SWIFT-DASH: Spatial Heterodyne Spectroscopy Approach to Stratospheric Wind and Ozone Measurement

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2015-01-01 DOI:10.1080/07055900.2013.855160

B. Solheim, S. Brown, C. Sioris, G. Shepherd

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引用次数: 11

Abstract

Abstract Passive wind measurements using Doppler shifts from atmospheric emissions were well demonstrated by the Wind Imaging Interferometer (WINDII) and the High Resolution Doppler Imager (HRDI) instruments on the National Aeronautics and Space Administration's (NASA's) Upper Atmosphere Research Satellite, operated from 1991 to 2005. For WINDII these emissions were from visible region upper atmospheric airglow in the altitude range from 80 to 300 km. Application of the same technique in the stratosphere requires using thermal emission from a minor constituent, and an ozone line near 1133 cm−1 (about 8.8 μm) has been identified as a suitable target line. The WINDII method employed a Doppler Michelson Interferometer, in which the wind is measured from phase shifts of a single spectral line. Isolating a single ozone spectral line is a major challenge but using Spatial Heterodyne Spectroscopy (SHS) offers a way to resolve a number of interferogram spectral components (fringes) within a narrow spectral range. The instrument is a Michelson interferometer similar to WINDII but one in which the two mirrors are replaced by diffraction gratings. A developmental instrument capable of measuring the phase shifts from several ozone lines within a spectral range of 4 cm−1 has been designed, built, and operated in the laboratory. Simulated retrievals using the measurement parameters of this instrument demonstrate the capability of wind measurement with an accuracy better than 3 m s−1 over an altitude range of 24 to 60 km. The retrieval employs four spectral lines for wind and three fringe frequencies for ozone concentration (of about 30 possible), each of which provides an optimal measurement for a particular altitude range. Ozone concentrations are also provided with an accuracy better than 10% from 20 to 50 km. Further detailed tests of this instrument are planned for the future. This work is supported by the Canadian Space Agency.

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SWIFT-DASH:平流层风和臭氧测量的空间外差光谱方法

1991年至2005年，美国国家航空航天局(NASA)高层大气研究卫星上的风成像干涉仪(WINDII)和高分辨率多普勒成像仪(HRDI)很好地证明了利用大气发射多普勒频移进行被动风测量。对于WINDII，这些排放来自80至300公里高度的可见区域高层大气辉光。在平流层应用同样的技术需要利用少量成分的热辐射，在1133 cm−1(约8.8 μm)附近的臭氧线已被确定为合适的目标线。WINDII方法采用了多普勒迈克尔逊干涉仪，通过单谱线的相移来测量风。分离单个臭氧谱线是一个重大挑战，但使用空间外差光谱(SHS)提供了一种在狭窄光谱范围内解析许多干涉图光谱成分(条纹)的方法。该仪器是一个类似于WINDII的迈克尔逊干涉仪，但其中两个镜子被衍射光栅取代。研制了一种能够在4 cm−1光谱范围内测量几条臭氧线相移的仪器，并在实验室中进行了设计、建造和操作。利用该仪器测量参数的模拟反演结果表明，在海拔24 ~ 60 km范围内，风速测量精度优于3 m s−1。反演采用四条风谱线和三条臭氧浓度谱线(大约30个可能的谱线)，每一条谱线都提供了特定高度范围的最佳测量值。在20至50公里范围内提供的臭氧浓度精度也优于10%。该仪器的进一步详细测试计划在未来进行。这项工作得到了加拿大航天局的支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.