Parameterization of the Oceanic Mixed Layer for Use in General Circulation Models PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Parameterization of the Oceanic Mixed Layer for Use in General Circulation Models PDF full book. Access full book title Parameterization of the Oceanic Mixed Layer for Use in General Circulation Models by Robert C. Heald. Download full books in PDF and EPUB format.
Author: Robert C. Heald Publisher: 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.
Author: Robert C. Heald Publisher: 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.
Author: Eric P. Chassignet Publisher: Springer Science & Business Media ISBN: 9401150966 Category : Science Languages : en Pages : 459
Book Description
The realism of large scale numerical ocean models has improved dra matically in recent years, in part because modern computers permit a more faithful representation of the differential equations by their algebraic analogs. Equally significant, if not more so, has been the improved under standing of physical processes on space and time scales smaller than those that can be represented in such models. Today, some of the most challeng ing issues remaining in ocean modeling are associated with parameterizing the effects of these high-frequency, small-space scale processes. Accurate parameterizations are especially needed in long term integrations of coarse resolution ocean models that are designed to understand the ocean vari ability within the climate system on seasonal to decadal time scales. Traditionally, parameterizations of subgrid-scale, high-frequency mo tions in ocean modeling have been based on simple formulations, such as the Reynolds decomposition with constant diffusivity values. Until recently, modelers were concerned with first order issues such as a correct represen tation of the basic features of the ocean circulation. As the numerical simu lations become better and less dependent on the discretization choices, the focus is turning to the physics of the needed parameterizations and their numerical implementation. At the present time, the success of any large scale numerical simulation is directly dependent upon the choices that are made for the parameterization of various subgrid processes.
Author: Aike Beckmann Publisher: 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.
Author: Robert William Davies Publisher: ISBN: Category : Meteorology Languages : en Pages : 55
Book Description
The study is directed toward improving an existing general circulation model (Haney, 1974) through the inclusion of time dependent surface boundary conditions and a wind mixing parameterization. Climatological atmospheric values, functions of time, provided the model the needed parameters in order to calculate solar insolation, longwave back radiation from the ocean, sensible heat exchange and latent heat exchange. The mixing parameterization involved the use of the Monin-Obukov length scale as a measure of the mixed-layer depth. The first law of thermodynamics was used to calculate the form of eddy flux above the mixed layer depth. A one-dimensional model using two different types of boundary conditions was used to test various parameters and ideas. The boundary condition similar to that used in the baroclinic model produced results through an interacting system that appeared similar to observations at Ocean Station 'N' in the North Pacific Ocean.
Author: Guy P. Brasseur Publisher: Cambridge University Press ISBN: 1108210953 Category : Science Languages : en Pages : 631
Book Description
Mathematical modeling of atmospheric composition is a formidable scientific and computational challenge. This comprehensive presentation of the modeling methods used in atmospheric chemistry focuses on both theory and practice, from the fundamental principles behind models, through to their applications in interpreting observations. An encyclopaedic coverage of methods used in atmospheric modeling, including their advantages and disadvantages, makes this a one-stop resource with a large scope. Particular emphasis is given to the mathematical formulation of chemical, radiative, and aerosol processes; advection and turbulent transport; emission and deposition processes; as well as major chapters on model evaluation and inverse modeling. The modeling of atmospheric chemistry is an intrinsically interdisciplinary endeavour, bringing together meteorology, radiative transfer, physical chemistry and biogeochemistry, making the book of value to a broad readership. Introductory chapters and a review of the relevant mathematics make this book instantly accessible to graduate students and researchers in the atmospheric sciences.
Author: David G. Andrews Publisher: Academic Press ISBN: 0080954677 Category : Science Languages : en Pages : 502
Book Description
For advanced undergraduate and beginning graduate students in atmospheric, oceanic, and climate science, Atmosphere, Ocean and Climate Dynamics is an introductory textbook on the circulations of the atmosphere and ocean and their interaction, with an emphasis on global scales. It will give students a good grasp of what the atmosphere and oceans look like on the large-scale and why they look that way. The role of the oceans in climate and paleoclimate is also discussed. The combination of observations, theory and accompanying illustrative laboratory experiments sets this text apart by making it accessible to students with no prior training in meteorology or oceanography. * Written at a mathematical level that is appealing for undergraduates and beginning graduate students * Provides a useful educational tool through a combination of observations and laboratory demonstrations which can be viewed over the web * Contains instructions on how to reproduce the simple but informative laboratory experiments * Includes copious problems (with sample answers) to help students learn the material.
Author: Rick Salmon Publisher: Oxford University Press ISBN: 0195355326 Category : Science Languages : en Pages : 393
Book Description
Lectures on Geophysical Fluid Dynamics offers an introduction to several topics in geophysical fluid dynamics, including the theory of large-scale ocean circulation, geostrophic turbulence, and Hamiltonian fluid dynamics. Since each chapter is a self-contained introduction to its particular topic, the book will be useful to students and researchers in diverse scientific fields.
Author: Robert C. Heald
Author: Robert C. Heald
Author: Young June Han
Author: William Lawrence Gates
Author: Eric P. Chassignet
Author: Aike Beckmann
Author: Robert William Davies
Author: 
Author: Guy P. Brasseur
Author: David G. Andrews
Author: Rick Salmon