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An optical particle counter (OPC) is used in conjunction with lidar measurements to examine the characteristics of the particle size distribution in cirrus cloud in the tropical tropopause layer (TTL) over Thailand where the TTL is defined as the height at which temperature is lower than ?75°C in this paper. Of 11 OPC launches, cirrus cloud was detected at 10?15 km high on 7 occasions, cirrus was detected in the TTL in 6 cases, and simultaneous OPC and lidar measurements were made on two occasions. Comparison of lidar and OPC measurements reveal that the cloud heights of cirrus in the TTL varies by several hundred meters over distances of tens kilometers; hence the height is not always horizontally uniform. The mode radii of particles constituting the clouds are estimated by lidar and OPC measurements to be less than approximately 10 μm. The regression lines of the particle size distribution with and without cirrus cloud exhibit similar features at equivalent radii of \u0026lt;0.8 μm. 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  1. 防災科研関係論文

Characteristics of aerosol and cloud particle size distributions in the tropical tropopause layer measured with optical particle counter and lidar

https://nied-repo.bosai.go.jp/records/5896
https://nied-repo.bosai.go.jp/records/5896
817bd86e-a56e-4076-bc1e-9b9ad3339c4e
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Characteristics of aerosol and cloud particle size distributions in the tropical tropopause layer measured with optical particle counter and lidar
言語
言語 eng
著者 S. Iwasaki

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en S. Iwasaki

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K. Maruyama

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en K. Maruyama

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M. Hayashi

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en M. Hayashi

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S.-Y. Ogino

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en S.-Y. Ogino

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H. Ishimoto

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Y. Tachibana

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en Y. Tachibana

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A. Shimizu

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I. Matsui

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N. Sugimoto

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en N. Sugimoto

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K. Yamashita

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en K. Yamashita

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K. Saga

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K. Iwamoto

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Y. Kamiakito

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A. Chabangborn

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en A. Chabangborn

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B. Thana

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M. Hashizume

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T. Koike

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T. Oki

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抄録
内容記述タイプ Other
内容記述 Abstract. An optical particle counter (OPC) is used in conjunction with lidar measurements to examine the characteristics of the particle size distribution in cirrus cloud in the tropical tropopause layer (TTL) over Thailand where the TTL is defined as the height at which temperature is lower than ?75°C in this paper. Of 11 OPC launches, cirrus cloud was detected at 10?15 km high on 7 occasions, cirrus was detected in the TTL in 6 cases, and simultaneous OPC and lidar measurements were made on two occasions. Comparison of lidar and OPC measurements reveal that the cloud heights of cirrus in the TTL varies by several hundred meters over distances of tens kilometers; hence the height is not always horizontally uniform. The mode radii of particles constituting the clouds are estimated by lidar and OPC measurements to be less than approximately 10 μm. The regression lines of the particle size distribution with and without cirrus cloud exhibit similar features at equivalent radii of <0.8 μm. Enhancement in the integrated number concentration at radii greater than 0.8 μm indicates that liquid particles tend to be frozen at a radius of 0.8 μm, with cirrus clouds above 10 km exhibiting similar features. On the other hand, enhancement in the particle size distribution at radii greater than 0.9 μm and a peak at around 0.8 μm in the ratio of the standard deviation of count values to that of the Poisson distribution of the averaged count values are common features of cirrus clouds in the TTL, where the ratio shows the vertical homogeneity of the particle number. These typical features suggest that the transition from liquid, sulfuric acid aerosol, to ice is more observable in the TTL and the timing of freezing may vary with height in the TTL.
言語 en
書誌情報 en : Atmospheric Chemistry and Physics

巻 7, 号 13, p. 3507-3518, 発行日 2007-07-03
出版者
言語 en
出版者 Copernicus GmbH
ISSN
収録物識別子タイプ EISSN
収録物識別子 1680-7324
DOI
関連識別子 10.5194/acp-7-3507-2007
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