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Impacts of Oceanic Fronts and Eddies in the Kuroshio-Oyashio Extension Region on the Atmospheric General Circulation and Storm Track

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Advances in Atmospheric Sciences 2022年第1期39卷 22-54页

作者： Guidi ZHOU xuhua cheng Key Laboratory of Marine Hazards Forecasting Ministry of Natural Resources(MNR)Hohai UniversityNanjing 210098China College of Oceanography Hohai UniversityNanjing 210098China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China

This paper reviews the progress in our understanding of the atmospheric response to midlatitude oceanic fronts and eddies,emphasizing the Kuroshio-Oyashio Extension(KOE)*** perturbations of interest consist of sharp oceanic fronts,temperature anomalies associated with mesoscale eddies,and to some extent even higher-frequency submesoscale *** focus is on the free atmosphere above the boundary *** the midlatitude atmosphere is dominated by vigorous transient eddy activity in the storm track,the response of both the time-mean flow and the storm track is *** storm track response arguably overwhelms the mean-flow response and makes the latter hard to detect from *** frontal impacts on the mesoscale structures of individual synoptic storms are discussed,followed by the role of oceanic fronts in maintaining the storm track as a *** fronts exhibit significant decadal variability and can therefore presumably modulate the storm *** studies are summarized and *** understanding has advanced greatly but is still subject to large uncertainties arising from inadequate data resolution and other *** modeling studies highlighted the importance of mesoscale eddies and probably even submesoscale processes in maintaining the storm track but confirmation and validation are still ***,the atmospheric response can potentially provide a feedback mechanism for the North Pacific *** reviewing the above aspects,we envision that future research shall focus more upon the interaction between smaller-scale oceanic processes(fronts,eddies,submesoscale features)and atmospheric processes(fronts,extratropical cyclones etc.),in an integrated way,within the context of different climate background states.

关键词： atmospheric response storm track oceanic front mesoscale eddy submesoscale Kuroshio-Oyashio Extension

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Eddy generation mechanism in the eastern South China Sea

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Acta Oceanologica Sinica 2019年第4期38卷 20-28页

作者： Jiajia Chen xuhua cheng Xiao Chen College of Oceanography Hohai University Key Laboratory of Coastal Disaster and Defence (Hohai University) Ministry of Education

Mesoscale eddy generation mechanisms in the eastern South China Sea(ESCS) are investigated using altimetry observations and solutions of a nonlinear, 1?-layer reduced-gravity model. We estimate the relative roles of the wind forcing in the interior South China Sea(SCS) and the remote forcing from the western tropical Pacific(WTP)in eddy generation in the ESCS. Model solutions show that the high-frequency wind in the interior SCS is the primary forcing for eddies, which explains about 54% of the mesoscale eddies generated in the ESCS. Signals from the WTP also play an important role. Wind-driven equatorial signals reach the west coast of Luzon Island through the Sibutu Passage and Mindoro Strait. The reflected Rossby waves from the west coast of Luzon Island propagate westward, become unstable, and turn into eddies. The signals driven by high-frequency wind from the WTP explain about 40% of the mesoscale eddies generated in the ESCS. The high-frequency wind forcing in both the SCS and the WTP is important for eddy generation in the ESCS.

关键词： mesoscale eddy South China Sea wind forcing Rossby wave

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Interannual variability in the barrier layer and forcing mechanism in the eastern equatorial Indian Ocean and Bay of Bengal

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Acta Oceanologica Sinica 2020年第7期39卷 19-31页

作者： Tian Ma xuhua cheng Yiquan Qi Jiajia Chen Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210098China College of Oceanography Hohai UniversityNanjing 210098China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China

