检索结果-南通市图书馆

Chinese Journal of Oceanology and Limnology 1996年第2期14卷 128-134页

作者：鲍献文方欣华刘学刚 Physical Oceanography Institute Ocean University of Qingdao Qingdao North China Sea Administration SOA Qingdao

Eighy-one CTD profiles gathered in springtime were used for northem East China Sea tbermohalinefinestructure studies indicating that the finestructure properties vaned with region and depth, as shown infinesructure specra, distribution of Cox numbers etc..Some results closely wiated to distribution of watermasses and Analysis of two typical profiles revealed differenes in autospectra of temperature,salihity and potential density gradients, probobility distribution of temperature finestructure gradient,Cox ***. The probability density function of vertical temperature gradients, which varied withsample interval, is given. The variances of temperatare finestructare gradient are used to estimate the lat-eral diffusivity and lateral temperatare flux, which were 10.3 （m2/s） and 5.5×10-4 （℃ m/s）,respectivly.

关键词： finestructure thermohaline Kuroshio East China Sea spectrum

A Three-Box Model of thermohaline Circulation under the Energy Constraint

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第5期28卷 292-295页

作者： SHEN Yang GUAN Yu-Ping LIANG Chu-Jin CHEN Da-Ke College of Science Liaoning University of TechnologyJinzhou 121001 Key Laboratory of Tropic Marine Environment Dynamics Chinese Academy of SciencesGuangzhou 510301 State Key Laboratory of Satellite Ocean Environment Dynamics Hangzhou 310012

The driving mechanism of thermohaline circulation is still a controversial topic in physical *** theory is based on Stommel's two-box model under buoyancy ***,Guan and Huang proposed a new viewpoint in the framework of energy constraint with a two-box *** extend it to a three-box model,including the effect of wind-driven *** this simple model,we further study how ocean mixing impacts on thermohaline circulation under the energy constraint.

关键词： circulation ocean thermohaline

Three-dimensional thermohaline anomaly structures of rings in the Kuroshio Extension region

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2020年第3期39卷 25-35页

作者： Ya’nan Ding Chunsheng Jing Third Institute of Oceanography Ministry of Nature ResourcesXiamen 361005China

Using AVISO satellite altimeter observations during 1993–2015 and a manual eddy detection method, a total of 276 anticyclonic rings and 242 cyclonic rings shed from the Kuroshio Extension(KE) were identified, and their three-dimensional(3D) anomaly structures were further reconstructd based on the Argo float data and the Japan Agency for Marine-Earth Science and Technology(JAMSTEC) cruise and buoy data through an interpolation method. It is found that the cyclonic(anticyclonic) rings presented consistent negative(positive) anomalies of potential temperature;meanwhile the relevant maximum anomaly center became increasingly shallow for the cyclonic rings whereas it went deeper for the anticyclonic rings as the potential temperature anomaly decreased from the west to the east. The above deepening or shoaling trend is associated with the zonal change of the depth of the main thermocline. Moreover, the composite cold ring between 140° and 150°E was found to exhibit a double-core vertical structure due to the existence of mode water with low potential vorticity. Specifically, a relatively large negative(positive) salinity anomaly and a small positive(negative) one appeared for the composite cyclonic(anticyclonic) ring at the depth above and below 600 m, respectively. The underlying driving force for the temperature and salinity anomaly of the composite rings was also attempted, which varies depending on the intensity of the background current and the temperature and salinity fields in different areas of the KE region, and the rings’ influences on the temperature and salinity could reach deeper than 1 000 m on average.

关键词： Kuroshio Extension pinched-off ring thermohaline anomaly three-dimensional structure composite eddy

Seasonal characteristics and formation mechanism of the thermohaline structure of mesoscale eddy in the South China Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2019年第4期38卷 29-38页

作者： Yongcan Zu Shuangwen Sun Wei Zhao Peiliang Li Baochao Liu Yue Fang Azizan Abu Samah College of Oceanic and Atmospheric Sciences Ocean University of China Center for Ocean and Climate Research First Institute of OceanographyMinistry of Natural Resources Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology (Qingdao) Ocean College Zhejiang University Institute of Ocean and Earth Sciences University of Malaya

The seasonal characteristics and formation mechanism of the thermohaline structure of mesoscale eddy in the South China Sea are investigated using the latest eddy dataset and ARMOR3D data. Eddy-centric composites reveal that the horizontal distribution of temperature anomaly associated with eddy in winter is more of a dipole pattern in upper 50 m and tends to be centrosymmetric below 50 m, while in summer the distribution pattern is centrosymmetric in the entire water column. The horizontal distribution of eddy-induced salinity anomaly exhibits similar seasonal characteristics, except that the asymmetry of the salinity anomaly is weaker. The vertical distribution of temperature anomaly associated with eddy shows a monolayer structure, while the salinity anomaly demonstrates a triple-layer structure. Further analysis indicates that the vertical distribution of the anomalies is related to the vertical structure of background temperature and salinity fields, and the asymmetry of the anomalies in upper 50 m is mainly caused by the horizontal advection of background temperature and salinity.

