Satellite-derived normalized difference convection index for typhoon observations

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题名:	Satellite-derived normalized difference convection index for typhoon observations
作者:	林唐煌;Liu, Chung-Chih;Shyu, Tian-Yow;Lin, Tang-Huang;Liu, Chian-Yi
贡献者:	太空及遙測研究中心
日期:	2015-01-01
上传时间:	2026-04-21 14:32:53 (UTC+8)
出版者:	SPIE;Society of Photo-Optical Instrumentation Engineers
摘要:	摘要： This study used the spectral features of the geostationary satellite infrared window channel and the water vapor channel data to calculate a new parameter, normalized difference convection index (NDCI), to help determine the overshooting areas in typhoon cloud systems and the centers and intensity of typhoons. The results showed that the two-dimensional NDCI analysis helped to identify typhoon convective cloud systems and the positions of overshooting areas. In addition, because the NDCI values near a typhoon eye were rather significant, if a typhoon eye was formed, the NDCI cross-section analysis could help to confirm its position. When the center of a typhoon was covered by the high anvils and cirrus layers, it could still be qualitatively found through two-dimensional analysis. As for determining the intensity of typhoons, this study also tried to perform correlation analyses with NDCI and maximum sustained wind speed. The result showed that in the ranges within circles of 200 to 250 km radii with a typhoon eye as the center, the correlation between the area with the NDCI values <0 and the maximum sustained wind speed is high with a coefficient 0.7. Thus, the NDCI value could be a referential index to determine the intensity of a typhoon. 其他題名： J. Appl. Remote Sens 出版者： Society of Photo-Optical Instrumentation Engineers 出版日期： 2015-03-10 出處： Journal of applied remote sensing, 2015-03, Vol.9 (1), p.096074-096074 版權： The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI. 識別號： ISSN: 1931-3195 識別號： EISSN: 1931-3195 識別號： DOI: 10.1117/1.JRS.9.096074
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