Observations of Kuroshio intrusion into the South China Sea

Ze Liu; Yijun Hou; Peng Qi; Po Hu

doi:10.1007/s00343-010-9065-7

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Observations of Kuroshio intrusion into the South China Sea

Updated：2023-05-16

- Observations of Kuroshio intrusion into the South China Sea
- Journal of Oceanology and Limnology Vol. 28, Issue 5, Pages: 1012-1020(2010)
- Affiliations：
  
  1. Institute of Oceanology Chinese Academy of Sciences
  2. Key Laboratory of Ocean Circulation and Waves (KLOCAW) Chinese Academy of Sciences
  3. Graduate University of Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-010-9065-7
  CLC：
- Online First：11 September 2010，
  
  Published：2010
- Accepted：
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Liu, Z., Hou, Y., Qi, P. et al. Observations of Kuroshio intrusion into the South China Sea., Chin. J. Ocean. Limnol. 28, 1012–1020 (2010). https://doi.org/10.1007/s00343-010-9065-7
DOI：

Liu, Z., Hou, Y., Qi, P. et al. Observations of Kuroshio intrusion into the South China Sea., Chin. J. Ocean. Limnol. 28, 1012–1020 (2010). https://doi.org/10.1007/s00343-010-9065-7 DOI：

摘要

Abstract

To discuss the intrusion of the Kuroshio into the SCS

we examined the mixing between the North Pacific and South China Sea (SCS) waters based on in-situ CTD data collected in August and September 2008 and the moored ADCP data taken from mid September 2008 to early July 2009. The CTD survey included four meridional sections from 119°E to 122°E around the Luzon Strait

during which pressure

temperature

and salinity were measured. The CTD data show that the isopycnal surface tilted from the SCS to the North Pacific; and it was steeper in the lower layers than in the upper ones. Meanwhile

we found strong vertical mixing taken place in the areas near 121°E. The Kuroshio in high temperature and salinity intruded westward through Luzon Strait. The frequency of buoyancy was one order of magnitude greater than that of the common ones in the ocean

suggesting stronger stratification in the northeastern SCS. On the other hand

the long-term ADCP data show that before late October 2008

the direction of water flow in the SCS was eastward

and from November 2008 to late February 2009

it turned northwestward in the layers shallower than 150 m

while remained unchanged in deep layers from 200 to 450 m. From March to June 2009

the direction shifted with increasing depth from northward to southward

akin to the Ekman spiral. EOF analysis of the current time series revealed dominant empirical modes: the first mode corresponded to the mean current and showed that the Kuroshio intrusion occurred in the upper layers only from late December to early March. The temporal coefficient of the first and the second mode indicated clearly a dominant signal in a quasi-seasonal cycle.

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references

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