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Assimilated Tidal Results of Tide Gauge and TOPEX/POSEIDON Data over the china seas Using a Variational Adjoint Approach with a Nonlinear Numerical Model

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Advances in Atmospheric Sciences 2006年第3期23卷 449-460页

作者：韩桂军李威何忠杰刘克修马继瑞 National Marine Data and Information Service

In order to obtain an accurate tide description in the china seas, the 2-dimensional nonlinear numerical Princeton Ocean Model （POM） is employed to incorporate in situ tidal measurements both from tide gauges and TOPEX/POSEIDON （T/P） derived datasets by means of the variational adjoint approach in such a way that unknown internal model parameters, bottom topography, friction coefficients and open boundary conditions, for example, are adjusted during the process. The numerical model is used as a forward model. After the along-track T/P data are processed, two classical methods, i.e. harmonic and response analysis, are implemented to estimate the tide from such datasets with a domain covering the model area extending from 0° to 41°N in latitude and from 99°E to 142°E in longitude. And the results of these two methods are compared and interpreted. The numerical simulation is performed for 16 major constituents. In the data assimilation experiments, three types of unknown parameters （water depth, bottom friction and tidal open boundary conditions in the model equations） are chosen as control variables. Among the various types of data assimilation experiments, the calibration of water depth brings the most promising results. By comparing the results with selected tide gauge data, the average absolute errors are decreased from 7.9 cm to 6.8 cm for amplitude and from 13.0° to 9.0° for phase with respect to the semidiurnal tide M2 constituent, which is the largest tidal constituent in the model area. After the data assimilation experiment is performed, the comparison between model results and tide gauge observation for water levels shows that the RMS errors decrease by 9 cm for a total of 14 stations, mostly selected along the coast of china's Mainland, when a one-month period is considered, and the correlation coefficients improve for most tidal stations among these stations.

关键词： tides variational adjoint approach tidal gauges TOPEX/POSEIDON the china seas

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A novel high resolution model without open boundary conditions applied to the china seas: first investigation on tides

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Acta Oceanologica Sinica 2010年第6期29卷 12-25页

作者： YU Huaming CHEN Xueen BAO Xianwen Thomas Pohlmann WU Dexing Institute of Physical Oceanography Ocean University of China Qingdao 266100 China Institute of Oceanography Centre for Marine and Climate Research University of Hamburg Hamburg 20146 Germany

We developed a Global Ocean Circulation and Tide Model （GOCTM） with coarse grids in the open deep ocean degrading ‘smoothly’ into the highly resolved china seas （CS） of refined grids to study the tides and circulation *** is based on the framework of the Finite Volume approach for better mass conservation through improved transports across the discrete individual control *** also takes a full advantage of the geometric flexibility of unstructured mesh using a realistic global topography including the Arctic *** CS are given a special focus by refining the unstructured grids,but they are embedded into global domain ***,GOCTM not only successfully avoids the treatment of the open boundaries,but also optimizes the trade-off between computational cost and model ***,GOCTM is driven by the astronomical tide-generating potential and the secondary tide-generating potential directly,together with the wind stress and heat *** succeeds in reproducing the global eight principal tidal harmonic ***,the simulated tidal results in the CS are improved compared to some other regional models with the discrepancy of 3.9 cm for M 2 *** idea of GOCTM can also be referred for other regional ocean study.

关键词： finite volume model GOCTM open boundary conditions the china seas

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维普期刊数据库

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Climatology of Wind-seas and Swells in the china seas from Wave Hindcast

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Journal of Ocean University of china 2020年第1期19卷 90-100页

作者： QIAN Chengcheng JIANG Haoyu WANG Xuan CHEN Ge North china Sea Marine Forecasting Center of State Oceanic Administration Qingdao 266100China Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and TechnologyQingdao 266000China College of Information Science and Engineering Ocean University of ChinaQingdao 266100China College of Marine Science and Technology China University of GeosciencesWuhan 430000China College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 200000China

