David Grégory, Thomas Benjamin, Dupart Yoan, D'Anna Barbara, George Christian, Miffre Alain, Rairoux Patrick
Opt Express. 2014 May 5;22 Suppl 3:A1009-22. doi: 10.1364/OE.22.0A1009.
Understanding new particles formation in the free troposphere is key for air quality and climate change, but requires accurate observation tools. Here, we discuss on the optical requirements ensuring a backscattering device, such as a lidar, to remotely observe nucleation events promoted by nonspherical desert dust or volcanic ash particles. By applying the Mie theory and the T-matrix code, we numerically simulated the backscattering coefficient of spherical freshly nucleated particles and nonspherical particles. We hence showed that, to remotely observe such nucleation events with an elastic lidar device, it should operate in the UV spectral range and be polarization-resolved. Two atmospheric case studies are proposed, on nucleation events promoted by desert dust, or volcanic ash particles. This optical pathway might be useful for climate, geophysical and fundamental purposes, by providing a range-resolved remote observation of nucleation events.
了解自由对流层中的新粒子形成是空气质量和气候变化的关键，但需要精确的观测工具。在此，我们讨论确保后向散射设备（如激光雷达）远程观测由非球形沙漠尘埃或火山灰颗粒引发的成核事件的光学要求。通过应用米氏理论和T矩阵代码，我们对球形新生成核粒子和非球形粒子的后向散射系数进行了数值模拟。因此，我们表明，要使用弹性激光雷达设备远程观测此类成核事件，它应在紫外光谱范围内运行并具有偏振分辨能力。本文提出了两个大气案例研究，分别涉及由沙漠尘埃或火山灰颗粒引发的成核事件。通过提供对成核事件的距离分辨远程观测，这种光学途径可能对气候、地球物理和基础研究目的有用。