Interannual variability(IAV)in the barrier layer thickness(BLT)and forcing mechanisms in the eastern equatorial Indian Ocean(EEIO)and Bay of Bengal(BoB)are examined using monthly Argo data sets during 2002–*** BLT during November–January(NDJ)in the EEIO shows strong IAV,which is associated with the Indian Ocean dipole mode(IOD),with the IOD leading the BLT by two *** the negative IOD phase,the westerly wind anomalies driving the downwelling Kelvin waves increase the isothermal layer depth(ILD).Moreover,the variability in the mixed layer depth(MLD)is *** by the Wyrtki jet,the MLD presents negative anomalies west of 85°E and strong positive anomalies between 85°E and 93°***,the BLT shows positive anomalies except between 86°E and 92°E in the ***,the IAV in the BLT during December–February(DJF)in the BoB is also *** the eastern and northeastern BoB,the IAV in the BLT is remotely forced by equatorial zonal wind stress anomalies associated with the El Ni?o-Southern Oscillation(ENSO).In the western BoB,the regional surface wind forcing-related ENSO modulates the BLT variations.

关键词： barrier layer thickness interannual variability eastern equatorial Indian Ocean Bay of Bengal

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Variability in upper-ocean salinity stratification in the tropical Pacific Ocean

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Acta Oceanologica Sinica 2021年第1期40卷 113-125页

作者： Wei Duan xuhua cheng Xiuhua Zhu Tian Ma College of Oceanography Hohai UniversityNanjing 210098China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China Center for Earth System and Sustainability University of HamburgHamburg 20144Germany

Using a gridded array for real-time geostrophic oceanography(Argo)program float dataset,the features of upperocean salinity stratification in the tropical Pacific Ocean are *** salinity component of the squared Brunt-V?is?l?frequency N2(NS2)is used to represent salinity ***-max NS2(LMN),defined as the NS2 maximum over the upper 300 m depth,and halocline depth(HD),defined as the depth where the NS2 maximum is located,are used to specifically describe the intensity of salinity *** stratification in the Topical Pacific Ocean has both spatial and temporal *** the western and eastern equatorial Pacific,the LMN has a large magnitude with a shallow HD,and both have completely opposite distributions outside of the equatorial *** obvious seasonal cycle in the LMN occurs in the north side of eastern equatorial Pacific and freshwater flux forcing dominates the seasonal variations,followed by subsurface *** the eastern edge of the western Pacific warm pool around the dateline,significant interannual variation of salinity stratification occurs and is closely related to the El Ni?o Southern Oscillation *** an El Ni?o event occurs,the precipitation anomaly freshens sea surface and the thermocline shoaling induced by the westerly wind anomaly lifts salty water upward,together contribute to the positive salinity stratification anomaly over the eastern edge of the warm *** interannual variations in ocean stratification can slightly affect the propagation of first baroclinic gravity waves.

关键词： Brunt-Vaisala frequency salinity stratification seasonal and interannual variations gravity wave

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Submesoscale motions and their seasonality in the northern Bay of Bengal

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Acta Oceanologica Sinica 2022年第4期41卷 1-13页

作者： Lanman Li xuhua cheng Zhiyou Jing Haijin Cao Tao Feng College of Oceanography Hohai UniversityNanjing 210098China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

The unbalanced submesoscale motions and their seasonality in the northern Bay of Bengal(BoB)are investigated using outputs of the high resolution regional oceanic modeling *** motions in the forms of filaments and eddies are present in the upper mixed layer during the whole annual *** motions show an obvious seasonality,in which they are active during the winter and spring but weak during the summer and *** seasonality is associated with the mixed layer instability that depends on the mixed layer depth(MLD).During the winter,the MLD provides a much greater reservoir of the available potential energy,which promotes mixed layer instability to develop active submesoscale *** variations of MLD are likely modulated by the larger scale motions and the influxes of *** investigations imply that the MLD and the stratified barrier layer are combined to determine the vertical structure of the submesoscale *** shallow MLD and strong stratification below during the summer and fall seem to prevent the downward extension of submesoscale *** in spring when the weak stratification exists,the penetration depth exceeds the base of the barrier layer.

