南海季風實驗整合計畫─(子計畫四)黑潮對南海北部環流之影響
Date Issued
1999
Date
1999
Author(s)
莊文思
DOI
882611M002013AP7
Abstract
Kuroshio, the western boundary current
in the Pacific Ocean, originates from North
Equatorial Current, forms a concentrated,
northward flow east of Luzon Islands. The
coast of Luzon ends at Luzon Strait, and the
Kuroshio suddenly loses its lateral boundary
support, till it feels the east coast of Taiwan
300 km downstream. The Kuroshio also
meets rough topography at the opening of
the Channel. Conceivably, the flow field
must adjust itself by separation of flow
and/or eddies in order to be remaining
dynamically stable.
Since late 1996, we have deployed a
number of ADCP moorings in the deepest
part of the Bashi Channel, as part of the
SCSMEX program. Though we encountered
many difficulties, mainly from exceptionally
strong tidal currents down to at least 1000m
depth, the data we collected over 1½ -year
clearly showed a branch of Kuroshio exists
in the Channel without significant seasonal
fluctuations.
After separation from the main stream,
this branch of Kuroshio finds its way into
the South China Sea. Past hydrographic
surveys have identified different scale of
2
eddies which constitute the major
circulation pattern in the junction of Taiwan
Strait and northern part of the South China
Sea. Recent model study by Y. Hsueh
suggests that eddy spin off is associated
with meandering of the Kuroshio main
stream, and resulted in periodic motion
further downstream, as shown in the WOCE
PCM-1 measurements.
In the KUDEX project, we are
responsible for monitoring the branch of
Kuroshio in the Bashi Channel. For the
purpose of identifying the migrating of
Kuroshio axis and the intermittent nature of
the spin-off eddies, we have gained a
comprehensive picture of the behavior of
Kuroshio in the gap of Luzon and Taiwan,
and provide a clue for the current variations
in the South China Sea.
Subjects
Kuroshio
Bashi Channel
South China Sea
Publisher
臺北市：國立臺灣大學海洋研究所
Type
report
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