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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Optical Characteristics of Forest-Fire Smoke Observed with Two-Wavelength Mie-Scattering Lidars and a High-Spectral-Resolution Lidar over Japan
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Optical Characteristics of Forest-Fire Smoke Observed with Two-Wavelength Mie-Scattering Lidars and a High-Spectral-Resolution Lidar over Japan

机译：用两波长米氏散射激光雷达和高光谱分辨率激光雷达观测的森林火灾烟气的光学特性

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References(15) Cited-By(3) Supplementary materials(5) Smoke plumes originating from a forest fire in northern Mongolia were observed with a two-wavelength (1064 nm, 532 nm) polarization (532 nm) lidar in Nagasaki at altitudes of 12 to 14 km and 3 to 10 km on June 10, 2007. Smoke from the same region was also observed in Tsukuba with a 532 nm high-spectral-resolution lidar (HSRL) at altitudes of 15 to 15.5 km on June 12, 2007. A two-wavelength data analysis method was applied to the Nagasaki data, and the extinction-to-backscatter ratio (the lidar ratio) at 532 nm was estimated to be 65 ± 5 sr (50 ± 5 sr) for the smoke at 12 to 14 km (3.5 to 4.5 km) altitudes. The particle depolarization ratio (PDR) was 0.14 ± 0.03 (0.12 ± 0.03), and the backscatter-related Angstrom exponent (BAE) between 532 nm and 1064 nm was 1.1 ± 0.2 (0.9 ± 0.1) for the high (low) altitude smoke. The optical thickness of the high (low) altitude plume was approximately 1.0 (0.03). The lidar ratio of the smoke in Tsukuba measured with the HSRL at 15 to 15.5 km was 75 ± 5 sr, and the PDR was 0.15 ± 0.04. The optical thickness was 0.03. The lidar ratio was comparable to those reported previously for forest-fire smoke in the lower troposphere. However, the PDR in the present case was two times higher, and the BAE was slightly lower. A possible explanation of the results involves mixing with solid particles such as those of ash and/or mineral dust in the strong convection found with pyrocumulonimbus. A discussion on lidar methods for characterizing smoke aerosols is also provided.
机译：参考文献（15）被引用的文献（3）补充材料（5）在长崎县海拔5毫米的长崎市，观察到源自蒙古北部森林火灾的烟羽，其偏振波为两波长（1064 nm，532 nm）偏振光（532 nm）。 2007年6月10日为12至14公里和3至10公里。2007年6月12日，在筑波地区还观察到了来自同一地区的烟雾，其中带有532 nm高光谱分辨率的激光雷达（HSRL），高度为15至15.5公里。将两个波长的数据分析方法应用于长崎的数据，对于12°C的烟雾，在532 nm处的消光/背向散射比（激光雷达比）估计为65±5 sr（50±5 sr）。至14公里（3.5至4.5公里）的高度。对于高（低）高度烟雾，颗粒去极化率（PDR）为0.14±0.03（0.12±0.03），背散射相关的埃斯特姆指数（BAE）在532 nm至1064 nm之间为1.1±0.2（0.9±0.1） 。高（低）海拔羽流的光学厚度约为1.0（0.03）。使用HSRL在15至15.5 km处测量的筑波烟雾的激光雷达比为75±5 sr，PDR为0.15±0.04。光学厚度为0.03。激光雷达比值与以前报道的对流层低层森林火灾烟雾可比。但是，当前情况下的PDR高出两倍，而BAE则略低。结果的可能解释涉及在焦积雨云发现的强对流中与诸如灰和/或矿物粉尘的固体颗粒混合。还提供了有关表征烟雾气溶胶的激光雷达方法的讨论。

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