지상 및 위성 고분해 적외스펙트럼 센서에서 관측된 황사 특성
Infrared Spectral Signatures of Dust by Ground-based FT-IR and Space-borne AIRS
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Abstract
The intensive dust observation experiment has been performed at Korea Global Atmosphere Watch Center (KGAW) in Anmyeon, Korea during each spring season from 2007 to 2009. Downward and upward hyper-spectral spectrums over the dust condition were measured to understand the hyper-spectral properties of Asian dust using both ground-based Fourier Transform Infrared Spectroscopy (FT-IR) and space-borne AIRS/Aqua. To understand the impact of the Asian dust, a Line-by-Line radiative transfer model runs to calculate the high resolution infrared spectrum over the wave number range of 500-1500cm-1. Furthermore, the radiosonde, a PM10 Sampler, a Micro Pulse Lidar (MPL), and an Aerodynamic Particle Sizer (APS) are used to understand the vertical profile of temperature and humidity and the properties of Asian dust like concentration, altitude of dust layer, and size distribution. In this study, we found the Asian dust distributed from surface up to 3-4km and volume concentration is increased at the size range between 2 and 8㎛. The observed dust spectrums are larger than the calculated clear sky spectrums by 15~60K for downward and lower by around 2~6K for upward in the wave number range of 800-1200cm-1. For the characteristics of the spectrum during the Asian dust, the downward spectrum is revealed a positive slope for 800-1000cm-1 region and negative slope over 1100-1200cm-1 region. In the upward spectrum, slopes are opposed to the downward one. It is inferred that the difference between measured and calculated spectrum is mostly due to the contribution of emission and/or absorption of the dust particles by the aerosol amount, size distribution, altitude, and composition.
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