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Artificial rainfall technique based on the aircraft seeding of liquid carbon dioxide near Miyake and Mikura Islands, Tokyo, Japan

2013; Society of Agricultural Meteorology of Japan; Volume: 69; Issue: 3 Linguagem: Inglês

10.2480/agrmet.69.3.8

1881-0136

Taichi MAKI, Osamu Morita, Yoshinori Suzuki, Kenji Wakimizu,

Cryospheric studies and observations

This experiment of artificial rainfall was carried out by an aircraft seeding operation of liquid carbon dioxide on Feb. 26-27, 2012, near Miyake Island of the Izu Islands in Tokyo, Japan. The development of convective clouds was significant after 0.5 to 1 h of the seeding near Miyake Island and reached to the heights of 3000 m and 4000 m on Feb. 26 and 27, respectively. Artificial clouds appeared and rain was recognized by eye around Mikura Island on Feb. 27 as a direct effect, and it was presumed that the amount of rain increased on the mountainous area. It was clearly successful that the artificial cloud echoes were recognized about 1.5 h later after the seeding on Feb. 27 as a chain-type cloud echo at east-northeast of Mikura Island on the composition radar echo of Japan Meteorological Agency as an indirect effect. The echo height reached from 3000 m to 5000 m when the artificial cloud moved to the leeward side of Miyake Island. It was recognized that the seeding rate of liquid carbon dioxide with about 5 g/s is suitable in a little inside convective cloud with an air temperature below -5°C.