气气溶胶颗粒的相态会影响其物理，化学和光学性质。具有不同相态的粒子表现出不同的粘度和各种形状，从而导致其散射极化的差异。在这项研究中，用于推断使用粒子线性去极化比（δ亚微米粒子的相态的新方法_p）从偏振激光雷达检索算法。δ的值_p在几次霾天气中，与原位测量的回弹率和环境相对湿度之间显示出良好的相关性。两项案例研究证明，偏振激光雷达有可能推断亚微米颗粒的相态分布，并且在雾霾发作期间上边界层中的颗粒相态可能与地面附近的相态不同。

更新日期：2019-12-13

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