Title page for etd-0213108-173407


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URN etd-0213108-173407
Author Cai-Ming Yang
Author's Email Address m935020015@student.nsysu.edu.tw
Statistics This thesis had been viewed 5342 times. Download 1330 times.
Department Marine Biotechnology and Resources
Year 2007
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Observations of Kuroshio flows near Lanyu by using
Lowered ADCP
Date of Defense 2008-01-30
Page Count 75
Keyword
  • CTD
  • Kuroshio
  • Abstract In the last decade the lowered Acoustic Doppler Current Profiler
    (LADCP) has become an important instrument in measuring
    full-water-depth profile of velocity in the open ocean. The basic principle
    of the LADCP is to lower one or two self-contained ADCP, one looking
    downward and the other looking upward, together with the CTD rosette
    during the hydrographic cast. After careful analysis of the ADCP data it is
    possible to retrieve surface –to-bottom profile of horizontal current
    velocity. In the present study we have conducted three cruises (21-25
    April, 7-10 July and 11-13 October of 2007) in the Lanyu area to survey
    the Kuroshio flow structure by using the first set of LADCP in Taiwan. A
    total of 34 LADCP/CTD casts were completed. The results indicate that a
    major branch of the Kuroshio is located at the region between Taiwan and
    Lanyu, with a seasonal variation of flow intensity and vertical extent.
    Surface currents can reach a maximum speed of 70-140 cm/s northward.
    Kuroshio has a strongest speed (~140 cm/s) in October followed by July
    (~100 cm/s) and April (~90 cm/s). The vertical extent of the Kuroshio can
    extend to 400-m depth in October, 600-m depth in July and 400-m depth
    in April. A southward reverse current can be observed off the southeast
    Taiwan coast in depths between 200 and 800 m and the speed ranges
    between 30 and 60 cm/s. This southward flow is strongest in April (~60
    cm/s), followed by July (~40 cm/s) and October (~30 cm/s). A cyclonic,
    cold eddy was observed in the eastern side of Lanyu from the shipboard
    ADCP data during the April cruise. The Kuroshio flows to the northwest
    during ebbs and to the northeast during floods from the LADCP observations at different tidal phases in July. Finally, analysis of the
    temperature-salinity characteristics of the CTD data reveals that the South
    China Sea waters can penetrate into and mix with the Kuroshio waters
    more significantly in summertime than in other season.
    Advisory Committee
  • Chung-Pan Lee - chair
  • Y.-J. Yang - co-chair
  • Guan-Yu Chen - co-chair
  • Ruo-Shan Tseng - advisor
  • Files
  • etd-0213108-173407.pdf
  • indicate access worldwide
    Date of Submission 2008-02-13

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