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On the Response of Radar-Derived Properties to Hygroscopic Flare Seeding

Yan YinDepartment of Geophysics and Planetary Sciences, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Israel

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Zev LevinDepartment of Geophysics and Planetary Sciences, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Israel

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Tamir G. ReisinDepartment of Geophysics and Planetary Sciences, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Israel

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Shalva TzivionDepartment of Geophysics and Planetary Sciences, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Israel

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Abstract

Numerical calculations using a cloud model with detailed microphysics are conducted to investigate the possible effects of hygroscopic flare seeding on the changes in the spectra of hydrometeors and the resulting radar-derived properties, such as storm rain mass, rain flux, and rainfall amount. The results indicate that, in continental clouds, seeding can significantly change the distribution functions of the precipitation particles, the radar reflectivity–rainfall (ZR) relationship, and the radar-derived properties. Therefore, different ZR relationships derived respectively from unseeded and seeded clouds should be used to estimate properly the effects of seeding with hygroscopic flares. The results also show that the effects of hygroscopic seeding on maritime clouds are small and there is little difference in the ZR relationship and the precipitation properties between the seeded and the unseeded cases.

* Current affiliation: School of the Environment, University of Leeds, Leeds, United Kingdom.

+ Current affiliation: Soreq Nuclear Research Center, Yavne, Israel.

Corresponding author address: Prof. Zev Levin, Dept. of Geophysics and Planetary Sciences, Tel Aviv University, Ramat Aviv 69978, Israel. zev@hail.tau.ac.il

Abstract

Numerical calculations using a cloud model with detailed microphysics are conducted to investigate the possible effects of hygroscopic flare seeding on the changes in the spectra of hydrometeors and the resulting radar-derived properties, such as storm rain mass, rain flux, and rainfall amount. The results indicate that, in continental clouds, seeding can significantly change the distribution functions of the precipitation particles, the radar reflectivity–rainfall (ZR) relationship, and the radar-derived properties. Therefore, different ZR relationships derived respectively from unseeded and seeded clouds should be used to estimate properly the effects of seeding with hygroscopic flares. The results also show that the effects of hygroscopic seeding on maritime clouds are small and there is little difference in the ZR relationship and the precipitation properties between the seeded and the unseeded cases.

* Current affiliation: School of the Environment, University of Leeds, Leeds, United Kingdom.

+ Current affiliation: Soreq Nuclear Research Center, Yavne, Israel.

Corresponding author address: Prof. Zev Levin, Dept. of Geophysics and Planetary Sciences, Tel Aviv University, Ramat Aviv 69978, Israel. zev@hail.tau.ac.il

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