A Numerical Modeling Study for the Japan/East Sea (JES) Seasonal Circulation and Thermohaline Structure PDF Download
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Author: Hilbert Strauhs
Publisher:
ISBN: 9781423539803
Category : Ocean circulation
Languages : en
Pages : 97
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Book Description
The seasonal sea circulation and thermohaline structure in the Japan/ East Sea (JES) were studied numerically using the Princeton Ocean Model (POM) with the horizontal resolution varying from 11.54 to 18.53 km and 15 sigma levels conforming to a relatively realistic bottom topography. A twenty four month control run was performed using climatological monthly mean wind stresses and heat and salt fluxes as surface forcing and observational oceanic inflow/ outflow at open boundaries. The seasonally averaged effects of isolated forcing terms are presented and analyzed from the following experiments: (1) non-linear effects removed, (2) no lateral transport at open boundary, and (3) wind effects removed. This procedure allowed analysis of spatial and temporal contributions of the isolated parameter to the general hydrology of the JES and some of its specific features. Major currents are simulated reasonably well compared to the observations. The nonlinear advection does not affect the general circulation pattern evidently, but does affect the formation of the mesoscale eddies, especially the Ulleung Basin (UB) eddy (all seasons) and the Japan Basin (JB) cyclonic gyre (spring). The lateral boundary forcing enhances (weakens) the JES volume transport in the summer (winter). The wind forcing is the most important factor (80%) for the generation of the JB cyclonic gyre. It drives the Liman Current and damps the East Korean Warm Current in the winter, and generates the UB eddy, and eddies along the Japan Coast Current JCC in all seasons. However, it has almost no effect on the JCC for all seasons.
Author: Hilbert Strauhs
Publisher:
ISBN: 9781423539803
Category : Ocean circulation
Languages : en
Pages : 97
Get Book Here
Book Description
The seasonal sea circulation and thermohaline structure in the Japan/ East Sea (JES) were studied numerically using the Princeton Ocean Model (POM) with the horizontal resolution varying from 11.54 to 18.53 km and 15 sigma levels conforming to a relatively realistic bottom topography. A twenty four month control run was performed using climatological monthly mean wind stresses and heat and salt fluxes as surface forcing and observational oceanic inflow/ outflow at open boundaries. The seasonally averaged effects of isolated forcing terms are presented and analyzed from the following experiments: (1) non-linear effects removed, (2) no lateral transport at open boundary, and (3) wind effects removed. This procedure allowed analysis of spatial and temporal contributions of the isolated parameter to the general hydrology of the JES and some of its specific features. Major currents are simulated reasonably well compared to the observations. The nonlinear advection does not affect the general circulation pattern evidently, but does affect the formation of the mesoscale eddies, especially the Ulleung Basin (UB) eddy (all seasons) and the Japan Basin (JB) cyclonic gyre (spring). The lateral boundary forcing enhances (weakens) the JES volume transport in the summer (winter). The wind forcing is the most important factor (80%) for the generation of the JB cyclonic gyre. It drives the Liman Current and damps the East Korean Warm Current in the winter, and generates the UB eddy, and eddies along the Japan Coast Current JCC in all seasons. However, it has almost no effect on the JCC for all seasons.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Book Description
The second part of this work investigates the seasonal variabilities of the Japan/East Sea (JES) circulation using the U.S. Navy Generalized Digital Environmental Model (GDEM) climatological temperature and salinity dataset (public domain) on a 0.58 3 0.58 grid. A variational P-vector method was developed to invert the velocity field. The GDEM for the JES was built up on historical (1930-97) 136 509 temperature and 52 572 salinity profiles. The climatological mean and seasonal variability of the current systems are well inverted, especially the Tsushima Warm Current and its bifurcation, the East Korean Warm Current (EKWC), the Japan nearshore branch, the confluence of the EKWC, and the North Korean Cold Current near the Korean coast and flows northeastward along the subpolar front, and a mesoscale anticyclonic eddy in the Ulleng/Tsushima Basin. Furthermore, this method has the capability to invert flow reasonably well across the shallow straits such as the Tsushima/Korea, Tsugaru, and Soya Straits. The GDEM temperature and salinity and the inverted velocity fields provide balanced initial fields for JES numerical modeling and simulation.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 21
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Book Description
The seasonal variability of the Japan/East Sea (JES) circulation was studied numerically using the Princeton Ocean Model (POM) with horizontal resolution varying from 11.54 to 18.53 km and 15 sigma levels conforming to a relatively realistic bottom topography. The model was integrated using climatological monthly mean wind stresses, heat and salt fluxes as surface forcing and observational oceanic inflow/outflow at open boundaries. The seasonally averaged effects of isolated forcing terms are presented and analyzed from the following experiments: 1)non-linear effects removed,2) no lateral transport at open boundary, and 3) wind effects removed. Major currents are simulated reasonably well compared to observations. The nonlinear advection does not affect the general circulation pattern evidently, but does affect the formation of the mesoscale eddies, especially the Ulleung/Tsushima Basin (UTB) eddy (all seasons) and the Japan Basin (JB) cyclonic gyre (spring). The lateral boundary forcing enhances (weakens) the JES volume transport in the summer (winter). The wind forcing is the most important factor (80%) for generating the JB cyclonic gyre. Besides, it drives the Liman Current and damps the East Korean Warn Current in the winter, and generates the UTB eddy, and eddies along the Japan Nearshore Branch (JNB) in all seasons. However, it has almost no effect on the JNB currents for all seasons.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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Book Description
In this study, the U.S. Navy's Generalized Digital Environmental Model (GDEM) climatological temperature and salinity data on a 0.5 deg x 0.5 deg grid is used to investigate the seasonal variabilities of the Japan/East Sea (JeS) thermohaline structure and circulations. The GDEM for the JES was built up on historical (1930-97) 136 509 temperature and 52 572 salinity profiles. A three-dimensional estimate of the absolute geostrophic velocity field was obtained from the GDEM temperature and salinity fields using the P-vector method. The seasonal variabilities of the thermohaline structure and the inverted currents such as the Subpolar Front, the salinity minimum and maximum in the Japan Sea Intermediate Water, and the Tsushima Warm Current and its bifurcation are identified.