关键词： submesoscale motions seasonality northern BoB mixed layer instability stratification

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Recent Changes of Northern Indian Ocean Summer Rainfall Based on CMIP5 Multi-Model

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Journal of Ocean University of China 2013年第2期12卷 201-208页

作者： YANG Yali DU Yan ZHANG Yuhong cheng xuhua State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyCAS University of Chinese Academy of Sciences UCAS

This study evaluates the simulation of summer rainfall changes in the Northern Indian Ocean (NIO) based on the fifth phase of Coupled Model Intercomparison Project (CMIP5). The historical runs of 20 CMIP5 coupled General Circulation Models (GCMs) are analyzed. The Multi-Model ensemble (MME) of the CMIP5 models well reproduces the general feature of NIO summer rainfall. For a short period 1979?2005, 14 out of 20 models show an increased trend in the mean rainfall and a similar spatial distri-bution to the Global Precipitation Climatology Project (GPCP) observations in MME. The increasing of the convergence in the equatorial IO results in the increase of rainfall significantly. The equatorial rainfall trend patterns seem modulated by the SST warm-ing in the tropical Indian Ocean, which confirm the mechanism of 'warmer-get-wetter' theory. For a long period 1950?2005, the trend of monsoon rainfall over India shows a decrease over the most parts of the India except an increase over the south corn er of the Indian Peninsula, due to a weakened summer monsoon circulation. The pattern is well simulated in half of the CMIP5 models. The rainfall over the north India is different for a short period, in which rainfall increases in 1979?2005, implying possible decadal varia-tion in the NIO summer climate.

关键词： NIO summer rainfall Indian summer monsoon inter-decadal changes

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Study on the interannual variability of the Kerama Gap transport and its relation to the Kuroshio/Ryukyu Current system

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Acta Oceanologica Sinica 2024年第3期43卷 1-14页

作者： Han Zhou Kai Yu Jianhuang Qin xuhua cheng Meixiang Chen Changming Dong Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210003China College of Oceanography Hohai UniversityNanjing 210003China School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 211800China

An analysis of a 68-year monthly hindcast output from an eddy-resolving ocean general circulation model reveals the relationship between the interannual variability of the Kerama Gap transport(KGT)and the Kuroshio/Ryukyu Current *** study found a significant difference in the interannual variability of the upstream and downstream transports of the East China Sea-(ECS-)Kuroshio and the Ryukyu *** interannual variability of the KGT was found to be of paramount importance in causing the differences between the upstream and downstream ***,it contributed approximately 37%to the variability of the Ryukyu *** interannual variability of the KGT was well described by a two-layer rotating hydraulic *** was dominated by its subsurface-intensified flow core,and the upper layer transport made a weaker negative contribution to the total *** subsurface flow core was found to be mainly driven by the subsurface pressure head across the Kerama Gap,and the pressure head was further dominated by the subsurface density anomalies on the Pacific *** density anomalies could be traced back to the eastern open ocean,and their propagation speed was estimated to be about 7.4 km/d,which is consistent with the speed of the local first-order baroclinic Rossby *** the negative(positive)density anomaly signal reached the southern region of the Kerama Gap,it triggered the increase(decrease)of the KGT towards the Pacific side and the formation of an anticyclonic(cyclonic)vortex by baroclinic ***,there is an increase(decrease)in the upstream transport of the entire Kuroshio/Ryukyu Current system and an offshore flow that decreases(increases)the downstream Ryukyu Current.

关键词： Kerama Gap Kuroshio Ryukyu Current OGCM for the Earth Simulator(OFES) hydraulic theory

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Interannual variability of the spring Wyrtki Jet

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Journal of Oceanology and Limnology 2021年第1期39卷 26-44页

作者： Kangping DENG xuhua cheng Tao FENG Tian MA Wei DUAN Jiajia CHEN Hohai University Nanjing 210098China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China Key Laboratory of Coastal Disaster and Defense(Hohai University) Ministry of EducationNanjing 210098China

