A numerical model study on the spatial and temporal variabilit-ies of dissolved oxygen in Qinzhou Bay of the northern Beibu Gulf

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外文摘要：Oxygen facilitates the breakdown of the organic material to provide energy for life.The concentration of dissolved oxygen(DO)in the water must exceed a certain threshold to support the normal metabolism of marine organisms.Located in the northern Beibu Gulf,Qinzhou Bay receives abundant freshwater and nutrients from several rivers which significantly influence the level of the dissolved oxygen.However,the spatial-temporal variations of DO as well as the associated driving mechanisms have been rarely studied through field observations.In this study,a three-dimensional coupled physical-biogeochemical model is used to investigate the spatial and seasonal variations of the DO and the associated driving mechanisms in Qinzhou Bay.The validation against observations indicates that the model can capture the seasonal and inter-annual variability of the DO concentration with the range of 5-10 mg/L.Sensitivity experiments show that the river discharges,winds and tides play crucial roles in the seasonal variability of the DO by changing the vertical mixing and stratification of the water column and the circulation pattern.In winter,the tide and wind forces have strong effects on the DO distribution by enhancing the vertical mixing,especially near the bay mouth.In summer,the river discharges play a dominant role in the DO distribution by inhibiting the vertical water exchange and delivering more nutrients to the Bay,which increases the DO depletion and results in lower DO on the bottom of the estuary salt wedge.These findings can contribute to the preservation and management of the coastal environment in the northern Beibu Gulf.

外文关键词：

river plumedissolved oxygenstratificationphysical-biological model

作者：

Gaolei Cheng、Shiqiu Peng、Bin Yang、Dongliang Lu

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作者单位：

State Key Laboratory of Tropical Oceanography,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China

Guangxi Key Laboratory of Marine Environmental Change and Disaster in the Beibu Gulf,Beibu Gulf University,Qinzhou 535011,China

Laboratory for Regional Oceanography and Numerical Modeling,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China

基金：

Major Projects of the National Natural Science Foundation of ChinaGuangdong Key ProjectNational Key Research and Development Program of ChinaState Key Laboratory of Tropical Oceanography Independent Research FundGuangxi Key Laboratory of Marine Environmental Change and Disaster in Beibu Gulf,Beibu Gulf University

项目编号：

U20A201052019BT2H5942022YFC3105000LTOZZ21032023KF01

出版年：

2024

DOI：

10.1007/s13131-023-2243-1

海洋学报(英文版)

中国海洋学会

海洋学报(英文版)

CSTPCD

影响因子：0.323

ISSN：0253-505X

年,卷(期)：2024.43(6)