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- Title
Influence of Suspended Aquaculture on Hydrodynamics and Nutrient Supply in the Coastal Yellow Sea.
- Authors
He, Yuqing; Xuan, Jiliang; Ding, Ruibin; Shen, Hui; Zhou, Feng
- Abstract
Effects of aquaculture on hydrodynamics and associated nutrient supply in a typical aquaculture area of the coastal Yellow Sea are investigated with high‐resolution model experiments and in situ data. The results show a significant reduction in nutrient supply, which is associated with alternations of three hydrodynamic conditions: the onshore current across the outer‐boundary of aquaculture area, upwelling within the offshore (depth >10 m) aquaculture area, and water exchange in the near‐coastal (depth <10 m) aquaculture area. First, the onshore current in the bottom layer of the aquaculture boundary, which transports high‐concentration nutrients from the major nutrient source of offshore bottom water, is significantly weakened by suspended aquaculture. As a result, nutrient supply from offshore sources is reduced by 50%−60%. Second, the upwelling velocities in the offshore aquaculture area are reduced by 2–6 × 10−3 cm/s, which leads to an approximately 25% reduction in nutrient supply to the euphotic layer. Third, the water exchange in the near‐coastal aquaculture area remains approximately unchanged because the weakened onshore currents within the aquaculture layers (0–4 m) are compensated by the enhanced onshore currents in the lower layers. As a result, the nutrient supply in the near‐coastal aquaculture area does not significantly change, whereas the nutrient supply in the offshore aquaculture area has been reduced by approximately 60%. Plain Language Summary: Coastal aquaculture has become the largest source of seafood for human consumption in many countries, and China contributes 60% of global aquaculture production. As the largest contributor to Chinese aquaculture production, the coastal aquaculture sites in the Yellow Sea have expanded to depths between 20 and 30 m in recent years, while excessive aquaculture results in nutrient deficiency that has been associated with weakened hydrodynamics. Through nutrient observations and high‐resolution simulations at a typical aquaculture site, we investigated the impact of suspended aquaculture on hydrodynamics and the associated nutrient supply in the coastal aquaculture area of the Yellow Sea (China). Our results show that a significant reduction in nutrient supply, which is associated with alterations in onshore currents across the aquaculture boundary, upwelling within the offshore (>10 m) aquaculture area, and water exchange in the near‐coastal (<10 m) aquaculture area. Specifically, suspended aquaculture weakens the onshore current near the aquaculture boundary and upwelling within the offshore aquaculture area and changes the vertical distribution of the onshore currents near the bay boundary. As a result, approximately 60% of the high‐nutrient water in the offshore aquaculture area is reduced. Key Points: Suspended aquaculture weakens the onshore current near the aquaculture boundary, resulting in a reduction of 50%−60% in nutrient supplyNutrient supply to the euphotic layer is further reduced by approximately 25% owing to weakened upwelling in the offshore aquaculture areaNutrient supply in near‐coastal area does not significantly change mainly because onshore current remains unchanged
- Subjects
YELLOW Sea; AQUACULTURE; HYDRODYNAMICS; VERTICAL distribution (Aquatic biology); EUPHOTIC zone
- Publication
Journal of Geophysical Research. Biogeosciences, 2022, Vol 127, Issue 2, p1
- ISSN
2169-8953
- Publication type
Article
- DOI
10.1029/2021JG006633