检索结果-南通市图书馆

EI NIO PHENOMENON AND EXTENDED ASSOCIATE PATTERN ANALYSIS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2004年第1期16卷 90-100页

作者： CUIMao-chang MOJun qiaoFang-li instituteofOceanology ChineseAcademyofSciences.Qingdao266071China／KeyLaboratoryofMarineScienceandNumericalmodelingTheFirstInstituteofOceanographyStateOceanicAdministrationQingdao266061China. instituteofOceanology ChineseAcademyofSciences.Qingdao266071China keylaboratoryof{2.ScienceandNumericalmodeling TheFirstInstituteofOceanographyStateOceanicAdministrationQingdao266061China

To study the causes of El Nino Phenomenon the Extended Associate PatternAnalysis (EAPA) is set up with monthly sea surface wind stress and precipitation besides Sea LevelPressure (SLP) and Sea Surface Temperature (SST) in or over the Pacific and related seas since 1979in present paper. The results show that El Nino Phenomenon means a SST redistribution, coveringalmost the whole Pacific that needs a huge amount of energy provided by air-sea interaction in themost Pacific regions; It is the wester burst and wind convergence, coming from meddle latitudesdirectly, instead of Kelvin waves that produce the strong SST warm signal in Nino regions; Twonegative SLP anomalies in middle of the North and South Pacific, most likely produced by the averageair pressure decreasing effect of explosive cyclones through precipitation, and the positive SLPanomaly o-ver the Asia-Australia land bridge, coming mainly from the south hemisphere with a littleinfluence from the Asian continent, are the three major causes for El Nino onset, they work togetherto produce anomalous wind convergence in Nino regions and wester burst in middle of the North andSouth Pacific that result in a warm tongue and cold pincers gearing together; Basically, during itsearly stage the ocean is forced by the atmosphere, while during its late stage the atmosphere isforced by the ocean.

关键词： extended associate pattern analysis (EAPA) El nino phenomenon

UNIFICATION AND APPLICATIONS OF MODERN oceanic/ATMOSPHERIC DATA ASSIMILATION ALGORITHMS

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2004年第5期16卷 501-517页

作者： qiaoFang-li ZHANGShao-qing YUANYe-li instituteofoceanography ChineseAcademyofSciencesQingdao266071China GeophysicalFluidDynamicslaboratory PrincetonUniversityPrincetonNJ08542USA keylaboratoryof{2.ScienceandNumericalmodeling TheFirstInstituteofOceanographyStateOceanicAdministrationQingdao266061China

The key mathematics and applications of various modern atmospheric/oceanicdata assimilation methods including Optimal Interpolation (OI), 4-dimensional variational approach(4D-Var) and filters were systematically reviewed and classified. Based on the data assimilationphilosophy, i. e. , using model dynamics to extract the observational information, the commoncharacter of the problem, such as the probabilistic nature of the evolution of theatmospheric/oceanic system, noisy and irregularly spaced observations, and the advantages anddisadvantages of these data assimilation algorithms, were discussed. In the filtering framework, allmodern data assimilation algorithms were unified: OI/3D-Var is a stationary filter, 4D-Var is alinear (Kalman) filter and an ensemble of Kalman filters is able to construct a nonlinear *** nonlinear filter such as the Ensemble Kalman Filter (EN-KF), Ensemble Adjustment Kalman Filter(EAKF) and Ensemble Transformation Kalman Filter (ETKF) can, to some extent, account for thenon-Gaussian information of the prior distribution from the model. The flow-dependent covarianceestimated by an ensemble filter may be introduced to OI and 4D-Var to improve these traditionalalgorithms. In practice, the performance of algorithms may depend on the specific numerical modeland the choice of algorithm may depend on the specific problem. However, the unification ofalgorithms allows us to establish a unified test system to evaluate these algorithms, which providesmore insights into data assimilation philosophies and helps improve data assimilation techniques.

关键词： data assimilation oceanic/atmospheric system filtering optimalinterpolation (OI) 4-dimensional variational(4D-Var) approach

A possible generation mechanism of the strong current over the northwestern shelf of the South china Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2011年第3期30卷 27-32页

作者： WANG Gang qiao fangli DAI Dejun HOU Yijun key laboratory of Data Analysis and Applications （LDAA） Key laboratory of Marine Science and Numerical Modeling （MASNUM） First Institute of Oceanography State Oceanic Administration Qingdao 266061 China institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China

Continuous observation in late April 2.05 on the northwestern shelf of the South china Sea reveals vigorous strong currents, the maximum velocity of which exceeds 3.8 m/s. The strong currents occurred around spring tide period, when the internal tide waves were also expected to be vigorous. Analysis shows that the major peaks of the current power spectrum are in low frequency band. Using a numerical method applied to the actual ocean stratification, we find that the amplitude profiles of the strong current are similar to that of the currents induced by some low-mode internal waves （at diurnal or semi-diurnal frequency）. It indicates that the temporal and spatial features of strong currents were possibly induced by low frequency internal waves.

