Japan Geoscience Union Meeting 2016

Presentation information


Symbol A (Atmospheric and Hydrospheric Sciences) » A-HW Hydrology & Water Environment

[A-HW17] Hydrological Cycle and Water Environment

Wed. May 25, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Atsushi Higuchi(Center for Environmental Remote Sensing (CEReS), Chiba University, Japan), Seiya Nagao(Institute of Nature and Environmental Technology, Kanazawa University), Takeshi Hayashi(Faculty of Education and Human Studies, Akita University), Youhei Uchida(Geological Survey of Japan, AIST)

5:15 PM - 6:30 PM

[AHW17-P07] Relative role of meso-alpha scale disturbance over Japan Sea on the rapid-developed low pressure near of Japan in winter

Masaki Nagai1, *Atsushi Higuchi1 (1.Center for Environmental Remote Sensing (CEReS), Chiba University, Japan)

Keywords:low pressure near of Japan in Winter , meso-scale disturbance, water vapor

In this study, we focus on the effect of meso-alpha scale disturbances (MD) on Japan-Sea Convergence Zone (JPCZ), on the rapid-developed low pressure near of Japan in boreal winter. We used for data analysis JRA-55 and MSM by JMA. To detect low system, automatic detection algorithm was applied using sea-level pressure element in JRA55. In addition, relative vorticity at 900 hPa data was used for the detection of MD. We checked strong lower-level easterly wind from warm front to Japan Sea to supply water vapor. We also conducted composite analysis with or without MD. By composite analysis, we confirmed again low-level easterly with water vapor, low system lost 23% water vapor by the presence of MD. On the other hand, it is not clear the significant difference in deepen rate of low w/wo MD. We also try to isolate by additional indicators (w MD: Q2, wo MD: precipitable water), then we can explain the effect of MD on deepen rate of low system.