Volume 40 Issue 3
Apr.  2021
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Zhenyu Liu, Wenjing Zhang, Xuejun Xiong, Shouxian Zhu. Observational characteristics and dynamic mechanism of low-salinity water lens for the offshore detachment of the Changjiang River diluted water in August 2006[J]. Acta Oceanologica Sinica, 2021, 40(3): 34-45. doi: 10.1007/s13131-021-1710-9
Citation: Zhenyu Liu, Wenjing Zhang, Xuejun Xiong, Shouxian Zhu. Observational characteristics and dynamic mechanism of low-salinity water lens for the offshore detachment of the Changjiang River diluted water in August 2006[J]. Acta Oceanologica Sinica, 2021, 40(3): 34-45. doi: 10.1007/s13131-021-1710-9

Observational characteristics and dynamic mechanism of low-salinity water lens for the offshore detachment of the Changjiang River diluted water in August 2006

doi: 10.1007/s13131-021-1710-9
Funds:  The National Natural Science Foundation of China under contract No. 41376012.
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  • Corresponding author: E-mail: zhangwj-lgd@sohu.com
  • Received Date: 2020-04-13
  • Accepted Date: 2020-06-22
  • Available Online: 2021-04-30
  • Publish Date: 2021-04-30
  • The Changjiang River diluted water (CDW) spreads into the East China Sea (ECS) primarily in a plume pattern, although in some years, low-salinity water lenses (LSWLs) detach from the main body of the CDW. In-situ observations indicate that in August 2006, a LSWL detached from the main body of the CDW near the river mouth. In this paper, the effects of winds, tides, baroclinity and upwelling on LSWLs are explored with a three-dimensional model. The results show that: (1) winds play a crucial role in these detachment events because wind-induced northerly Eulerian residual currents impose an uneven force on the CDW and cut it off, thus forming a LSWL; (2) upwelling carries high-salinity water from the lower layer to the upper layer, truncating the low-salinity water tongue vertically, which is conducive to the detachment and maintenance of LSWLs; and (3) upwelling during the evolution of a LSWL is caused by the combined effects of winds and tides. The influences of wind-induced upwelling are mainly near the shore, whereas the upwelling along the 30 m isobath is predominantly affected by tides, with the effect increasing from neap tide to spring tide.
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