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首页> 外文期刊>Geochemistry: Exploration, Environment, Analysis >Scanning lidar: a means of characterizing the Noranda-Hornesmelter plume
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Scanning lidar: a means of characterizing the Noranda-Hornesmelter plume

机译：扫描激光雷达：表征Noranda-Hornesmelter羽流的一种方法

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The Meteorological Service of Canada has recently developed a mobile scanning lidar facility (RASCAL: Rapid Acquisition SCanning Aerosol Lidar) capable of fast azimuth and elevation scanning profiles of the lower troposphere. Lidar is a remote sensing technique that provides high temporal and spatial information on atmospheric particulates and was ideally suited for characterizing stack plume dynamics. RASCAL was located predominantly downwind of the Noranda-Horne smelter stack source located in northern Quebec. Two three-week periods during February (winter) and July/August (summer) of 2000 were chosen to examine the behaviour of the plume because of the differences in humidity and boundary layer dynamics. The scanning speeds were adjusted to allow a complete scanning profile to be collected within 30–60 seconds. Along-plume-axis and cross-sectional scans provided an opportunity to directly measure plume dynamics and interaction with the planetary boundary layer, including the ability to detect fumigation events. Several algorithms have been developed to quantify the area, shape, horizontal and vertical extents of the plume as a function of the distance from source. Examples are shown where the cross-sectional area of the plume remained constant at a given distance from source even though its shape was highly variable. Also, boundary layer height, wind speed and direction of the plume can be extracted from the RASCAL data under certain conditions. These data are valuable for comparison with model predictions as well as providing initialization input for long range dispersion models.
机译：加拿大气象局最近开发了一种 激光扫描仪设施（RASCAL：Rapid Acquisition SCanning气溶胶激光雷达），能够快速进行方位角和仰角扫描。对流层下部的剖面。激光雷达是一种远程 传感技术，可提供有关大气微粒的高时空信息 ，非常适合表征 烟囱羽流动力学。 RASCAL主要位于魁北克北部 的Noranda-Horne冶炼厂烟囱源的顺风 。由于湿度和边界的差异，选择了2000年2月（冬季）和 7月/ 8月（夏季）的两个三周时间来检查羽流的行为。 图层动态。调整扫描速度以允许在30–60 秒内收集完整的 扫描配置文件。沿软轴和截面扫描提供了 机会，可以直接测量羽流动力学和与行星边界层的相互作用 ，包括 检测熏蒸事件。已经开发了几种算法 来量化羽流的面积，形状，水平和垂直范围 作为到源的距离的函数。示例 显示了在与源相距给定距离的情况下，羽流的横截面面积保持 不变，即使其形状 高度可变。同样，在某些条件下，可以从RASCAL 数据中提取边界层高度，风速 和羽流方向。这些数据对于与模型预测进行比较 以及为远程分散模型提供初始化输入 都是有价值的。

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