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Numerical simulation on feasibility of rain enhancement by hygroscopic seeding over kochi area, shikoku, Japan in early Summer

Urheber*innen

Kuo,  Wei-Chen
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Yamashita,  Katsuya
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Murakami,  Masataka
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Tajiri,  Takuya
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hashimoto,  Akihiro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Orikasa,  Narihiro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Kuo, W.-C., Yamashita, K., Murakami, M., Tajiri, T., Hashimoto, A., Orikasa, N. (2023): Numerical simulation on feasibility of rain enhancement by hygroscopic seeding over kochi area, shikoku, Japan in early Summer, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2215


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018576
Zusammenfassung
To investigate the feasibility of rain enhancement by cloud seeding over the target area in early summer, the effects of salt micro-powder (MP) seeding and hygroscopit flare (HF) seeding on the initial cloud microphysical structures were investigated using a detailed bin microphysics parcel model with the background atmospheric aerosol data collected from ground-based monitoring observations carried out on the windward side of the target area and seeding aerosol data collected from the coordinated flghts of seeding helicopter and in-situ measurement aircraft. Numerical seeding experiments show that size distributions of cloud droplets are broadened and onset of the rain drop formation is fastened by MP and HF seeding although MP seeding shows more remarkable seeding effects than HF seeding. MP seeding increases the mean droplet size and decreases total number concentration of cloud droplets whereas HF seeding does vice versa. According to the relationship between the increase/decrease ratio of cloud droplet number concentration and the increase/decrease ratio of surface precipitation by hygroscopic seeding obtained in previous studies, it is shown that MP seeding has a positive seeding effect, and HF seeding has a negative effect. In the numerical seeding experiments, although a range of variation in the number concentration and hygroscopicity of background aerosol particles, the amount of seeding material applied, and the change in the physico-chemical properties of the seeding aerosols for an improvement of seeding effects were also considered, the outline of the results described above remained unchanged.