Ceolato Romain, Bedoya-Velásquez Andrés E, Fossard Frédéric, Mouysset Vincent, Paulien Lucas, Lefebvre Sidonie, Mazzoleni Claudio, Sorensen Christopher, Berg Matthew J, Yon Jérôme
ONERA, The French Aerospace Lab, Toulouse University, 31055, Toulouse, France.
ONERA, The French Aerospace, Paris-Saclay University, CNRS, Laboratoire d'étude des microstructures, 92322, Châtillon, France.
Sci Rep. 2022 May 19;12(1):8443. doi: 10.1038/s41598-022-11954-7.
Black carbon aerosol emissions are recognized as contributors to global warming and air pollution. There remains, however, a lack of techniques to remotely measure black carbon aerosol particles with high range and time resolution. This article presents a direct and contact-free remote technique to estimate the black carbon aerosol number and mass concentration at a few meters from the emission source. This is done using the Colibri instrument based on a novel technique, referred to here as Picosecond Short-Range Elastic Backscatter Lidar (PSR-EBL). To address the complexity of retrieving lidar products at short measurement ranges, we apply a forward inversion method featuring radiometric lidar calibration. Our method is based on an extension of a well-established light-scattering model, the Rayleigh-Debye-Gans for Fractal-Aggregates (RDG-FA) theory, which computes an analytical expression of lidar parameters. These parameters are the backscattering cross-sections and the lidar ratio for black carbon fractal aggregates. Using a small-scale Jet A-1 kerosene pool fire, we demonstrate the ability of the technique to quantify the aerosol number and mass concentration with centimetre range-resolution and millisecond time-resolution.
黑碳气溶胶排放被认为是全球变暖和空气污染的成因之一。然而，目前仍缺乏能够在高量程和高时间分辨率下对黑碳气溶胶颗粒进行遥感测量的技术。本文提出了一种直接且非接触式的遥感技术，用于估算距离排放源数米处的黑碳气溶胶数量和质量浓度。这是通过基于一种新技术的科里布里仪器实现的，这里将其称为皮秒短程弹性后向散射激光雷达（PSR-EBL）。为了解决在短测量量程下获取激光雷达产品的复杂性问题，我们应用了一种具有辐射激光雷达校准功能的正向反演方法。我们的方法基于一种成熟的光散射模型——分形聚集体的瑞利-德拜-甘斯（RDG-FA）理论的扩展，该理论计算激光雷达参数的解析表达式。这些参数是黑碳分形聚集体的后向散射截面和激光雷达比。通过一个小规模的喷气A-1煤油池火，我们展示了该技术能够以厘米级的量程分辨率和毫秒级的时间分辨率对气溶胶数量和质量浓度进行量化的能力。
