Observational characteristics and dynamic mechanism of low-salinity water lens for the offshore detachment of the Changjiang River diluted water in August 2006 |
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| Authors: | Zhenyu Liu Wenjing Zhang Xuejun Xiong Shouxian Zhu |
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| Institution: | 1.College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China2.First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China3.College of Oceanography, Hohai University, Nanjing 211101, China |
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| Abstract: | 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 threedimensional model. The results show that:(1) winds play a crucial role in these detachment events because windinduced 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 windinduced 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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| Keywords: | Changjiang River diluted water low-salinity water lens numerical simulation observational characteristics dynamic mechanism upwelling |
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