scholarly journals On the calculation of an attenuation coefficient for transects of ice-covered ocean

2011 ◽  
Vol 468 (2137) ◽  
pp. 136-162 ◽  
Author(s):  
Luke G. Bennetts ◽  
Vernon A. Squire
Keyword(s):  
Attenuation Coefficient ◽  
General Circulation ◽  
Circulation Model ◽  
Wave Interaction ◽  
Thin Elastic Plate ◽  
Interaction Theory ◽  
Ocean Surface Waves ◽  
Averaging Methods ◽  
Oceanic General Circulation Model ◽  
Linear Setting

Exponential attenuation of ocean surface waves in ice-covered regions of the polar seas is modelled in a two-dimensional, linear setting, assuming that the sea ice behaves as a thin-elastic plate. Attenuation is produced by natural features in the ice cover, with three types considered: floes, cracks and pressure ridges. An inelastic damping parameterization is also incorporated. Efficient methods for obtaining an attenuation coefficient for each class of feature, involving an investigation of wave interaction theory and averaging methods, are sought. It is found that (i) the attenuation produced by long floes can be obtained from the scattering properties of a single ice edge; and (ii) wave interaction theory in ice-covered regions requires evanescent and damped-propagating motions to be included when scattering sources are relatively nearby. Implications for the integration of this model into an oceanic general circulation model are also discussed.

scholarly journals Past, present and impendent hydroelastic challenges in the polar and subpolar seas

2011 ◽  
Vol 369 (1947) ◽  
pp. 2813-2831 ◽  
Author(s):  
Vernon A. Squire
Keyword(s):  
Sea Ice ◽  
General Circulation ◽  
Applied Mathematics ◽  
Circulation Model ◽  
Ocean Waves ◽  
Floating Structures ◽  
Ocean Surface Waves ◽  
Pressure Ridge ◽  
Oceanic General Circulation Model ◽  
Different Thickness

Current and emergent advances are examined on the topic of hydroelasticity theory applied to natural sea ice responding to the action of ocean surface waves and swell, with attention focused on methods that portray sea ice more faithfully as opposed to those that oversimplify interactions with a poor imitation of reality. A succession of authors have confronted and solved by various means the demanding applied mathematics associated with ocean waves (i) entering a vast sea-ice plate, (ii) travelling between plates of different thickness, (iii) impinging on a pressure ridge, (iv) affecting a single ice floe with arbitrarily specified physical and material properties, and (v) many such features or mixtures thereof. The next step is to embed simplified versions of these developments in an oceanic general circulation model for forecasting purposes. While targeted on specific sea-ice situations, many of the reported results are equally applicable to the interaction of waves with very large floating structures, such as pontoons, floating airports and mobile offshore bases.

Modeling a 200-Yr Interruption of the Holocene Sapropel S1

2000 ◽  
Vol 53 (1) ◽  
pp. 98-104 ◽  
Author(s):  
Paul G. Myers ◽  
Eelco J. Rohling
Keyword(s):  
General Circulation Model ◽  
General Circulation ◽  
Deep Convection ◽  
Circulation Model ◽  
Intermediate Water ◽  
Gulf Of Lions ◽  
The Holocene ◽  
Circulation Mode ◽  
Oceanic General Circulation Model ◽  
Water Formation

AbstractAn oceanic general circulation model, previously used to simulate the conditions associated with the Holocene Sapropel S1, is used to simulate the effects of a climate deterioration (represented as a cooling event) on the sapropelic circulation mode. The enhanced cooling (2°–3°C) induces deep convection in the Adriatic and the Gulf of Lions and intermediate water formation in the Aegean, where in all cases there had previously been only stagnant unventilated waters. The depths of ventilation (to ∼1250 m) are in agreement with core data from this period. The short decadal timescales involved in modifying the sapropelic circulation suggest that such a climatic deterioration may be associated with the interruption of S1 between 7100 and 6900 14C yr B.P., which divided the sapropel into two subunits.

scholarly journals Importance of the Vertical Resolution in Simulating SST Diurnal and Intraseasonal Variability in an Oceanic General Circulation Model

2017 ◽  
Vol 30 (11) ◽  
pp. 3963-3978 ◽  
Author(s):  
Xuyang Ge ◽  
Wanqiu Wang ◽  
Arun Kumar ◽  
Ying Zhang
Keyword(s):  
Temperature Gradient ◽  
General Circulation Model ◽  
General Circulation ◽  
Circulation Model ◽  
Vertical Resolution ◽  
Vertical Temperature Gradient ◽  
Vertical Temperature ◽  
Sst Variability ◽  
Oceanic General Circulation Model ◽  
High Vertical Resolution

Abstract In this paper, the influence of high vertical resolution near the surface in an oceanic general circulation model in simulating the observed sea surface temperature (SST) variability is investigated. In situ observations of vertical temperature profiles are first used to quantify temperature variability with depth near the ocean surface. The analysis shows that there is a sharp vertical temperature gradient within the top 10 m of the ocean. Both diurnal and intraseasonal variabilities of the ocean temperatures are largest near the surface and decrease with the ocean depth. Numerical experiments with an oceanic general circulation model are next carried out with 1- and 10-m vertical resolutions for the upper ocean to study the dependence of the simulated SST and vertical temperature structure on the vertical resolution. It is found that the simulated diurnal and intraseasonal variabilities, as well as the associated vertical temperature gradient near the surface, are strongly influenced by the oceanic vertical resolution, with the 1-m vertical resolution producing a stronger vertical temperature gradient and temporal variability than the 10-m vertical resolution. These results suggest that a realistic representation of SST variability with a high vertical resolution in the upper ocean is required for a coupled atmosphere–ocean model to correctly simulate the observed tropical intraseasonal oscillations, including the Madden–Julian oscillation and the boreal summer monsoon intraseasonal oscillation, which are strongly linked with the underlying SST.

An eddy-permitting oceanic general circulation model and its preliminary evaluation

2004 ◽  
Vol 21 (5) ◽  
pp. 675-690 ◽  
Author(s):  
Liu Hailong ◽  
Zhang Xuehong ◽  
Li Wei ◽  
Yu Yongqiang ◽  
Yu Rucong
Keyword(s):  
General Circulation Model ◽  
General Circulation ◽  
Circulation Model ◽  
Preliminary Evaluation ◽  
Oceanic General Circulation Model
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