タイトル(掲載誌)Proceedings of the CEReS international symposium = CEReS国際シンポジウム資料集
一般注記type:text
[ABSTRACT]The technique called Differential Optical Absorption Spectroscopy (DOAS) is useful for optical remote sensing, enabling measurement of atmospheric trace species over a long distance of a few kilometers [1]. The DOAS method based on a intense light source such as a xenon lamp emitting visible radiation is quite suitable for urban air pollution studies, since both nitrogen dioxide (NO2) and aerosol, the most important pollutants originated from human activities, can be directly measured using a near horizontal light path in the lower troposphere. In contrast to such active DOAS approach, the use of direct solar radiation can possibly be used for the retrieval of the same air pollution species. In this study, we describe a non-scanning, fiber-based sensor for monitoring the sunlight. Three independent optical fibers are directed toward slightly different azimuthal directions along the ecliptic, receiving the sunlight during several hours around noon. The ends of the fibers are bundled together at the surface of a diffuser plate. The scattered light from the plate is collected with a lens, and coupled to another fiber that, in tum, is connected to a high resolution spectrometer (USB 2000+). This spectrometer can transmit the data in every 100 ms to a PC for implementing the spectral analysis. The measurement was carried out on three, nearly cloud-free days on 11-13 January 2012. The spectral features in the wavelength range between 400 and 700 nm can be used for the aerosol retrieval, whereas that between 400 and 450 nm for the DOAS measurement of NO2. The resulting column values are compared with the simultaneous data taken with a collocated sunphotometer and CEReS DOAS spectrometer [1]. Also, the data obtained from nearby ground sampling stations are taken from AEROS database.
一次資料へのリンクURLhttps://opac.ll.chiba-u.jp/da/curator/106813/ceresIntlSympo-17-P114.pdf
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース(IRDB)(機関リポジトリ)