High frequency current fluctuations and cross-shelf flows around the pycnocline near the shelf break in the East China Sea

I. S. Han, K. Kamio, Takeshi Matsuno, A. Manda, Atsuhiko Isobe

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Abstract

Relation between internal waves with short time scale and density distribution near the shelf break in the East China Sea is studied utilizing moored current meters, thermometers and conductivity-temperature-depth (CTD) casts. A well developed pycnocline was frequently observed around 150-200 m depth near the shelf break accompanied with the development of internal waves with short time scale. During the cruise in May 1998, the intensified internal wave motion with short time scale and the distinct offshore flow were observed just below the lower pycnocline, which shoaled and extended above the shelf area. It is suggested that vertical mixing generated by amplified internal waves would produce cross-shelf ageostophic density current around the pycnocline. During the cruise in May 1999, on the other hand, the lower pycnocline was located offshore below the shelf break, and the internal wave motion was amplified just above the lower pycnocline. In this case, the offshore flow should be generated above the lower pycnocline, but vertical profiles of current velocity were not obtained because acoustic Doppler current profiler (ADCP) data were not available around the lower pycnocline.

Original languageEnglish
Pages (from-to)235-249
Number of pages15
JournalJournal of Oceanography
Volume57
Issue number2
DOIs
Publication statusPublished - Jun 26 2001

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All Science Journal Classification (ASJC) codes

  • Oceanography

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