Influence of oceanic nutrient input on nutrient of Yellow Sea

CHEN Chuangye; ZHAO Liang; ZHANG Jing

doi:10.13984/j.cnki.cn37-1141.2025.02.013

Abstract：As the Yellow Sea is a semi-enclosed shallow shelf sea,oceanic input is an important source of diverse nutrients.Understanding the influence of oceanic nutrients on the changes of nutrient con-centration and content in the Yellow Sea is beneficial to strengthen the conservation of fishery resources and enhance ecological management.Based on the coupled physical-biogeochemical model,in this stud-y,we analyzed the influence of oceanic nutrient input on the nutrients of the Yellow Sea.When the o-ceanic nutrient input increases,the surface layer of the Yellow Sea,south of 35°N,increases signifi-cantly in autumn and winter,and the bottom layer increases mainly in the shallows of northern Jiangsu Province and the Yellow Sea trough in winter,and in the middle of the south Yellow Sea in spring,summer and autumn.The input from the Qidongzui-Jeju Island section added the largest amount of nu-trients present in the Yellow Sea,and increased significantly in the middle and lower layers throughout the year while the exchange loss of nutrients present in the Jeju Strait section is the largest with a more uniform distribution of loss in winter and spring,and significant loss in the middle of the strait in sum-mer and autumn.The nutrient present in the water column showed an increase throughout the year with the most significant increase in the inorganic nutrient present,and the average increase in the year accounts for more than 60％of the total increase in the water column.The organic state nutrients pres-ent in the water column was consistent with the inter-month variation rate of the phytoplankton pres-ent,and was higher in summer and autumn than in winter and spring.