Observation of near-inertial internal waves in the abyssal Japan Sea

• SENJYU Tomoharu

  Division of Earth Environment Dynamics, Research Institute for Applied Mechanics, Kyushu University

Bibliographic Information

Other Title

• 日本海深層における近慣性内部波の観測

Abstract

Observation with a moored Acoustic Doppler Current Profiler (ADCP) set to a very short measurement interval revealed vertical propagation of near-inertial internal waves (NIW) in the abyssal Yamato Basin in the Japan Sea. Flow and temperature measurements showed a sinusoidal variation having near-inertial period associated with NIW. From the polarization of flow vectors, vertical and horizontal wave numbers of the NIW were estimated to be 1.741×10^-3m^-1 and 2.563×10^-4m^-1 respectively. Phase propagation of the NIW was downward at speed of 5.34×10^-2ms^-1 indicating an upward group velocity. Back-tracing of the energy ray path of NIW passing through the observation point shows that the observed NIW were the bottom-reflected waves. The bottom reflected waves were the downward-propagating NIW generated in the upper layer. An event of clockwise rotation of wind vectors was suggested as a cause of the observed NIW.

Journal

• La mer

  La mer 53 (3-4), 43-51, 2015

  The Japanese-French Oceanographic Society

Keywords

• Yamato Basin
• ADCP
• short measurement intervals
• vertical propagation

Details

• CRID: 1390855511124963072
• NII Article ID: 40020749561
• NII Book ID: AN00019968
• DOI: 10.32211/lamer.53.3-4_43
• ISSN: 24342882
• ISSN: 05031540
• NDL BIB ID: 027146274
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I027146274
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed