Impact of tide induced residual current and tidal mixing on the low salinity water lens in the northeast out of the Changjiang Estuary

Zhang Wenjing; Zhu Shouxian; Li Xunqiang; Ruan Kun; Guan Weibing; Peng jian

doi:10.3969/J.ISSN.0253-4193.2014.03.002

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Zhang Wenjing, Zhu Shouxian, Li Xunqiang, Ruan Kun, Guan Weibing, Peng jian. Impact of tide induced residual current and tidal mixing on the low salinity water lens in the northeast out of the Changjiang Estuary[J]. Haiyang Xuebao, 2014, 36(3): 9-18. doi: 10.3969/J.ISSN.0253-4193.2014.03.002

Citation:

Zhang Wenjing, Zhu Shouxian, Li Xunqiang, Ruan Kun, Guan Weibing, Peng jian. Impact of tide induced residual current and tidal mixing on the low salinity water lens in the northeast out of the Changjiang Estuary[J]. Haiyang Xuebao, 2014, 36(3): 9-18. doi: 10.3969/J.ISSN.0253-4193.2014.03.002

Citation:

Zhang Wenjing, Zhu Shouxian, Li Xunqiang, Ruan Kun, Guan Weibing, Peng jian. Impact of tide induced residual current and tidal mixing on the low salinity water lens in the northeast out of the Changjiang Estuary[J]. Haiyang Xuebao, 2014, 36(3): 9-18. doi: 10.3969/J.ISSN.0253-4193.2014.03.002

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Impact of tide induced residual current and tidal mixing on the low salinity water lens in the northeast out of the Changjiang Estuary

doi: 10.3969/J.ISSN.0253-4193.2014.03.002

1.
College of Meteorogy and Oceanography, PLA University of Science and Technology, Nangjing 211101, China
2.
College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
3.
State Key Laboratary of Satellite Ocean Environment Dynamics, Hangzhou 310012, China

Received Date: 2012-10-23
Rev Recd Date: 2013-08-14

Abstract

Abstract

The expansion of the Changjiang diluted water (CDW) is a dominant hdrographic phenomenon in the East China Sea,which is mainly in the shape of plume. However,there are some low salinity water lenses (LSWL) in partial time of some years. The effects of wind,runoff,Taiwan Warm Current,tide and baroclinic instability on LSWL have been discussed in the previous studies. Tide induced residual current and tidal mixing may both make effect on CDW and LSWL,but there are lack of discussions on the former. In this paper,some numerical simulations are made to analyze the dynamic mechanism of LSWL in August 1983,and more discussions are put on the effects of tide induced residual current and tidal mixing. Tide induced Lagrange current drove part of CDW northward from the river mouth,then turned it eastward in the shape of tongue near 32°N,which was helpful for forming LSWL in the northeast out of the estuary. Tidal vertical mixing strengthened from neap tide to spring tide,the surface salinity at the shallow water increased faster than that at the deep water,which was also helpful for forming LSWL in the northeast out of the estuary.
- Changjiang diluted water,
- low-salinity water lens,
- tide induced residual current,
- tidal mixing,
- dynamic mechanism

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References(12)

References

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