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Pushing the frontiers of marine ecological modeling: where are we now and how can we move forward?
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Modeling the Dissolved Oxygen in the Northern South China Sea in the Summer Driven by the Physical and Biogeochemical Processes
P-B3-05
Qicheng Meng* , State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration
Feng Zhou, State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration
Presenter Email: q.meng@sio.org.cn |
| The dissolved oxygen (DO) is essential for the vast aquatic species, and it is therefore significant for the whole marine ecosystem. The DO is not a conservative tracer. It is not only driven by the convection and diffusion processes, but also modulated by the air-sea interaction, photosynthesis, respiration, decomposition, etc. There are inadequate process-oriented observational data of the DO in the water column especially at the shelf seas. In the first decade of the 21st century, the State Oceanic Administration together with other authorities conducted a large-scale multi-disciplinary survey in the coastal waters of China. It provides the valuable data of the seasonal DO distribution in the northern South China Sea (NoSCS). It is found that the low DO water at the bottom on the shelf forms a pincerlike encirclement from two pathways which are off the eastern coastline of the Hainan Island and off the eastern coastline of the Guangdong province, respectively. Those two pathways seem to coincide with the two upwelling systems that are mainly induced by the prevailing summer monsoon. This research aims to use the state-of-the-art coupled physical-biogeochemical model, ROMS+CoSiNE, to reproduce the dissolved oxygen in the NoSCS in the summer. The ROMS+CoSiNE model covers the whole SCS with the 1/12° resolution. The circulation model is forced by the climatological monthly-averaged wind stress, heat flux and fresh water flux. The open boundary conditions are restored to those given by the global circulation model. It considers both the tidal forcing and the riverine runoffs. The initial and boundary conditions of the biogeochemical state variables are provided by the well-validated CoSiNE-Pacific model. The circulation model is validated by the available observational data including the climatological dataset SCSPOD14 based on the WOD dataset, the ARGO profiles and the surveys by the South China Sea Institute of Oceanology, Chinese Academy of Sciences. The performance of the biogeochemical model is evaluated by the surface chlorophyll data provided by the SeaWiFS satellite. The distribution of the low DO bottom water in the NoSCS in the summer that resembles a pair of pincers can be seen from the model result and it agrees well with the observational data. With the process-oriented model, it is expected to reveal the coupled physical and biogeochemical mechanisms that govern the DO concentration in the bottom water of the NoSCS, which may facilitate the further study of the impact of the climate change on the ecosystem inhabiting there. |
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