Japan Geoscience Union Meeting 2015

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Oral

Symbol S (Solid Earth Sciences) » S-VC Volcanology

[S-VC46] Dynamics of volcanic eruptions and igneous activities

Mon. May 25, 2015 11:00 AM - 12:45 PM 304 (3F)

Convener:*Tomofumi Kozono(Department of Geophysics, Graduate School of Science, Tohoku University), Yujiro Suzuki(Earthquake Research Institute, The University of Tokyo), Satoshi Okumura(Division of Earth and Planetary Materials Science, Department of Earth Science, Graduate School of Science, Tohoku University), Chair:Tomofumi Kozono(Department of Geophysics, Graduate School of Science, Tohoku University)

11:50 AM - 12:05 PM

[SVC46-16] MP radar observation of the explosive eruption of Sakurajima on May 10th, 2014

*Eiichi SATO1, Keiichi FUKUI1, Toshiki SHIMBORI1, Kensuke ISHII1, Akimichi TAKAGI1, Hiroshi YAMAUCHI1, Masayuki MAKI2 (1.Meteorological Research Institute, 2.Kagoshima University)

Keywords:volcanic plume, MP radar, polarimetric radar, false echo

Although it has been recognized that volcanic ash clouds can be captured by weather radars from the late 1960s, the technique to estimate the amount of pyroclastic materials is not established now. On the other hand, MP (polarimetric) weather radar techniques have been rapidly developed in the field of Quantitative Precipitation Estimation (QPE) and Hydrometeor Classification (HC). We are now trying to develope Quantitative Ash Estimation (QAE) techniques by MP radar, however, false echo is one of the obstacles of QAE.
In this research, we tested a method of determination of false echo region by correlation coefficient (ρhv), which represents non-homogeneity of meteorological clutters, to the case of explosive eruption of Sakuraijma on May 10th, 2014. Then, we analyzed frequency distributions of polarimetric parameters in the volcanic plume regions and the false echo regions. As a result, it is considered that the false echo region depended on multiple factors.