Tidal modulation of the hypoxia adjacent to the Yangtze Estuary in summer. Issue 1 (15th November 2015)

• Record Type: Journal Article
• Authors: Chen, Xiaofeng; Shen, Zhenyao; Li, Yangyang; Yang, Ye
• Is Part Of: Marine pollution bulletin. Volume 100:Issue 1(2015:Nov.)
• Page Start: 453
• Page End: 463
• Publication Date: 2015-11-15
• Subjects: Hypoxia -- Yangtze Estuary -- Tide -- Residual current -- Stratification; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2015.08.005
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: The influence of tide on the distribution of hypoxia adjacent to the Yangtze Estuary was investigated using a three-dimensional hydrodynamic eutrophication model. In the absence of tide, the hypoxic areal extent increased from 5226.75 km 2 in the base model run to 19, 514.25 km 2, and it mainly occurred in the inner shelf region near the mouth of the Yangtze Estuary and in the inner part of Hangzhou Bay. During neap tide, the hypoxic areal extent further increased to cover 20, 704.50 km 2 . Hypoxia first appeared to the southeast of Hangzhou Bay. During the neap to spring tide transition, the hypoxic areal extent decreased to 2430.00 km 2 due to reduced stratification (2.65 × 10 − 3 S –2 ) and the direction of the current. The hypoxic areal extent further decreased to 2319.75 km 2 during spring tide along with increased current and reduced stratification. Also, hypoxia mainly appeared in the submarine valley. Highlights: The tidal forcing has deep impact on the hypoxia distribution morphology and structure in the Yangtze Estuary. The hypoxic areal extent during neap tide is unexpected larger than that in the absence of tidal forcing. The hypoxic water first appeared to the southeast of Hangzhou Bay during the neap tide.