Marine weather observation relevant to meteotsunamis on the East China Sea

2015 Fiscal Year Final Research Report

• Project/Area Number: 25287124
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Hiroshima Institute of Technology
• Principal Investigator: Kenji Tanaka 広島工業大学, 環境学部, 准教授 (30315288)
• Co-Investigator(Kenkyū-buntansha): NAKAJO Sota 熊本大学, 大学院自然科学研究科, 助教 (20590871) ; YAMADA Fumihiko 熊本大学, 大学院自然科学研究科, 教授 (60264280)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 気象津波 / 東シナ海 / 潮位副振動 / 気圧微変動

Outline of Final Research Achievements

Marine weather observation was conducted on the East China Sea in the winter of 2013 and 2014 to investigate the atmospheric mechanisms to generate and to enhance meteotsunamis. From the observed vertical profile data, it was revealed to form the wave ducting layers that the significance of lifting the warm moist air from the South China region along the low-level trough surrounded by a couple of the high pressure systems. One was passing eastward over the south of Japan and another was stalled over the Siberia. Under the such condition, a train of the pressure waves was generated with the duration as long as several hours. According to the tide gauge data, it was revealed that the effect of the tidal motion played important role in amplifying the secondary oscillation resulted in meteotsunamis as much as the shoreline shape of the bay and incident angle of the pressure waves.

Free Research Field

気象学