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Improvements to the statistical theoretical model for wave breaking based on the ratio of breaking wave kinetic and potential energy

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Science China Earth Sciences 2017年第1期60卷 180-187页

作者： WANG HaiLi yang yongzeng SUN BaoNan SHI YongFang Key Laboratory of Marine Science and Numerical Modeling The First Institute of OceanographyState Oceanic Administration Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology

An improvement was proposed for the statistical theory of breaking erttrainment depth and surface whitecap coverage of real sea waves in this study. The ratio of the kinetic and potential energy was estimated on a theoretical level, and optimal constants were determined to improve the statistical theory model for wave breaking. We also performed a sensitivity test to the model constants. A comparison between the model and in situ observations indicated that the level of agreement was better than has been achieved in previous studies.

关键词： Wave breaking Statistical theoretical model Ratio of breaking wave kinetic and potential energy Whitecapcoverage Entrainment depth

Preliminary Results of Assessing the Mixing of Wave Transport Flux Residualin the Upper Ocean with ROMS

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Journal of Ocean University of China 2016年第2期15卷 193-200页

作者： SHI Yongfang WU Kejian yang yongzeng Department of Oceanography Ocean University of ChinaQingdao 266100P.R.China Key Laboratory of Marine Science and Numerical Modeling State Oceanic AdministrationQingdao 266061P.R.China

The effects of the mixing of wave transport flux residual(Bvl) on the upper ocean is studied through carrying out the control run(CR) and a series of sensitive runs(SR) with ROMS *** this study,the important role of Bvl is revealed by comparing the ocean temperature,statistical analysis of errors and evaluating the mixed layer *** is shown that the overestimated SST is improved effectively when the wave-induced mixing is incorporated to the vertical mixing *** can be seen from the vertical structure of temperature 28℃ isotherm changes from 20 min CR to 35 m in SR3,which is more close to the *** analysis shows that the root-mean-square errors of the temperature in 10 m are reduced and the correlation between model results and observation data are increased after considering the effect of *** numerical results of the ocean temperature show improvement in summer and in tropical zones in winter,especially in the strong current regions in *** August the mixed layer depth(MLD) which is defined as the depth that the temperature has changed 0.5℃ from the reference depth of 10 m is further *** simulation results have a close relationship with undetermined coefficient of Bvl,sensitivity studies show that a coefficient about 0.1 is reasonable value in the model.

关键词： Bvl ocean temperature mixed layer depth ROMS model

The improved model of estimating global whitecap coverage based on satellite data

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Acta Oceanologica Sinica 2016年第5期35卷 66-72页

作者： REN Danqin HUA Feng yang yongzeng SUN Baonan First Institute of Oceanography State Oceanic Administration

The pro and con of whitecap parameterizations and a statistical wave breaking model are discussed. An improved model is derived by combining satellite-based parameterization and the wave breaking model. The appropriate constants for the general wave state are obtained by considering the breaking condition of the wave slope and fitting with the satellite-based parameterization. The result is close to the constants based on the whitecap data from Monahan. Comparing with satellite-based data and the original model＇s results, the improved model＇s results are consistent with satellite-based data and previous studies. The global seasonal distributions of the whitecap coverage averaged from 1998 to 2008 are presented. Spatial and seasonal features of the whitecap coverage are analyzed.

关键词： whitecap coverage statistical wave breaking model satellite-based parameterization

The role of surface waves in the ocean mixed layer

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Acta Oceanologica Sinica 2008年第3期27卷 30-37页

作者： QIAO Fangli yang yongzeng XIA Changshui YUAN Yeli First Institute of Oceanography State Oceanic Administration Qingdao 266061 China

Previously, most ocean circulation models have overlooked the role of the surface waves. As a result, these models have produced insufficient vertical mixing, with an under - prediction of the ,nixing layer （ML） depth and an over - prediction of the sea surface temperature （SST）, particularly during the summer season. As the ocean surface layer determines the lower boundary conditions of the atmosphere, this deficiency has severely limited the performance of the coupled ocean - atmospheric models and hence the climate studies. To overcome this shortcoming, a new parameterization for the wave effects in the ML model that will correct this systematic error of insufficient mixing. The new scheme has enabled the mixing layer to deepen, the surface excessive heating to be corrected, and an excellent agreement with observed global climatologic data. The study indicates that the surface waves are essential for ML formation, and that they are the primer drivers of the upper ocean dynamics; therefore, they are critical for climate studies.

