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首页> 外文期刊>Journal of atmospheric and oceanic technology >Three-Dimensional Mapping of Fluorescent Dye Using a Scanning, Depth-Resolving Airborne Lidar
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Three-Dimensional Mapping of Fluorescent Dye Using a Scanning, Depth-Resolving Airborne Lidar

机译：使用深度解析的机载激光雷达对荧光染料进行三维映射

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摘要

Results are presented from a pilot study using a fluorescent dye tracer imaged by airborne lidar in the ocean surface layer on spatial scales of meters to kilometers and temporal scales of minutes to hours. The lidar used here employs a scanning, frequency-doubled Nd:YAG laser to emit an infrared (1064 nm) and green (532 nm) pulse 6 ns in duration at a rate of 1 kHz. The received signal is split to infrared, green, and fluorescent (nominally 580-600 nm) channels, the latter two of which are used to compute absolute dye concentration as a function of depth and horizontal position. Comparison of dye concentrations inferred from the lidar with in situ fluorometry measurements made by ship shows good agreement both qualitatively and quantitatively for absolute dye concentrations ranging from 1 to >10 ppb. Uncertainties associated with horizontal variations in the natural seawater attenuation are approximately 1 ppb. The results demonstrate the ability of airborne lidar to capture high-resolution three-dimensional "snapshots" of the distribution of the tracer as it evolves over very short time and space scales. Such measurements offer a powerful observational tool for studies of transport and mixing on these scales.
机译：结果来自一项初步研究，该研究使用的是荧光染料示踪剂，其由海洋表面层中的机载激光雷达以米至千米的空间尺度和数分钟至数小时的时间尺度成像。此处使用的激光雷达采用倍频扫描Nd：YAG激光，以1 kHz的频率发射6 ns的红外（1064 nm）和绿色（532 nm）脉冲。接收到的信号分为红外，绿色和荧光（标称580-600 nm）通道，后两个通道用于计算绝对染料浓度，作为深度和水平位置的函数。从激光雷达推断的染料浓度与船上进行的原位荧光法测量结果的比较表明，从1到> 10 ppb的绝对染料浓度，定性和定量都具有良好的一致性。与天然海水衰减水平变化相关的不确定度约为1 ppb。结果表明，机载激光雷达能够在很短的时间和空间尺度上捕获其示踪剂分布的高分辨率三维“快照”。这样的测量为研究这些规模的运输和混合提供了强大的观测工具。

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