Effects of sea level change on the upstream Kuroshio Current through the Okinawa Trough

Shuh Ji Kao, Chau-Ron Wu, Yi Chia Hsin, Minhan Dai

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Sea-level effects on the Kuroshio Current (KC) in the Okinawa Trough (OT) are examined using a 3-D ocean model. When the sea level is -135 m (for the Last Glacial Maximum), topographic high at the southernmost OT partially blocks the KC throughflow, resulting in a 43% reduction of KC inflow. Meanwhile, meandering is enhanced and deepwater ventilation is reduced. However, the KC does not migrate to the east off the OT as suggested previously. When sea level is -40 m (for the beginning of Holocene), the modeled flow pattern resembled present KC in terms of flow path and volume transport. Sea level fluctuation may act as a major control altering the KC course in the OT, leading to significant changes in horizontal and vertical water exchange. It may alter surface water properties, biogeochemistry in both water column and sediments below, potentially, downstream KC and climate over the northeast Asia.

Original languageEnglish
Article numberL16604
JournalGeophysical Research Letters
Volume33
Issue number16
DOIs
Publication statusPublished - 2006 Aug 1

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sea level
troughs
sea level change
upstream
trough
throughflow
volume transport
water exchange
biogeochemistry
Last Glacial Maximum
flow pattern
ventilation
inflow
water column
Holocene
ocean models
surface water
effect
climate
ocean

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Effects of sea level change on the upstream Kuroshio Current through the Okinawa Trough. / Kao, Shuh Ji; Wu, Chau-Ron; Hsin, Yi Chia; Dai, Minhan.

In: Geophysical Research Letters, Vol. 33, No. 16, L16604, 01.08.2006.

Research output: Contribution to journalArticle

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