关键词： wave - induced mixing ocean circulation model mixing layer

Estimating the evolution of sea state non-Gaussianity based on a phase-resolving model

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Journal of Oceanology and Limnology 2022年第5期40卷 1909-1923页

作者： Xingjie JIANG Tingting ZHANG Dalu GAO Daolong WANG yongzeng yang First Institute of Oceanography and Key Laboratory of Marine Science and Numerical ModelingMinistry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Shandong Key Laboratory of Marine Science and Numerical Modeling Qingdao 266061China Ocean University of China College of Oceanic and Atmospheric SciencesQingdao 266071China

The occurrence of rogue waves is closely related to the non-Gaussianity of sea states,and this non-Gaussianity can be estimated using corresponding two-dimensional wave *** paper presents an approach to non-Gaussianity estimation based on a phase-resolving model called the high-order spectral method(HOSM).Based on numerous HOSM simulations,a set of precalculated non-Gaussianity indicators was established that could be applied to real sea states without any calibration of spectral *** a newly developed extraction approach,the indicators for given two-dimensional wave spectra could then be conveniently extracted from the precalculated *** feasibility of the newly developed approach in a real wave environment is *** the estimation approach,phase-resolved non-Gaussianity can now be illustrated throughout the evolution of sea states of interest,not just at a few specific times;and the level of non-Gaussianity at any time in a duration can be identified according to the statistics(e.g.,quantities)of the phase-resolved indicators,that are obtained throughout the duration concerned.

关键词： rogue wave sea state non-Gaussianity high-order spectral method spectral geometry wave-wave nonlinearity

Study on surface wave-induced mixing of transport flux residue under typhoon conditions

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Journal of Oceanology and Limnology 2019年第6期37卷 1837-1845页

作者： yang yongzeng SHI Yongfang YU Chencheng TENG Yong SUN Meng First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China Key Laboratory of Marine Science and Numerical Modeling Ministry of Natural ResourcesQingdao 266061China Zhejiang University Zhoushan 316021China

The transport flux residue of surface waves plays an important role in a variety of ocean phenomena,for example,the change in sea surface temperature(SST)and upper mixed layer profile that were studied in a series of recent *** the previous studies,its effect was discussed rigorously and fragmented based on numerical *** we propose a relatively comprehensive and simplified exposition of the wave transport flux residue,and focus on its influence under typhoon conditions with strong background *** analogue Reynolds Number is presented for tentative comparison with wave-generated turbulence mixing,especially in the coastal *** results indicate that both overwhelming dynamical mixing processes can remarkably change the coastal environment,and should not be ignored consciously for further marine hazards assessment.

关键词： wave transport flux residue decomposition scheme Analogue Reynolds Number

Mechanism of sea ice formation based on comprehensive observation data in Liaodong Bay, China

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Journal of Oceanology and Limnology 2019年第6期37卷 1846-1856页

作者： SHI Yongfang yang yongzeng TENG Yong SUN Meng YUN Shengjun First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling National Laboratory for Marine Science and TechnologyQingdao 266071China Key Laboratory of Marine Science and Numerical Modeling Ministry of Natural ResourcesQingdao 266061China

Sea ice disaster is one of the principal natural hazards that affect some coastal areas of China,and the formation of ice cover in a wave field has important ***,analysis of the mechanism in which waves affect the thermodynamic process of sea ice is lacking,and the influence of waves is not taken into consideration in numerical models of sea ice,largely because of a lack of simultaneous observations of waves and sea *** observational data of the sea ice cycle in the coastal waters of Liaodong Bay(China),we analyzed the characteristics of hydrology,meteorology,and sea ice thickness during the formation of sea ice,and explored the changes in the interrelationships among heat fluxes,waves,and sea ice under actual sea *** results could provide a decision-making support as a reference to the establishment and improvement of China's early waming system to sea ice disasters,and the protection of ice drilling operations and production platform safety.

