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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Applying UV cameras for SO_2 detection to distant or optically thick volcanic plumes
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Applying UV cameras for SO_2 detection to distant or optically thick volcanic plumes

机译：将紫外线照相机用于SO_2检测到远处或光学上较厚的火山羽

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Ultraviolet (UV) camera systems represent an exciting new technology for measuring two dimensional sulfur dioxide (SO_2) distributions in volcanic plumes. The high frame rate of the cameras allows the retrieval of SO_2 emission rates at time scales of 1 Hz or higher, thus allowing the investigation of high-frequency signals and making integrated and comparative studies with other high-data-rate volcano monitoring techniques possible. One drawback of the technique, however, is the limited spectral information recorded by the imaging systems. Here, a framework for simulating the sensitivity of UV cameras to various SO_2 distributions is introduced. Both the wavelength-dependent transmittance of the optical imaging system and the radiative transfer in the atmosphere are modeled. The framework is then applied to study the behavior of different optical setups and used to simulate the response of these instruments to volcanic plumes containing varying SO_2 and aerosol abundances located at various distances from the sensor. Results show that UV radiative transfer in and around distant and/or optically thick plumes typically leads to a lower sensitivity to SO_2 than expected when assuming a standard Beer-Lambert absorption model. Furthermore, camera response is often nonlinear in SO_2 and dependent on distance to the plume and plume aerosol optical thickness and single scatter albedo. The model results are compared with camera measurements made at Kilauea Volcano (Hawaii) and a method for integrating moderate resolution differential optical absorption spectroscopy data with UV imagery to retrieve improved SO_2 column densities is discussed.
机译：紫外线（UV）相机系统代表了一种激动人心的新技术，用于测量火山羽中的二维二氧化硫（SO_2）分布。摄像机的高帧频可以在1 Hz或更高的时间尺度上检索SO_2的发射率，从而可以研究高频信号，并使与其他高数据速率火山监测技术的整合和比较研究成为可能。然而，该技术的一个缺点是成像系统记录的光谱信息有限。在这里，介绍了用于模拟UV相机对各种SO_2分布的灵敏度的框架。对光学成像系统的波长相关的透射率和大气中的辐射传递都进行了建模。然后将该框架应用于研究不同光学设置的行为，并用于模拟这些仪器对位于距离传感器不同距离的，包含变化的SO_2和气溶胶丰度的火山羽的响应。结果表明，在假定标准比尔-兰伯特吸收模型时，与远处和/或光学上较厚的羽流及其周围和周围的UV辐​​射传递通常导致对SO_2的敏感性较低。此外，相机响应在SO_2中通常是非线性的，并且取决于到烟羽的距离以及烟羽气溶胶光学厚度和单散射反照率。将模型结果与在Kilauea火山（夏威夷）进行的相机测量结果进行了比较，并讨论了将中分辨率差分光学吸收光谱数据与UV图像集成以检索改进的SO_2色谱柱密度的方法。

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