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