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

Iwasaki S, Maruyama K, Hayashi M, Ogino S, Ishimoto H, Tachibana Y, Shimizu A, Matsui I, Sugimoto N, Yamashita K, Saga K, Iwamoto K, Kamiakito Y, Chabangborn A, Thana B, Hashizume M, Koike T, Oki T...(+18 more)

Atmospheric Chemistry and Physics, vol. 7, issue 13 (2007) pp. 3507-3518

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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 -75C 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 10mm. The regression lines of the particle size distribution with and without cirrus cloud exhibit similar features at equivalent radii of

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