关键词： mesoscale eddy thermohaline structure seasonal characteristics South China Sea

Simulation of Seasonal Circulations and thermohaline Variabilities in the Gulf of Thailand

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2008年第3期25卷 489-506页

作者： Nitima ASCHARIYAPHOTHA Prungchan WONGWISES Somchai WONGWISES Usa Wannasingha HUMPHRIES 游小宝 The Joint Graduate School of Energy and Environment King Mongkut's University of Technology Thonburi The Joint Graduate School of Energy and Environment King Mongkut's University of Technology ThonburiBangkok 10140Thailand Department of Mechanical Engineering King Mongkut's University of Technology ThonburkBangkok 10140Thailand Department of Mathematics King Mongkut's University of Technology ThonburiBangkok 10140Thailand Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029

Based on the Princeton Ocean Model （POM）, the seasonal thermohaline feature and the ocean circulation in the Gulf of Thailand （GOT）, situated between 6°N to 14°N latitude and 99°E to 105°E longitude, were studied numerically with 37 × 97 orthogonal curvilinear grid and 10 vertical sigma levels conforming to a realistic bottom topography. A spin-up phase of the first model run was executed using wind stress calculated from climatological monthly mean wind, restoring-type surface heat and salt, and climatological monthly mean fresh water flux data. In this paper, the temperature and salinity fields taken from Levitus94 data sets and the calculated temperature and salinity from the model run for 12-month mean and for each season are presented where the winter, summer, rainy, and end of the rainy seasons of Thailand are represented by the months January, April, July, and October, respectively. The simulated circulations are also described. The results show that the temperature in the GoT is warmer than the temperature of the other parts connected to the South China Sea （SCS）. At any depth of inflow from SCS into the GoT, the salinity is high, but in the outflow from the GoT at the surface, the salinity is low. The strong circulations are clockwise during summer and the rainy seasons of Thailand, which are the East Asian monsoon periods, northeasterly and southwesterly during summer. They occur near Pattani and Narathiwat provinces during summer and in the central GoT during the rainy seasons. Sensitivity experiments were designed to investigate the effects of wind forcing and open boundary conditions. Wind forcing is shown to be the important factor for generating the circulation in the GoT. The lateral velocity at the open boundaries is of considerable importance to current circulation for the rainy and end of the rainy seasons, with insignificant effect for the winter and summer seasons of Thailand.

关键词： seasonal circulation Gulf of Thailand spin-up phase thermohaline curvilinear grid

The relationship between the thermohaline circulation and climate variability

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2000年第11期45卷 1052-1056页

作者： ZHOU Tianjun ZHANG Xuehong WANG Shaowu State Key Laboratory of Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Geophysical Department Peking UniversityBeijing 100871China

The long-term integration with the Global Ocean-Atmosphere-Land System model of the State Key Laboratory of Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics(IAP), Chinese Academy of Sciences has been used in the investigations on the relationship between the thermohaline circulation and climate variability. The results show that the strength of the North Atlantic thermohaline circulation (THC) is negatively correlated with the North Atlantic Oscillation (NAO). Based on this kind of relationship, and also the instrument-measured climate record such as air pressure and sea surface temperature, the activity of the thermohaline circulation during the 20th century has been evaluated. The inferred variations of the strength of the THC is that, during two multi-decadal periods of 1867-1903 and 1934-1972, the THC is estimated to have been running stronger, whereas during the two periods of 1904-1933 and 1973-1994, it appears to have been weaker.

关键词： thermohaline circulation North Atlantic Oscillation climate variability.

DYNAMIC AND thermohaline PROPERTIES OF THE MINDANAO UNDERCURRENT,PART Ⅱ: thermohaline STRUCTURE

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 1998年第3期16卷 206-213页

作者：王凡胡敦欣 Institute of Oceanology Chinese Academy of Sciences Qingdao

Hydrographic data from eleven 1986 - 1991 cruises at zonal sections near 8°N from the Philippine coast to 130°E were used to examine thermohaline smictim and waer mass properties of the western boundary cnrrents there, especially those of the Mindanao Underconnt (MUC). The finding that the MLC consisted of two water masses with salinity of M.6 at 26.9 σt and 34.52 at 27. 2 σt which were remnants of the lower part of the southern Pacific Subtropical Waer (SPSW) and of the Antarctic Intermediate Water (AAIW) of South Pacific origin, respectively, showed that the MUC was not a local transient but originaed elsewhere. As the MUC flowed from 7 .5°N to 8°N, part of it carrying the SPSW turns anticyclonically and eastward. The Northem Pacilic Intermediate Watr (NPIW) often joins the MUC, which suggests that the NPIW carried by the MC partly to northward as a result of the shear between the MC and the MUC or other proceesses. The shear instability provides the energy for the irregular fluctuation of the MUC.

