[A-CG31] 航空機・無人機観測による地球惑星科学の推進

[ACG31-P03] 航空機観測を用いた雲へのシーディング実験

*折笠 成宏¹、村上 正隆^2,1、斎藤 篤思³、田尻 拓也¹、財前 祐二¹、篠田 太郎² (1.気象庁気象研究所、2.名古屋大学宇宙地球環境研究所、3.気象庁)

キーワード：雲凝結核・氷晶核、吸湿性粒子シーディング、吸湿性フレアとNaClマイクロパウダー、氷化シーディング、ヨウ化銀フレアとドライアイスペレット

As one of the physical evaluation techniques of cloud seeding effects, we have conducted several field campaigns for cloud seeding experiment utilizing an instrumented aircraft in Japan and in the United Arab Emirates. The seeding agents used were dry-ice pellets and silver iodide flares in cold clouds and hygroscopic flares and salt micro-powders in warm clouds.

We demonstrate from the in-situ measurements that dry-ice pellet seeding of mixed-phase orographic clouds were effective, based on the comparison of estimated radar reflectivity factor, ice water content, or precipitation intensity from the 2D images of ice particles between seeded regions and their surroundings.

The observational results we obtained so far showed that hygroscopic seeding of warm clouds might be effective under limited conditions. The size distributions of cloud droplets near the cloud base were compared between seeded cloud regions and unseeded regions.

The flare seeding plumes generated in midair were sampled and measured with the instrumented aircraft. The size distributions and CCN and INP abilities of those particles in different types of flares are presented.