InSAR observation and numerical modeling of the water vapor signal during a heavy rain: A case study of the 2008 Seino event, central Japan

摘要: [1] This study reports the first detection and analysis of a localized water vapor distribution obtained using interferometric synthetic aperture radar (InSAR) during Seino heavy rain episode. The InSAR data retrieved ALOS/PALSAR emergency observations for event revealed line-of-sight (LOS) change up to 130 mm within 10 km. Based on signal, we estimated three-dimensional ray-tracing method, which indicated column nearly saturated 10 km2 area reaching from surface 9000 m above ground level. To geophysically confirm this Weather Research Forecasting (WRF) model simulations were performed, revealing deep convection that was initiated by orographic lift caused Yoro Mountains. Another simulation did not include Mountains produce convection. WRF also suggested effect hydrometeors can account approximately 20% maximum LOS but is even more than vapor.