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AEROSTAR: Development of a new stellar spectroradiometer for the monitoring and characterisation of nighttime aerosols (French text).

机译:AEROSTAR:开发了一种新型恒星光谱辐射仪,用于监测和表征夜间气溶胶(法文)。

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摘要

Aerosols play an important role in atmospheric interactions and in radiative balance. Aerosols have a major effect on climate and other phenomena (like Arctic Haze). Monitoring of the fluctuating aerosol content is usually done with solar spectrophotometry, which is not possible during the night and in the polar winter.; The system presented aims to complete our observations of aerosol optical depth by making nighttime measurements. Its innovative but simple design is based on the use of a diffraction grid mounted on a robotic telescope (Meade LX200 10 inches) combined with a CCD array. This system measures the atmospheric attenuation of the emission spectrum (spectral resolution: 2.5 nm) of a star selected from a group of bright stars. The aerosol optical depth (AOD) is obtained by comparing the spectra of a pair of these stars at different apparent angular elevations and hence different air masses.; The different steps of signal processing are discussed: acquisition, measurements protocols, retrieval of the spectrum in the image, air mass calculation, spectral response and the extraction of the aerosol optical depth (AOD). The system performance, tested with selected stars: Capella, Vega, Deneb, Altaïr and Arcturus, shows the ability of this method to measure the aerosol optical depth spectrum.; Results for two sets of “golden days” (4–5 April 2001 and 6–7 May 2001) indicate that the system can make measurements of aerosol optical depth that are consistent with daytime solar spectrophotometry (±0.05 for AOD = 0.1) provided the differences in air mass between the two stars considered are greater than 1.
机译:气溶胶在大气相互作用和辐射平衡中起着重要作用。气溶胶对气候和其他现象(如北极霾)具有重大影响。波动的气溶胶含量的监测通常是通过太阳分光光度法完成的,而在夜间和极地冬季则是不可能的。提出的系统旨在通过进行夜间测量来完成对气溶胶光学深度的观测。其创新而简单的设计是基于安装在机器人望远镜(Meade LX200 10英寸)上的衍射光栅与CCD阵列的结合。该系统测量从一组明亮恒星中选出的恒星的发射光谱在大气中的衰减(光谱分辨率:2.5 nm)。气溶胶光学深度(AOD)是通过比较在不同视在角仰角和因此不同空气质量的一对这些恒星的光谱获得的。讨论了信号处理的不同步骤:采集,测量协议,图像中光谱的检索,空气质量计算,光谱响应以及气溶胶光学深度(AOD)的提取。用选定的恒星进行测试的系统性能:Capella,Vega,Deneb,Altaïr和Arcturus,表明了该方法测量气溶胶光学深度光谱的能力。两组“黄金日”(2001年4月4日至5日和2001年5月6日至7日)的结果表明,该系统可以进行与白天太阳分光光度法(AOD = 0.1的±0.05)一致的气溶胶光学深度测量。所考虑的两颗恒星之间的空气质量差异大于1。

著录项

  • 作者

    Theoret, Xavier.;

  • 作者单位

    Universite de Sherbrooke (Canada).;

  • 授予单位 Universite de Sherbrooke (Canada).;
  • 学科 Physics Atmospheric Science.
  • 学位 M.Sc.
  • 年度 2003
  • 页码 134 p.
  • 总页数 134
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 大气科学(气象学);
  • 关键词

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