Journal
MARINE POLLUTION BULLETIN
Volume 143, Issue -, Pages 242-255Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2019.04.027
Keywords
Red tide; Changjiang (Yangtze) River Estuary; Changjiang diluted water; Taiwan warm current; Plume front; Numerical model
Funding
- National Key Research and Development Program of China [2016YFC1401800, 2016YFC1402000, 2016YFC1401400, 2018YFB1502800, 2018YFB1501900]
- Taishan scholars program
- open fund of the State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, MNR [QNHX1927]
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High incident rates of red tide have occurred off the coast of the Changjiang (Yangtze) River Estuary in summer, resulting from a magnified population growth discharging substantial nutrient loads into this vicinity. The presence of elevated Chlorophyll-a concentrations (>= 36.3 mu g/l), low suspended sediment concentrations in surface and mid-layers (< 10 mg/l), a strong saline front and surface water temperature gradient, veering surface winds, and a bimodal shape to the Changjiang Diluted Water (CDW) revealed two red tide patches appearing between August 6-13, 2010. Two distinguishable hydrodynamic driving mechanisms, connected to these incidents, are diagnosed. Field observations and numerical simulations determined a red tide patch in the northeastern offshore area is caused by a northeast transport of the CDW truncated by a northwest intrusion of the Taiwan Warm Current (TWC) as winds deviated. Red tide occurrence in the southern nearshore area originated from a plume front where CDW interfaces with the TWC.
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