A coupled dynamic-thermodynamic model of an ice-ocean system in the marginal ice zone PDF Download
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Author: S. HAKKINEN
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: S. HAKKINEN
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 3
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Book Description
The recent article by Hakkinen [1987] creatively addresses a number of important dynamic and thermodynamic processes in the marginal ice zone (MIZ). We believe that her study will stimulate further research on the coupled ice-ocean system. For now we would like to offer the following discussion of the need to augment the entrainment equation to include surface buoyancy flux for general application to the MIZ.
Author: Sirpa Häkkinen
Publisher:
ISBN:
Category : Ocean-atmosphere interaction
Languages : en
Pages : 124
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Book Description
This study is aimed at the modelling of mesoscale processes such as up/downwelling and ice edge eddies in the marginal ice zones. A 2-dimensional coupled ice-ocean model is used for the study. The ice model is coupled to the reduced gravity ocean model (f-plane) through interfacial stresses. The constitutive equations of the sea ice are formulated on the basis of the Reiner-Rivlin theory. The internal ice stresses are important only at high ice concentrations (90-100%), otherwise the ice motion is essentially free drift, where the air-ice stress is balanced by the ice-water stress. The model was tested by studying the upwelling dynamics. Winds parallel to the ice edge with the ice on the right produce upwelling because the air-ice momentum flux is much greater than air-ocean momentum flux, and thus the Ekman transport is bigger under the ice than in the open water. The upwelling simulation was extended to include temporally varying forcing, which was chosen to vary sinusoidally with 4 day period. This forcing resembles successive cyclone passings. In the model with thin oceanic upper layer, ice bands were formed. The up/downwelling signals do not disappear in wind reversals because of nonlinear advection. This leads to convergences and divergences in oceanic and ice velocities which manifest themselves as ice banding. At least one wind reversal is needed to produce one ice band.
Author: Lakshmi H. Kantha
Publisher: Elsevier
ISBN: 0080512909
Category : Science
Languages : en
Pages : 981
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Book Description
Oceans play a pivotal role in our weather and climate. Ocean-borne commerce is vital to our increasingly close-knit global community. Yet we do not fully understand the intricate details of how they function, how they interact with the atmosphere, and what the limits are to their biological productivity and their tolerance to wastes. While satellites are helping us to fill in the gaps, numerical ocean models are playing an important role in increasing our ability to comprehend oceanic processes, monitor the current state of the oceans, and to a limited extent, even predict their future state.Numerical Models of Oceans and Oceanic Processes is a survey of the current state of knowledge in this field. It brings together a discussion of salient oceanic dynamics and processes, numerical solution methods, and ocean models to provide a comprehensive treatment of the topic. Starting with elementary concepts in ocean dynamics, it deals with equatorial, mid-latitude, high latitude, and coastal dynamics from the perspective of a modeler. A comprehensive and up-to-date chapter on tides is also included. This is followed by a discussion of different kinds of numerical ocean models and the pre- and post-processing requirements and techniques. Air-sea and ice-ocean coupled models are described, as well as data assimilation and nowcast/forecasts. Comprehensive appendices on wavelet transforms and empirical orthogonal functions are also included.This comprehensive and up-to-date survey of the field should be of interest to oceanographers, atmospheric scientists, and climatologists. While some prior knowledge of oceans and numerical modeling is helpful, the book includes an overview of enough elementary material so that along with its companion volume, Small Scale Processes in Geophysical Flows, it should be useful to both students new to the field and practicing professionals. * Comprehensive and up-to-date review* Useful for a two-semester (or one-semester on selected topics) graduate level course* Valuable reference on the topic* Essential for a better understanding of weather and climate
Author: M. IKEDA
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher: American Geophysical Union
ISBN:
Category : Oceanography
Languages : en
Pages : 289
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Book Description
Author: A.L. Berger
Publisher: Springer Science & Business Media
ISBN: 9400924461
Category : Science
Languages : en
Pages : 715
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Book Description
It has been widely recognized recently that in order to make scientific progress on large and important problems (eg, carbon dioxide effects on climate, viability of various sites for nuclear waste disposal etc.), it is necessary to integrate knowledge from wide ranging sets of disciplines. This is certainly true in the climate sciences, for progress in understanding the cause of the ice ages or the effects of industrial pollution on the future climate or even the likelihood of severe climatic consequences in the aftermath of nuclear war. All require state-of -the -art input from many geoscience disci plines climatology, oceanography, meteorology, chemistry, ecology, glaciology, geology, astronomy, space technology, computer technology, mathematics etc. Major international meetings have called for interaction of such geo-science disciplines to solve real world problems. To move beyond the rhetorical level, the NATO Special Programme on Global Transport Mechanisms in the Geo-Sciences whose activities started in 1983, deci ded to organise his closing symposium on such a topic which focus on the relationship between climate and geo-sciences. This symposium was held at the end of May 1988 at the Universite Catholique de Louvain, Louvain-Ia-Neuve, Belgium. One hundred-and-thirty participants from the 16 NATO countries and a number of non-NATO countries assembled for the Symposium. Another feature was the attendance by special invitation of 16 pro mising young scientists who might well become leading scientists on climate and geo-sciences in their respective countries in the next century.
Author: Judith A. Curry
Publisher: Academic Press
ISBN: 0121995704
Category : Medical
Languages : en
Pages : 493
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Book Description
Basic Concepts: Composition, Structure, and State. First and Second Laws of Thermodynamics. Transfer Processes. Thermodynamics of Water. Nucleation and Diffusional Growth. Moist Thermodynamics Processes in the Atmosphere. Static Stability of the Atmosphere and Ocean. Cloud Characteristics and Processes. Ocean Surface Exchanges of Heat and Freshwater. Sea, Ice, Snow, and Glaciers. Thermohaline Processes in the Ocean. Special Topics: Global Energy and Entropy Balances. Thermodynamics Feedbacks in the Climate System. Planetary Atmospheres and Surface Ice. Appendices. Subject Index.
Author: Walker O. Smith Jr.
Publisher: Academic Press
ISBN: 1483289168
Category : Science
Languages : en
Pages : 429
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Book Description
Polar Oceanography is an integrated synthesis of the biological, physical, geological, and chemical processes that occur in the polar oceans. The book represents the first modern interdisciplinary synthesis in this field.
Author: Shelley H. Riedlinger
Publisher:
ISBN:
Category :
Languages : en
Pages : 124
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Book Description
A coupled one-dimensional ice/ocean model is developed in differential form. The ice/snow system is represented by the simplified thermodynamic model of Semtner and a dynamic approximation that neglects the internal stresses. The ocean is represented by the Mellor-Yamada Level- 2 turbulence mixed-layer model. The thermodynamic coupling considers a moving ice/ocean interface and salinity flux generated by the freezing or melting of ice. The dynamic coupling occurs via the turbulent stress that exists in the mixed-layer beneath the ice. The test cases are used for model validation and scientific studies. One is the standard climatological test used by Semtner and others. The other test case is with the AIDJEX data. The ice/ocean model is compared to Semtner's ice model to determine the effect of a variable-depth mixed layer as opposed to an isothermal, fixed-depth mixed layer. The sensitivity of the ice/ocean model to changes in certain parameters and forcing is also examined. Finally, the ability of the model simulate Arctic conditions is shown by comparison of model results of data obtained during AIDJEX. Keywords: Ocean models; Sea ice; Arctic regions; Oceanographic data; Marine climatology; Diurnal variations; Heat flux; Solar radiation; Marine mixed layers.
