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Ocean eddies, fronts, and air-sea exchanges: Observations and high resolution simulations
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TOOSSE: the high resolution Two Oceans One Sea State Estimate
Wednesday 9th @ 1450-1510, Conference Room 4
Chuanyu Liu* , Institute of Oceanology, Chinese Academy of Sciences
Xiaowei Wang, Institute of Oceanology, Chinese Academy of Sciences
Fan Wang, Institute of Oceanology, Chinese Academy of Sciences
Armin Koehl, Institute of Oceanography, University of Hamburg
Presenter Email: chuanyu.liu@qdio.ac.cn |
| An eddy resolving general circulation model (MITgcm) of the low-latitude Pacific Ocean, Indian Ocean and South China Sea (hereafter Two Oceans One Sea: TOOS) is fit by constrained least squares to a large modern observational datasets during 2015–16. Data used include Argo float profiles, CTD data from Chinese observational system in the western Pacific and South China Sea, altimetric observations, and satellite sea surface temperature. A 4D-var (adjoint) model is used to determine descent directions in minimizing a cost function. The model is brought into near agreement with the data by adjusting its control vector, which consists of initial conditions, sea surface boundary conditions (air-sea fluxes), and background vertical mixing parameters. Preliminary results show that the adjusted ocean state of TOOS captures the multiple oceanic variabilities in this region, while the adjusted control variables provide optimal air-sea and oceanic fluxes that maintain the varying ocean state. Theories involving warm pool-cold tongue dynamics, ENSO dynamics, air-sea interaction over mesoscale eddies, intra-seasonal variability dynamics, the Indonesia Through Flow, and interaction between multi-scale processes may then be tested and explored with this dynamically and thermodynamically consistent model solution. |
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