Cloud Observation by Visible/Infrared Imager and Microwave Radiometer 

作成者 Masunaga, Hirohiko, Nakajima, Takashi Y., Kachi, Misako, Oki, Riko, Kuroda, Shunsuke, 中島, 映至
作成者の別表記 Nakajima, Teruyuki
日本十進分類法 (NDC) 512.75, 451.2, 450
内容 研究概要:The global distribution of microphysical properties of water clouds is investigated on the basis of satellite-retrieved spectral radiances over wide wavelength range from visible to microwave. Following our previous study using ISCCP and SSM/I data, the results from the Tropical Rainfall Measuring Mission (TR.MM) data are presented employing Visible and Infrared Scanner (VIRS) and TRMM Microwave Imager (TMI). Use of the TRMM sensors has the advantage that highly simultaneous observation is possible in comparison with analysis of combined data, from sensors on different platforms such as ISCCP and SSM/I. Combination of visible and near-infrared radiances, denote by Vis-NIR method, can retrieve cloud microphysical parameters such as the cloud optical thickness and effective droplet radius. The effective droplet radius can be obtained also from visible and microwave radiances (Vis-Mic method) by combining the optical thickness and the liquid water path. The effective radius retrieved by Vis-NIR, method may tend to be biased toward the value near the cloud top due to strong abortion in the near-infrared wavelengths, while Vis-Mic would yield the effective radius averaged throughout the vertical extent of clouds. The basic idea is to find a characteristic difference between the global distributions of effective cloud droplet radii from Vis-NIR and Vis-Mic methods. The difference would be caused in part by vertical inhomogeneity of droplet size within clouds, and therefore is expected to be a possible indicator of occurrence of drizzle.
コンテンツの種類 研究報告書 Research Paper
DCMI資源タイプ text
掲載誌情報 Proceedings of the CEReS international symposium on remote sensing of the atmosphere and validation of satellite data page.110-113 (2001)
言語 英語

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