An effective method for the detection of trace species demonstrated using the MetOp Infrared Atmospheric Sounding Interferometer
An effective method for the detection of trace species demonstrated using the MetOp Infrared Atmospheric Sounding Interferometer
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使用 MetOp 红外大气探测干涉仪演示了一种检测痕量物质的有效方法
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
E. Carboni
中科院分区：
文献类型：
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作者：
J. C. Walker;A. Dudhia;E. Carboni
抽象的。对于包括避免火山灾害在内的近乎实时的应用，需要快速、可靠的大气痕量物种检测方法。使用高光谱仪器的一种常见方法是测量少数目标敏感通道和背景通道之间的亮温差，以确定目标物种的存在。虽然目前的亮度温差测量方法快速、可靠，但没有充分利用高光谱仪器的光谱范围和分辨率，与测量相关的噪声仍然很高。在本文中，我们描述了一种充分利用来自高光谱探测仪的光谱信息的方法，以便在需要时以更高的灵敏度近乎实时地确定目标物种的存在。使用MetOp红外大气探测干涉仪演示了这项技术，其中考虑了两个案例研究：(A)2008年8月阿拉斯加Kasatochi火山喷发产生的二氧化硫的探测；(B)2008年5月南亚地区与农业有关的氨排放的探测。将该方法与现有的亮温差法进行了性能比较。结果发现，这些痕量物种的检测灵敏度提高了一个数量级。
Abstract. Fast and reliable methods for the detection of atmospheric trace species are needed for near-real-time applications including volcanic hazard avoidance. One common approach using hyperspectral instruments is to measure the difference in brightness temperature between a small number of target sensitive and background channels to determine the presence of the target species. Although fast and robust, current brightness temperature difference methods do not fully exploit the spectral range and resolution of hyperspectral instruments, and the noise associated with the measurements remains high. In this paper, we describe a way to make full use of the spectral information from hyperspectral sounders allowing the presence of the target species to be determined with much better sensitivity in near-real-time if required. The technique is demonstrated using the MetOp Infrared Atmospheric Sounding Interferometer considering two case studies: (a) the detection of sulphur dioxide from the eruption of the Kasatochi volcano in Alaska in August 2008, and (b) the detection of ammonia emissions related to agriculture over Southern Asia in May 2008. The performance of this method is compared against that of existing brightness temperature difference methods. It is found that the sensitivity of the detection of these trace species is improved by up to an order of magnitude.