Statistical relationship between ISCCP cloud type and relative humidity observed by radiosonde 

作成者 Inoue, Toshiro, Kamahori, Hirotaka
日本十進分類法 (NDC) 512.75, 451
内容 研究概要:The statistical relationship between ISCCP (International Satellite Cloud Climatology Project) cloud type and relative humidity profile observed by radiosonde was studied during the period from July, 1992 to June, 1994. The ISCCP-DX data of GMS were used to compute the cloud amount for each cloud type over the 1.5 degree grid area centered at the radiosonde station. To obtain the reliable cloud type classification, the data at 00 UTC when the visible data were available were used. The radiosonde observations when the 1.5 degree grid area is covered by single cloud type were used to compare the relative humidity profile. Four cloud types of low-level, middle-level, cirrus- and cumulonimbus-type cloud were selected for the comparison. As was expected, the relative humidity was highest at all levels when the cumulonimbus-type cloud existed and was lowest at all levels when no cloud existed. The relative humidity was higher than that of a cloud-free case at middle-level (low-level) when middle-cloud (low-cloud) existed. Cirrus clouds are difficult to identify objectively from single infrared measurement. In ISCCP, however, cirrus cloud can be identified with the use of visible and infrared measurements. When cirrus cloud existed, the high level relative humidity showed local maximum and was higher than that when low- and middle-cloud existed.
コンテンツの種類 研究報告書 Research Paper
DCMI資源タイプ text
ファイル形式 application/pdf
掲載誌情報 Proceedings of the CEReS international symposium on remote sensing of the atmosphere and validation of satellite data page.69-73 (2001)
言語 英語

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