Study on the variability with periods from months to years in the deep ocean

2014 Fiscal Year Final Research Report

• Project/Area Number: 24540468
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: The University of Tokyo
• Principal Investigator: FUJIO Shinzou 東京大学, 大気海洋研究所, 准教授 (00242173)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 深層循環 / 係留流速計 / 流速変動

Outline of Final Research Achievements

Data analysis was performed on 2000-day-long time series of the deep current velocity to the east of Tohoku, Japan. Variability is dominant widely at the periods from three to six months, and weak at the annual and longer periods. As a result, year-long mean velocities are rather constant. Near the Japan Trench, the phase propagation is clearly identified along it, and above the abyssal plain, it seems westward. A good agreement of energy spectra with a two-layer model simulation driven only by surface wind suggests the variability is caused mainly by wind.

Free Research Field

海洋物理学