Features of the interannual variability of the spring Wyrtki Jet in the tropical Indian Ocean are revealed using observation data and model *** results show that the jet has signifi cant interannual variation,which has a signifi cant correlation with winter El Niño Modoki index(R=0.62).During spring after an El Niño(La Niña)Modoki event,the Wyrtki Jet has a positive(negative)anomaly,forced by a westerly(easterly)wind *** result of a linear-continuously stratifi ed model shows that the fi rst two baroclinic modes explain most of the interannual variability of the spring Wyrtki Jet(~70%)and the third to fi fth modes together account for approximately 30%.Surface wind anomalies in the tropical Indian Ocean are related to the Walker circulation anomaly associated with El Niño/La Niña *** interannual variability of the spring Wyrtki Jet has an evident impact on sea surface salinity transport before the onset phase of the summer monsoon in the Indian Ocean.

关键词： Equatorial Indian Ocean Wyrtki Jet interannual variability El Niño/La Niña Modoki

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Dynamics of seasonal and interannual variability of the ocean bottom pressure in the Southern Ocean

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Acta Oceanologica Sinica 2022年第5期41卷 78-89页

作者： Xiaoqin Xiong xuhua cheng Niansen Ou Tao Feng Jianhuang Qin Xiao Chen Rui Xin Huang College of Oceanography Hohai UniversityNanjing210024China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519080China College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang524088China Woods Hole Oceanographic Institution FalmouthWoods HoleMA02543USA

Seasonal and interannual variability of ocean bottom pressure(OBP)in the Southern Ocean was investigated using Gravity Recovery and Climate Experiment(GRACE)data and a Pressure Coordinate Ocean Model(PCOM)based on mass *** comparing OBP,steric sea level,and sea level,it is found that at high latitudes the OBP variability dominates the sea level variability at seasonal-to-decadal time *** diagnostic OBP based on barotropic vorticity equation has a good correlation with the observations,indicating that wind forcing plays an important role in the variability of the OBP in the Southern *** unique interannual patterns of OBP in the Southern Ocean are closely associated with El Niño-Southern Oscillation(ENSO)and Southern Annular Mode(SAM).Regression analysis indicates that ENSO and SAM influence the OBP through altering the Ekman transport driven by surface *** leading pattern of OBP from PCOM are very similar to *** experiments of PCOM show that surface wind forcing explains the observed OBP variability quite well,confirming the importance of wind forcing and related oceanic *** the eastern South Pacific,the averaged OBP shows a decrease(increase)trend before(after)2011,reflecting the reverse trend in westerly *** the South Indo-Atlantic Ocean,the averaged OBP has a weak increase trend during 2003–2016.

关键词： ocean bottom pressure Southern Ocean interannual variability PCOM

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电液伺服系统多模型鲁棒自适应控制

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西安交通大学学报 2018年第11期52卷 156-162页

作者：成旭华姚建勇乐贵高南京理工大学机械工程学院南京290014

针对电液伺服系统中存在不确定非线性和强参数不确定性的问题,提出一种多模型鲁棒自适应控制算法。根据系统参数不确定性范围建立了多个辨识模型,在辨识模型中设计非线性鲁棒项,以抑制干扰、未建模动态等不确定非线性的影响,提高系统的... 详细信息

针对电液伺服系统中存在不确定非线性和强参数不确定性的问题,提出一种多模型鲁棒自适应控制算法。根据系统参数不确定性范围建立了多个辨识模型,在辨识模型中设计非线性鲁棒项,以抑制干扰、未建模动态等不确定非线性的影响,提高系统的鲁棒性。基于辨识模型设计相应的控制器,采用基于辨识误差的性能指标函数作为切换依据,选取最佳控制器作为当前控制器,解决了传统自适应控制对参数自适应初值敏感的问题。该方法能够克服不确定非线性和强参数不确定性的影响,使系统得到渐进跟踪的性能,提高系统的瞬态响应性能。实验结果表明,该算法能抑制建模不确定性的影响,系统期望跟踪指令幅值为10mm时,跟踪误差大约为0.038 6mm,相对跟踪误差约为0.386%,系统跟踪精度得到了提高。

关键词：电液伺服系统多模型自适应辨识模型鲁棒性

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