关键词： strong current internal waves Brunt-Vaisala frequency

POTENTIAL APPLICATION FOREGROUND OF OCEAN MODE IN NAVY oceanography

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2001年第3期13卷 78-83页

作者： Cui, Mao-Chang qiao, Fang-Li Zhu, Hai Guo, Bing-Huo Inst. of Oceanology Chinese Acad. of Sci. Qingdao 266071 China

Ocean mode (or quasigeostrophic wave) analysis is one of the key data processing technique in oceanic acoustic tomography experiment. A primary study on its application foreground in Navy {2. is put forward with CTD data and Carton oceanic assimilation data. It shows that the sound speed mode is not well orthogonal to each other, so that it is practically no use. However, the current mode calculated from the CTD data collected in summer as the position with weak stochastic processes and strong geostrophic balance is well orthogonal to each other, it can be used everywhere in the ocean of the similar water mass at any time as long as the basic condition serves. It can be used for decomposition and reconstruction of dynamic or quasi-dynamic factors such as seawater temperature, from which and average of salinity the sound speed profile can be composed. It also shows that the monthly James Carton assimilation data is well consistent with observation ones in subsurface layer in the region with weak current speed but not well below subsurface layer or near the Kuroshio in the western Pacific. By running a nested ocean general circulation model with adjusted vertical eddy diffusivity to do data assimilation again and applying current mode analysis to reconstruct or compose related factors, it is hopefully possible to improve the precision and space resolution of the oceanic assimilation data. So that, it is definitely possible to obtain the three dimensional high resolution distribution of ocean sound speed in real time with the satellite SST and surface wind fields only.

关键词： Data processing Real time systems Speed Temperature Tomography

Winter heat budget in the huanghai Sea and the effect from huanghai Warm Current (Yellow Sea Warm Current)

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2011年第5期30卷 56-63页

作者： qiao Lulu WANG Xiaohua WANG Yongzhi WU Dexing BAO Xianwen MU Lin key laboratory of Seafloor Science and Exploration Technology Ocean University of China Qingdao 266100 China key laboratory of Physical {2. Ministry of Education Ocean University of China Qingdao 266100 China School of Physical Environmental and Mathematical Sciences University of New South Wales at Australian Defence Force Academy Canberra Australia state key {2. of Satellite Ocean Environment Dynamics Second Institute Oceanography State Oceanic Administratim Hangzhou 310012 China the first institute of oceanography State Oceanic Administration Qingdao 266061 China National marine Data and Information Service State Oceanic Administration Tianjin 300171 China

Four sources of surface heat flux （SHF） and the satellite remote sensing sea surface temperature （SST） data are combined to investigate the heat budget closure of the huanghai Sea （HS） in *** is found that heat loss occurs all over the HS during winter and the area averaged heat content change decreases with a rate of-106 W/m *** with the area averaged SHF of-150 W/m 2.from the four SHF data sets,it can be concluded that the SHF plays a dominant role in the HS heat budget during *** contrast,the heat advection transported by the huanghai Warm Current （Yellow Sea Warm Current,HWC） accounted for up to 2.% of the HS heat content *** correlation,especially in February,between the storm events and the SST increase demonstrates that the HWC behaves strongly as a wind-driven compensation current.

关键词： heat budget huanghai Sea and Bohai Sea surface heat flux huanghai Warm Current (Yellow Sea Warm Current)

Sea level rise projection in the South china Sea from CMIP5 models

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2015年第3期34卷 31-41页

作者： huang chuanjiang {2. fangli key laboratory of {2. Science and Numerical modeling First Institute of Oceanography State Oceanic Administration

Future potential sea level change in the South china Sea （SCS） is estimated by using 2. CMIP5 models under different representative concentration pathway （RCP） scenarios. By the end of the 2.st century （2.81–2.00 relative to 1986–2.05）, the multimodel ensemble mean dynamic sea level （DSL） is projected to rise 0.9, 1.6, and 1.1 cm under RCP2.6, RCP4.5, and RCP8.5 scenarios, respectively, resulting in a total sea level rise （SLR） of 40.9, 48.6, and 64.1 cm in the SCS. It indicates that the SCS will experience a substantial SLR over the 2.st century, and the rise is only marginal larger than the global mean SLR. During the same period, the steric sea level （SSL） rise is estimated to be 6.7, 10.0, and 15.3 cm under the three scenarios, respectively, which accounts only for 16%, 2.% and 2.% of the total SLR in this region. The changes of the SSL in the SCS are almost out of phase with those of the DSL for the three scenarios. The central deep basin has a slightly weak DSL rise, but a strong SSL rise during the 2.st century, compared with the north and southwest shelves.