The wind-sea and swell climates in the china seas are investigated by using the 27-yr Integrated Ocean Waves for Geophysical and other Applications(IOWAGA)hindcast data.A comparison is made between the significant wave height from the IOWAGA hindcasts and that from a jointly calibrated altimetry dataset,showing the good performance of the IOWAGA hindcasts in the china seas.A simple but practical method of diagnosing whether the sea state is wind-sea-dominant or swell-dominant is proposed based on spectral *** from the characteristics of wind-seas and swells in the open ocean,the wave fields in the enclosed seas such as the china seas are predominated by wind-sea events in respect of both frequencies of occurrences and energy weights,due to the island sheltering and limited *** energy weights of wind-seas in a given location is usually more significant than the occurrence probability of wind-sea-dominated events,as the wave energy is higher in the wind-sea events than in the swell events on average and extreme wave heights are mostly related to *** most energetic swells in the china seas(and other enclosed seas)are‘local swells’,having just propagated out of their generation ***,the swells coming from the West Pacific also play an important role in the wave climate of the china seas,which can only be revealed by partitioning different swell systems in the wave spectra as the energy of them is significantly less than the‘local swells’.

关键词： the china seas wind-sea swell wave climate WAVEWATCH Ⅲ

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维普期刊数据库

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TIDAL FEATURES IN the china seas AND THEIR ADJACENT SEA AREAS AS DERIVED FROM TOPEX/POSEIDON ALTIMETER DATA

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Chinese Journal of Oceanology and Limnology 2001年第4期19卷 293-305页

作者：胡建宇 Hiroshi KAWAMURA 洪华生 Fumiaki KOBASⅢ 谢强 Marine Environmental Laboratory of the Ministry of Education College of Oceanography and Environmental ScienceXiamen University CenterforAtmospheric and Oceanic Studies Faculty of Science Tohoku University Sendai South china Sea Institute of Oceanology Chinese Academy of Sciences

Some important tidal features of 8 major tidal constituents ( M 2, S 2, K 1, O 1, P 1, Sa, N 2 and K 2 ) in the china seas and their adjacent sea areas were obtained using six years’ TOPEX/POSEIDON altimeter data. The results showed that the obtained co tidal and co range charts for these major tidal constituents agreed well with those of previous researches using observational data from coastal tidal gauge stations and numerical models.

关键词： TOPEX/POSEIDON altimeter data tidal features the china seas tidal features

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维普期刊数据库

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MEAN SEA LEVEL AND SEA SURFACE VARIABILITY OF NORTHWEST PACIFIC OCEAN AND EASTERN china seas FROM GEOSAT ALTIMETRY

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Chinese Journal of Oceanology and Limnology 1994年第2期12卷 154-164,191页

作者：陈戈贺明霞 Ocean Remote Sensing Institute Ocean University of Qingdao Qingdao School of Marine Science & Technology Tokai University Shimizu Japan

Collinear analysis technique is widely used for determining sea surface variability with Geosat altimeter data from its Exact Repeat Mission (ERM). But most of the researches have been only on global scale or in oceans deeper than 2000 m In shallow shelf waters this method is hampered by the inaccuracy of ocean tide data supplied with Geosat Geophysical Data Records (GDRs). This work uses a modified collinear analysis technique characterized by simultaneous separation of mean sea level and ocean tide with the least squares method, to compute sea surface variability in the Northwest Pacific Ocean and eastern china seas. The mean sea level map obtained contains not only bathymetric but also dynamic features such as amphidromes, indicating considerable improvement over previous works. Our sea surface variability maps show dearly the main current system, the well-known Zhejiang coastal upwelling, and a northern East china Sea meso-scale eddy in good agreement with satellite sea surface temperature (SST) bservation and historical in situ measurement. These all suggest that meaningful and reliable oceanographic results can still be achieved in shallow shelf waters from Geosat altimetry as long as proper data processing techniques are applied.

关键词： mean sea level sea surface variability Geosat altimetry the china seas

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维普期刊数据库

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