Author: S.G. ALDERSONPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
On embedding a mixed layer model into an ocean general circulation model
Author: S.G. ALDERSONOn Embedding a Mixed Layer Model Into an Ocean General Circulation Model
Author: S. G. AldersonOcean General Circulation Models
Author: An Embedded Mixed Layer-Ocean Circulation Model
Author: David AdamecPublisher:
ISBN:
Category : Ocean circulation
Languages : en
Pages : 70
Book Description
The rationale and numerical technique of embedding an oceanic bulk mixed layer model with a multi-level primitive equation model is presented. In addition to the usual prognostic variables that exist in a multi-level primitive equation model, the embedded model predicts the depth of the well mixed layer as well as the jumps in temperature and velocity that occur at the base of that layer. The depth of the mixed layer need not coincide with any of the fixed model levels used in the primitive equations calculations. In addition to advective changes, the mixed layer can deepen by entrainment and it can reform at a shallower depth in the absence of entrainment. When the mixed layer reforms at a shallower depth, the vertical profile of temperature below, the new, shallower mixed layer is adjusted to fit the fixed-level structure used in the primitive equations calculations using a method which conserves heat, momentum and potential energy. Finally, a dynamic stability condition, which includes a consideration of both the vertical current shear and the vertical temperature gradient, is introduced in place of the traditional 'convective adjustment)'. A two-dimensional version of the model is used to test the embedded model formulations and to study the response of the ocean to a stationary axisymmetric hurricane. The model results indicate a strong interdependence between vertical turbulent mixing and advection of heat. (Author).
Research on Modeling the Oceanic General Circulation and the Surface Mixed Layer
Author: William Lawrence GatesPublisher:
ISBN:
Category : Ocean circulation
Languages : en
Pages : 260
Book Description
Parameterization of the Oceanic Mixed Layer for Use in General Circulation Models
Author: Robert C. HealdPublisher:
ISBN:
Category : Climatology
Languages : en
Pages : 48
Book Description
The behavior of different parameterizations of mixed layer physics when used in an oceanic general circulation model (OGCM) having coarse resolution of the upper ocean is examined. The method of parameterization is expected to have an important effect on the resulting sea surface temperature, and hence affect the model's overall fidelity from the viewpoint of air-sea interaction. Tests of three possible parameterizations differ in the manner in which the mixed layer depth is determined: predetermination, diagnostic determination, or prognostic determination. The sea surface temperature is taken to be equivalent to the top OGCM layer temperature in the first two methods, while it is found prognostically in the third method. Results show that for typical forcing cases such as strong insolation, weak surface cooling or weak winds, mixing is insufficient to cause heat transfer between the top two OGCM layers, which occupy the uppermost 500 m of the model. The predetermined and diagnostically determined mixed layer depth parameterizations reduce to a diffusive mixing parameterization, while the prognostic approach satisfactorily models mixed layer depths for all forcing cases. The prognostic method also agrees most closely with the results of a mixed layer model and with observations.
Simulation of More Realistic Upper-Ocean Processes from an OGCM with a New Ocean Mixed Layer Model
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 25
Book Description
A new ocean mixed layer model (OMLM) was embedded into an ocean general circulation model (OGCM) with the aim of providing an OGCM that is ideal for application to a climate model by predicting the sea surface temperature (SST) more accurately. The results from the new OMLM showed a significant improvement in the prediction of SST compared to the cases of constant vertical mixing and the vertical mixing scheme by Pacanowski and Philander. More accurate prediction of the SST from the new OMLM reduces the magnitude of the restoring term in the surface heat flux and thus provides a simulated ocean that can be coupled to the atmospheric general circulation model more naturally. The new OMLM was also shown to improve various other features of the OGCM such as the mixed layer depth and the equatorial circulation.
The Implementation of Two Mixed-layer Schemes in the HOPE Ocean General Circulation Model
Author: M. van EijkPublisher:
ISBN: 9789036921527
Category : Boundary layer (Meteorology)
Languages : en
Pages : 27
Book Description
On Improving the Accuracy of Mixed Layer Permaterization for Ocean General Circulation Models
Author: Yuechen ZhaoNumerical Ocean Circulation Modeling
Author: Aike BeckmannPublisher: World Scientific
ISBN: 1848168241
Category : Science
Languages : en
Pages : 342
Book Description
This book offers a comprehensive overview of the models and methods employed in the rapidly advancing field of numerical ocean circulation modeling. For those new to the field, concise reviews of the equations of oceanic motion, sub-grid-scale parameterization, and numerical approximation techniques are presented and four specific numerical models, chosen to span the range of current practice, are described in detail. For more advanced users, a suite of model test problems is developed to illustrate the differences among models, and to serve as a first stage in the quantitative evaluation of future algorithms. The extensive list of references makes this book a valuable text for both graduate students and postdoctoral researchers in the marine sciences and in related fields such as meteorology, and climate and coupled biogeochemical modeling.