Japan Geoscience Union Meeting 2019

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[J] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS16] Dynamics of eruption cloud and cumulonimbus; modelling and observation

Thu. May 30, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Eiichi Sato(Meteorological Research Institute), Fukashi Maeno(Earthquake Research Institute, University of Tokyo), Takeshi Maesaka(National Research Institute for Earth Science and Disaster Resilience)

[MIS16-P07] Characteristics of polarimetric radar parameters of dry volcanic ash clouds

*Yura Kim1, Masayuki Maki1, Masato Iguchi2, Dong-In Lee3 (1.Research and Education Center for Natural Hazards, Kagoshima University, Korimoto, Kagoshima, Japan, 2.Sakurajima Volcano Research Center/DPRI, Kyoto University, Sakurajima, Kagoshima, Japan, 3.Department of Atmospheric Sciences, Pukyong National University, Namgu, Busan, Republic of Korea)

Keywords:polarimetric radar parameters, volcanic ash, statistical analysis

We analyzed statistically the polarimetric radar data of 9 Sakurajima volcanic eruption clouds in 2013. All eruption clouds have a height exceeding 3000m. According to the results, ZH has positively skewed distributions (Skewness of 1.6; mean ZH of 9.77 dBZ and median of 7.4 dBZ), ZDR has normal distributions (Skewness of 0.02; mean ZDR of 1.58 dB and median of 1.6 dB), KDP has positively skewed distributions (Skewness of 7.12; mean KDP of 0.03 deg/km and median of 0.0 deg/km), and ρhv has negatively skewed distributions (Skewness of -1.02; mean ρhv of 0.77 and median of 0.8). Depending on time after the eruption, the average ZH decreased from 22.3 dBZ to 6.75 dBZ while the average ZDR and ρhv tended to increase from 1.24 dB to 1.67 dB, and from 0.47 to 0.83, respectively.