Author: V.C. Lakhan
Publisher: Elsevier
ISBN: 0080526640
Category : Science
Languages : en
Pages : 614
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Book Description
This book unifies and enhances the accessibility of contemporary scholarly research on advances in coastal modeling. A comprehensive spectrum of innovative models addresses the wide diversity and multifaceted aspects of coastal research on the complex natural processes, dynamics, interactions and responses of the coastal supersystem and its associated subsystems. The twenty-one chapters, contributed by internationally recognized coastal experts from fourteen countries, provide invaluable insights on the recent advances and present state-of-the-art knowledge on coastal models which are essential for not only illuminating the governing coastal process and various characteristics, but also for understanding and predicting the dynamics at work in the coastal system. One of the unique strengths of the book is the impressive and encompassing presentation of current functional and operational coastal models for all those concerned with and interested in the modeling of seas, oceans and coasts. In addition to chapters modeling the dynamic natural processes of waves, currents, circulatory flows and sediment transport there are also chapters that focus on the modeling of beaches, shorelines, tidal basins and shore platforms. The substantial scope of the book is further strengthened with chapters concentrating on the effects of coastal structures on nearshore flows, coastal water quality, coastal pollution, coastal ecological modeling, statistical data modeling, and coupling of coastal models with geographical information systems.
Author: Peter C. Chu
Publisher: Springer Science & Business Media
ISBN: 354033386X
Category : Science
Languages : en
Pages : 610
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Book Description
A major task for physical oceanographers is to determine the movement of oceanic water from observations. This book introduces the P-vector inverse method, with a two-step determination of the velocity from hydrographic data. The book provide insights into the basics of the P-vector inverse method and the features of the inverted global and regional ocean circulations. Upper undergraduate and graduate students as well as oceanographers, marine biologists and other environmental scientists will find this book a valuable tool for their studies.
Author: Artem S. Sarkisyan
Publisher: Springer Science & Business Media
ISBN: 1402092083
Category : Science
Languages : en
Pages : 385
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Book Description
In this wide-ranging and comprehensive review of the historical development and current status of ocean circulation models, the analysis extends from simple analytical approaches to the latest high-resolution numerical models with data assimilation. The authors, both of whom are pioneer scientists in ocean and shelf sea modelling, look back at the evolution of Western and Eastern modelling methodologies during the second half of the last century. They also present the very latest information on ocean climate modelling and offer examples for a number of oceans and shelf seas. The book includes a critical analysis of literature on ocean climate variability modelling, as well as assessing the strengths and weaknesses of the best-known modelling techniques. It also anticipates future developments in the field, focusing on models based on a synthesis of numerical simulation and field observation, and on nonlinear thermodynamic model data synthesis.
Author:
Publisher:
ISBN:
Category : Ocean circulation
Languages : en
Pages : 510
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Book Description
Author: Chin-Lung Fang
Publisher:
ISBN: 9781423500216
Category :
Languages : en
Pages : 95
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Book Description
Numerical ocean modeling usually composes various initial- and boundary-value problems. It integrates hydrodynamic and thermodynamic equations numerically with atmospheric forcing and boundary conditions (lateral and vertical) from initial states of temperature, salinity and velocity. Past observations, historical datasets and climatological datasets of the ocean have contributed greatly to the knowledge of the data fields of initial condition, atmospheric forcing and boundary conditions. Change in either initial or boundary condition leads to a variety of model solutions. It is necessary to specify realistic initial and boundary conditions to achieve better understanding and prediction of the ocean behavior. However, uncertainty often exists in both initial and boundary conditions. Up to now, most studies on ocean predictability have usually been for one particular type of model input uncertainty within the three types of uncertainty (initial conditions, open boundary conditions, atmospheric forcing function). This thesis investigates the response of ocean model to the three types of model input uncertainty simultaneously using Princeton Ocean Model (POM) implemented for the Japan/East Sea (JES).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 21
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Book Description
The autocorrelation functions of temperature and salinity in the three basins (Ulleung, Japan, and Yamato Basins) of the Japan/East Sea are computed using the U.S. Navy s Master Oceanographic Observational Dataset for 1930-97. After quality control the dataset consists of 93 810 temperature and 50 349 salinity profiles. The decorrelation scales of both temperature and salinity were obtained through fitting the autocorrelation function into the Gaussian function. The signal-to-noise ratios of temperature and salinity for the three basins are usually larger than 2. The signal-to-noise ratio of temperature is greater in summer than in winter. There is more noise in salinity than in temperature. This might be caused by fewer salinity than temperature observations. The autocorrelation functions of temperature for the three basins have evident seasonal variability at the surface: less spatial variability in the summer than in the winter. The temporal (spatial) decorrelation scale is shorter (longer) in the summer than in the winter. Such a strong seasonal variability at the surface may be caused by the seasonal variability of the net surface heat flux. The autocorrelation functions of salinity have weaker seasonal variability than those of the temperature field. The temporal and horizontal decorrelation scales obtained in this study are useful for designing an optimal observational network.
