What is it about?
The nutrient element ratio and eutrophication status of the Bohai Sea were characterized and explained using newly obtained data.
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Why is it important?
According to our nutrient budgets, atmospheric nitrogen deposition served as a significant DIN source, accounting for 28% of DIN inputs to the central Bohai Sea. Benthic N loss at the water–sediment interface nearly balanced the N supply from atmospheric deposition. North Yellow Sea water intrusion supplied 55% of DIN and 99% of DIP to the central Bohai Sea. The increasing DIN input from the Yellow Sea and atmospheric deposition dominated the enhanced eutrophication in the central Bohai Sea during recent several decades, while nutrient deliveries through diluted waters (including SGDs) contributes at interannual variable scales.
Perspectives
To manage eutrophication and environmental degradation in the Bohai Sea, the coupled Bohai and Yellow Seas should be regarded as an integrated marine system. Besides those sewage and pollution controls in surrounding provinces and cities, large-scale environmental factors such as the Asian dust (supporting the atmospheric nitrogen deposition) changes should also be seriously considered.
Dr Wei-Dong Zhai
Shandong University
Read the Original
This page is a summary of: Improving the understanding of central Bohai Sea eutrophication based on wintertime dissolved inorganic nutrient budgets: Roles of north Yellow Sea water intrusion and atmospheric nitrogen deposition, Environmental Pollution, December 2020, Elsevier,
DOI: 10.1016/j.envpol.2020.115626.
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