关键词： sea level rise South china Sea dynamic sea level steric sea level CMIP5 models

The effect of the wave-induced mixing on the upper ocean temperature in a climate model

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2008年第3期27卷 104-111页

作者： huang chuanjiang {2. fangli SONG Zhenya key laboratory of {2. Science and Numerical modeling of state oceanic administration First Institute of Oceanography State Ocean Administration Qingdao 266061 China

The significant underestimation of sea surface temperature （SST） and the temperature in the upper ocean is one of common problems in present climate models. The influence of the wave-induced mixing on SST and the temperature in the upper ocean was examined based on a global climate model. The results from the model coupled with wave-induced mixing showed a significant improvement in the simulation of SST and the temperature in the upper ocean compared with those of the original model without wave effects. Although there has still a cold bias, the new simulation is much closer to the climatology, especially in the northern ocean and tropical ocean. This study indicates that some important physical processes in the accurate simulation of the ocean may be ignored in present climate models, and the wave-induced mixing is one of those factors. Thus, the wave-induced mixing （ or the effect of surface waves） should be incorporated properly into climate models in order to simulate or forecast the ocean, then climate system, more accurately.

关键词： surface wave vertical mixing SST upper ocean temperature climate model

Tidally induced upwelling off Yangtze River estuary and in Zhejiang coastal waters in summer

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2007年第3期50卷 462-473页

作者： L XinGang1,2.3,4, qiao fangli1,2. XIA ChangShui1,2.& YUAN YeLi1,2.1 {2., state oceanic administration, qingdao 2.6061, china 2.key laboratory of marine Science and Numerical modeling (MASNUM), state oceanic administration, qingdao 2.6061, china 3 institute of Oceanology, Chinese Academy of sciences, qingdao 2.6071, china 4 Graduate University of the Chinese Academy of sciences, Beijing 100039, china the first institute of oceanography State Oceanic Administration Qingdao 266061 China key laboratory of {2. Science and Numerical modeling (MASNUM) State Oceanic Administration Qingdao 266061 China institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate University of the Chinese Academy of sciences Beijing 100039 China the first institute of oceanography State Oceanic Administration Qingdao 266061 China key laboratory of {2. Science and Numerical modeling (MASNUM) State Oceanic Administration Qingdao 266061 China

MASNUM wave-tide-circulation coupled numerical model (MASNUM coupled model, hereinafter) is de-veloped based on the Princeton Ocean Model (POM). Both POM and MASNUM coupled model are ap-plied in the numerical simulation of the upwelling off Yangtze River estuary and in Zhejiang coastal waters in summer. The upwelling mechanisms are analyzed from the viewpoint of tide, and a new mechanism is proposed. The study suggests that the tidally inducing mechanism of the upwelling in-cludes two dynamic aspects: the barotropic and the baroclinic process. On the one hand, the residual currents induced by barotropic tides converge near the seabed, and upwelling is generated to maintain mass conservation. The climbing of the residual currents along the sea bottom slope also contributes to the upwelling. On the other hand, tidal mixing plays a very important role in inducing the upwelling in the baroclinic sea circumstances. Strong tidal mixing leads to conspicuous front in the coastal waters. The considerable horizontal density gradient across the front elicits a secondary circulation clinging to the tidal front, and the upwelling branch appears near the frontal zone. Numerical experiments are de-signed to determine the importance of tide in inducing the upwelling. The results indicate that tide is a key and dominant inducement of the upwelling. Experiments also show that coupling calculation of the four main tidal constituents (M2. S2. K1, and O1), rather than dealing with the single M2.constituent, im-proves the modeling precision of the barotropic tide-induced upwelling.

关键词： upwelling dynamic mechanism numerical simulation tidal movement tidal mixing front

Effects of the surface wave-induced mixing on circulation in an isopycnal-coordinate oceanic circulation model

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2013年第5期32卷 7-14页

作者： huang chuanjiang {2. fangli WEI Zexun key laboratory of {2. Science and Numerical modeling First Institute of OceanographyState Oceanic Administration

The influence of the nonbreaking surface wave-induced mixing under the mixed layer on the oceanic cir- culation was investigated using an isopycnal-coordinate oceanic circulation model. The effect of the wave- induced mixing within the mixed layer was eliminated via a bulk mixed layer model. The results show that the wave-induced mixing can penetrate through the mixed layer and into the oceanic interior. The wave- induced mixing under the mixed layer has an important effect on the distribution of temperature of the upper ocean at middle and high latitudes in summer, especially the structure of the seasonal thermocline. Moreover, the wave-induced mixing can affect the oceanic circulation, such as western boundary currents and the North Equatorial Currents through changes of sea surface height associated with the variation of the thermal structure of the upper ocean.

关键词： wave-induced mixing oceanic interior seasonal thermocline oceanic circulation geostrophicadjustment