关键词： wave sea ice wave-induced turbulence kinetic energy

An improvement of the too cold tongue in the tropical Pacific with the development of an ocean-wave-atmosphere coupled numerical model

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Progress in Natural Science:Materials International 2007年第5期17卷 576-583页

作者： Song Zhenya, Qiao Fangli, yang yongzeng and Yuan Yeli (The First Institute of Oceanography, SOA, Qingdao 266061, China) [a]The First Institute of Oceanography SOA Qingdao China

A common problem in the application of the coupled ocean-atmosphere general circulation models (CGCMs) without flux correction is that the simulated equatorial cold tongue in general tends to be too strong, narrow, and extending too far west. The causes are not well understood yet. One possible reason may be the simulated mixed layer depth (MLD) is too shallow in the tropical Pacific due to insufficient vertical mixing in the OGCM. It is believed that the wave-induced vertical mixing can greatly improve the simulation of the MLD and thermocline structure. In this study, the coupled ocean-atmosphere general circulation model (FGCM-0) incorporated with wave-induced mixing has been employed to simulate the tropical Pacific sea surface temperature (SST). Generally, the wave-induced mixing lowers the SST in the OGCM because the strengthened vertical mixing can bring more cold water upward. However, in the coupled model, the non-uniformity of the space distribution in SST drop generates a horizontal gradient of the sea surface air pressure, and thus yields surface wind field anomaly. The wind anomaly leads to both ocean surface circulation anomaly and downwelling anomaly, which can restrain the overly-westward extension of the cold tongue in the tropical Pacific. Compared with the model results from the original model (FGCM-0), the modeled SST is higher by more than 0.8℃, with a maximum of 1.2℃in the western Pacific (160—180°E, 0—3°N) . The eastern boundary of the isotherm of 26. 0℃also moves from 165°E to 180°E. The overly westward extension of the simulated equatorial cold tongue is suppressed with the incorporation of the wave-induced mixing in the coupled model. The simulated SST shows in general improved results with a maximum improvement of more than 1.0℃. The simulated SST improvement in the north tropical Pacific is much better than that of the south tropical Pacific.

关键词： cold tongue wave-induced mixing the conpled ocean-atmosphere general circulation models the tropical Pacific

Analysis of the high and low temperature centers and their relation with circulations in the East China Sea

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Acta Oceanologica Sinica 2009年第2期28卷 14-22页

作者： yang yongzeng QIAO Fangli XIA Changshui GE Renfeng First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Key Laboratory of Marine Science and Numerical Modeling SOA Qingdao 266061 China

Three warm currents, the Kuroshio, its shelf intrusion branch in the northeast of Taiwan and the Taiwan Warm Current （hereafter TWC）, dominate the circulation pattern in the East China Sea （hereafter ECS）. Their origination, routes and variation in winter and summer are studied. Their relationship with four major high and low temperature centers is analyzed. Differing from the previous opinion, we suggest that the four major centers are generated to a great extent by the interaction of the currents in the ECS. In summer, a cold water belt in the northeast of Taiwan is preserved from winter between the Kuroshio and the TWC. The shelf intrusion branch of the Kuroshio separates the water belt, and two low temperature centers generate in the northeast of Taiwan. In the southern ECS, the TWC transports more heat flux northward to form a warm pool. But it is separated in the lower layer by the cold water driven by the intrusion branch of the Kuroshio. So the TWC and the intrusion branch of the Kuroshio play a dominating role to generate the high temperature center. The interaction among the eastward TWC, the northward Tsushima Warm Current （hereafter TSWC） and the southward Su Bei Coastal Flow （hereafter SBCF） generates the low temperature center in the northern ECS. In winter, the strengthening of the shelf intrusion branch of the Kuroshio obscures the two low temperature centers in the northeast of Taiwan. For the weakening of the TWC, the high temperature center in the southern ECS vanishes, and the low temperature center in the northern ECS shifts to south.

关键词： East China Sea circulation Kuroshio Taiwan Warm Current temperature