关键词： Mindanao Undercurrent (MUC) thermohaline structure Antarctic Intermediate Water Southern Pacific Subtropical Water Northern Pacific Intermediate Water

A THEORETICAL SOLUTION FOR THE thermohaline CIRCULATION IN THE SOUTHERN YELLOW SEA

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 1992年第4期10卷 289-300页

作者：冯明胡敦欣李永祥 Institute of Oceanology . Academia Sinica Qingdao 266071

Application of the thermocline equations in the thermocline areas and the boundary layer and the asymptotic matching techniques in each boundary in order to satisfy the surface and bottom conditions yielded a theoretical 2- D solution of the vertical thermohaline circulation of the Southern Yellow Sea in summer when the quasi-statically varying seasonal thermocline (density layer) is the background density structure , the deviations from which cause the secondary vertical circulation . The results show that the thermocline can be considered as an internal boundary or a barrier to the vertical heat advection so that in the central areas of the Southern Yellow Sea or the center of the Yellow Sea Cold Water Mass(YCWM)> the downwelling in the upper layer and upwelling in the lower or bottom layer form a double cell vertical circulation . The solution is similar to Hu’s conceptual model ( 1986) in the central areas of the YCWM and is consistent with observed temperature . salinity and dissolved oxygen

关键词： Yellow Sea Cold Water Mass. thermohaline circulation boundary layer

On the Stationary Convection of thermohaline Problems of Veronis and Stern Types

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics 2010年第5期1卷 400-405页

作者： Joginder S. Dhiman Praveen K. Sharma Poonam Sharma 不详

The stability of thermohaline convection problems of Veronis and Stern types for stationary convection is studied for quite general nature of boundaries. It is shown by means of an appropriately chosen linear transformation, that in case of stationary convection the equations describing the eigenvalue problem for thermohaline convection problems are identical to equations describing the eigenvalue problem for classical Bénard convection problem. As a consequence, the values of the critical Rayleigh numbers for the onset of stationary convection in thermohaline convection problems are obtained. Also, necessary conditions for the validity of principle of exchange of stabilities for thermohaline convection problems are derived using variational principle.

关键词： thermohaline Convection Stationary Convection Eigenvalue Problem Principle of Exchange of Stabilities Rayleigh Number

Effects of Monsoon Winds and Topographical Features on the Vertical thermohaline and Biogeochemical Structure in the Gulf of Tadjourah (Djibouti)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Marine Science 2016年第3期6卷 440-455页

作者： Youssouf Moussa Omar Laurent Memery Xavier Carton Abdourahman Daher Eric Duvielbourg Centre d’Etude et de Recherche de Djibouti Route de l’aéroport Djibouti Djibouti Laboratoire des sciences de l’environnement Marin (LEMAR) Institut Universitaire Européen de la Mer (IUEM) Technopole Brest Iroise Plouzané France Université de Bretagne Occidentale (UBO) Laboratoire de physique de l’Océan Brest France

The vertical thermohaline and biogeochemical structures of the upper layer (0 - 200 m) were studied in the Gulf of Tadjourah using high-resolution hydrographic data collected in July-August 2013, September 2013 and February 2014. During summer, the superficial layer consisted of the mixed layer (ML) extending to a depth of about 20 - 30 m followed by the thermocline located between 30 and 50 m depth. The ML was thicker in the west and the southeast where the thermal gradient and chlorophyll a concentrations were particularly high. During September, this stratification persisted but the ML became warmer and saltier and the thermocline moved slightly deeper. In February, the ML extended to about 120 m, and the thermocline was less pronounced. A comparison of the directly measured currents to the wind induced Ekman current and to geostrophic velocity profiles revealed that the thermohaline and the biogeochemical features in summer were related to the southwest monsoon (SWM). The SWM drives surface water from the Gulf of Tadjourah to the Gulf of Aden and thus induces westward intrusion of the high salinity thermocline water from the Gulf of Aden;this near surface flow mixes surface waters in the extreme west of the Gulf of Tajourah. In contrast, the northeast monsoon (NEM), predominant in winter, brings cold water toward the Gulf of Tadjourah and thickens the ML through convective mixing. Our study shows that the SWM plays a crucial role in the stratification of the water column during summer but bathymetry influences its effects. The bowl-shape of the basin and its elongated slope in the west enhance the upwelling in this area where negative sea surface temperature anomalies and high chlorophyll a concentrations were observed.

关键词： thermohaline Biogeochemical Structures Mixed Layer Depth Thermocline Monsoon Wind Topography