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RISS 인기검색어
- 검색키워드
- 저자 : Patric Seifert (검색결과 2 건)
- 무료
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신성균,Detlef Müller,Y.J. Kim,Boyan Tatarov,신동호,Patric Seifert,노영민 한국기상학회 2013 Asia-Pacific Journal of Atmospheric Sciences Vol.49 No.1
The linear particle depolarization ratios were retrieved from the observation with a multiwavelength Raman lidar at the Gwangju Institute of Science and Technology (GIST), Korea (35.11oN, 126.54oE). The measurements were carried out in spring (March to May) 2011. The transmission ratio measurements were performed to solve problems of the depolarization-dependent transmission at a receiver of the lidar and applied to correct the retrieved depolarization ratio of Asian dust at first time in Korea. The analyzed data from the GIST multiwavelength Raman lidar were classified into three categories according to the linear particle depolarization ratios, which are pure Asian dust on 21 March, the intermediate case which means Asian dust mixed with urban pollution on 13 May, and haze case on 10 April. The measured transmission ratios were applied to these cases respectively. We found that the transmission ratio is needed to be used to retrieve the accurate depolarization ratio of Asian dust and also would be useful to distinguish the mixed dust particles between intermediate case and haze. The particle depolarization ratios of pure Asian dust were approximately 0.25 at 532 nm and 0.14 at 532 nm for the intermediate case. The linear particle depolarization ratios of pure Asian dust observed with the GIST multiwavelength Raman lidar were compared to the linear particle depolarization ratios of Saharan dust observed in Morocco and Asian dust observed both in Japan and China.
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Lidar measurements of Raman scattering at ultraviolet wavelength from mineral dust over East Asia.
Tatarov, Boyan,Mü,ller, Detlef,Shin, Dong Ho,Shin, Sung Kyun,Mattis, Ina,Seifert, Patric,Noh, Young Min,Kim, Y J,Sugimoto, Nobuo Optical Society of America 2011 Optics express Vol.19 No.2
<P>We developed a novel measurement channel that utilizes Raman scattering from silicon dioxide (SiO<sub>2</sub>) quartz at an ultraviolet wavelength (361 nm). The excitation of the Raman signals is done at the primary wavelength of 355 nm emitted from a lidar instrument. In combination with Raman signals from scattering from nitrogen molecules, we may infer the mineral-quartz-related backscatter coefficient. This technique thus allows us to identify in a comparably direct way the mineral quartz content in mixed pollution plumes that consist, e.g., of a mix of desert dust and urban pollution. We tested the channel for the complex situation of East Asian pollution. We find good agreement of the inferred mineral-quartz-related backscatter coefficient to results obtained with another mineral quartz channel which was operated at 546 nm (primary emission wavelength at 532 nm), the functionality of which has already been shown for a lidar system in Tsukuba (Japan). The advantage of the novel channel is that it provides a better signal-to-noise ratio because of the shorter measurement wavelength.</P>
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