Numerical investigation of nutrient limitations in the Bohai Sea

Marine Environmental Research
Hao Liu, Baoshu Yin

Abstract

River discharges are the important freshwater and nutrient sources for Bohai Sea (BS), and have a profound impact on the local marine environment. In this paper, the annual cycles of nutrient and phytoplankton dynamics in 1980s were reproduced using a coupled biogeochemical-physical model. Based on the validated simulations, the nutrient limitation characters were further investigated by running the model with the riverine nutrient altered, first enriching nitrogen and then phosphorus. It was found that although the riverine N:P ratios in Yellow and Haihe Rivers were much higher than the Redfield number, the nitrogen enrichment was still able to enhance the algae bloom in Laizhou and Bohai Bays. On the other hand, the response of algae growth to phosphorus enrichment was not thus obvious, which suggests that the local phytoplankton dynamics was characterized by the nitrogen limitation. Simulations also show that the nitrogen enrichment is generally accompanied by the phosphorus consumption, so a shift from nitrogen limitation to phosphorus limitation may occur if such a trend continues.

References

Jul 11, 1998·Science·P G FalkowskiV Smetacek

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Citations

Jul 24, 2012·Environmental Science and Pollution Research International·Hao Chen, Binghui Zheng
Jun 15, 2017·Environmental Monitoring and Assessment·Xiangjun DuSi Xu
Aug 10, 2021·The Science of the Total Environment·Xiaokun DingZhaosen Wu

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