Showing papers in "Ocean Modelling in 2015"

TL;DR: In this article, a nonlinear wind input term developed accounts for dependence of the growth on wave steepness, airflow separation, and for negative growth rate under adverse winds, which is consistent with the observed decay rate of ocean swell.

TL;DR: In this article, the authors analyzed the performance of the wave model Wavewatch III ® forced by a limited area atmospheric model in the Mediterranean Sea and compared the simulation results to buoy measurements through single point statistical indicators such as normalized bias and symmetrically normalized root mean square error.

TL;DR: In the second phase of the Coordinated Ocean-ice Reference Experiments (CORE-II) as discussed by the authors, the authors present an analysis of the representation of the Antarctic Circumpolar Current (ACC) and Southern Ocean meridional overturning circulation (MOC) in a suite of seventeen global ocean-sea ice models.

TL;DR: A new set of approximations to the standard TEOS-10 equation of state follow a polynomial form, making it computationally efficient for use in numerical ocean models, and two versions are provided, the first being a fit of density for Boussinesq ocean models and the second fitting specific volume which is more suitable for compressible models.

TL;DR: A new vertical coordinate system for cross-scale applications that allows each node of the grid to have its own vertical grid, while still maintaining reasonable smoothness across horizontal and vertical dimensions is presented.

TL;DR: In this article, three-hourly winds simulated by four separate GCMs were used to generate an ensemble of wave conditions for a recent historical time-period (1976-2005) and projections for the mid and latter parts of the 21st century under two radiative forcing scenarios (RCP 4.5 and RCP 8.5), as defined by the fifth phase of the Coupled Model Intercomparison Project (CMIP5) experiments.

TL;DR: In this paper, the authors developed the concept of vertically adaptive coordinates for ocean models, where zooming of vertical coordinates at locations of strong stratification (and shear) is imposed.

TL;DR: In this article, the authors evaluate spurious diapycnal mixing in MPAS-Ocean in several idealized test cases as well as real-world domains with full bathymetry.

TL;DR: In this paper, the authors present a novel framework for regional wave climate projections and its application in the European region, which is based on a statistical downscaling approach to analyze changes in wave dynamics under different scenarios in the Northeast Atlantic Ocean and the Mediterranean.

TL;DR: In this paper, a two-layer model for granular landslide motion and tsunami wave generation is developed and tested using a depth-averaged coordinate system, taking into account the dynamic interaction between the lower-layer granular landslides and upper-layer water motion.

TL;DR: In this paper, the seasonal cycle of submesoscale flows in the upper ocean is investigated in an idealised model domain analogous to mid-latitude open ocean regions, and the degree of geostrophic balance falls as the resolution is made finer, with evidence for stronger nonlinear and high frequency processes becoming more important as the mixed layer deepens.

TL;DR: This paper characterised the representation of the Southern Ocean water mass structure and sea ice within a suite of 15 global ocean-ice models run with the Coordinated Ocean-ice Reference Experiment Phase II (CORE-II) protocol.

TL;DR: In this article, the authors proposed a parameterization of energy backscatter based on an explicit sub-grid EKE budget, which is formulated deterministically via a negative viscosity.

TL;DR: In this paper, the dynamical core of a new sea ice model is presented, which is based on the Elasto-Brittle rheology, inspired by progressive damage models used for example in rock mechanics.

TL;DR: In this paper, an improved energy budget-based parameterization for the mesoscale eddy diffusivity was proposed, and a series of numerical simulations were performed, using an idealized flat-bottomed β-plane channel configuration with quadratic bottom drag.

TL;DR: In this paper, an unstructured grid circulation model based on linear finite element and finite volume formulations is evaluated against a high-resolution data set, obtained in a river-dominated mesotidal estuary with autonomous underwater vehicles and a shipborne winched profiler.

TL;DR: Stochastic superparameterization, a stochastic parameterization framework based on a multiscale formalism, is developed for mesoscale eddy parameterization in coarse-resolution ocean modeling as discussed by the authors.

TL;DR: A rigorous level- set methodology for distance-based coordination of vehicles operating in minimum time within strong and dynamic ocean currents and an efficient, non-intrusive technique for level-set-based time-optimal path planning in the presence of moving obstacles are obtained.

TL;DR: In this paper, a class of constrained weighted least squares optimizations is defined to best fit first-guess velocities while satisfying the complex bathymetry, coastline and divergence strong constraints.

TL;DR: In this paper, a leading-order approximation of the Stokes drift for a random sea in deep water is proposed to incorporate the systematic effects of wave spreading and wave age and depth.

TL;DR: In this article, the authors compare the skill of 27 pairs of initialized and uninitialized seasonal Arctic sea ice hindcasts spanning 1983-2009, driven by the same atmospheric forcing as to isolate the pure role of initial conditions on the prediction skill.

TL;DR: In this paper, the authors investigated the use of artificial neural networks (ANNs) fed with reanalysis wind data to extend an observed time series of significant wave heights, considering the influence of the distance of input points and of the number of lags.

TL;DR: In this paper, a new method is presented for a physically based statistical description of wind wave climatology, which applies spectral partitioning to identify individual wave systems (partitions) in time series of 2D-wave spectra, followed by computing the probability of occurrence of their (peak) position in frequency-direction space.

TL;DR: In this paper, an experimental model of transmission of ocean waves by an ice floe is presented, where thin plastic plates with different material properties and thicknesses are used to model the floe.

TL;DR: In this article, the authors introduce a new climatological data set of river discharge and river water temperature with 1/6° grid spacing over the Arctic region (Arctic River Discharge and Temperature; ARDAT), incorporating observations from 30 Arctic rivers.

TL;DR: In this paper, a joint scaling dependent on both local bottom slope and normalized wave number is presented and shown to resolve the issue of under-prediction of significant wave heights over horizontal bathymetries.

TL;DR: In this paper, a combined algorithm is proposed to mitigate vertical CFL restriction in a terrain-following oceanic model with an Eulerian vertical coordinate and an explicit vertical advection scheme, while at the same time avoiding numerical inaccuracies associated with standard implicit schemes.

TL;DR: The authors examined the sensitivity of the Weddell and Ross seas to vertical mixing and surface freshwater forcing using an ocean-sea ice model and showed that insufficient vertical mixing, freshwater supply from the Antarctic Ice Sheet, or initial sea ice causes a high salinity bias in the mixed layer which erodes the stratification and causes excessive deep convection.

TL;DR: In this article, the authors developed a framework for dynamically consistent parameterization of mesoscale eddy effects for use in non-eddy-resolving ocean circulation models, where the parameterization locally approximates transient eddy flux divergence by spatially localized and temporally periodic forcing, referred to as the plunger, and focuses on the linear dynamics flow solution induced by it.

TL;DR: In this article, the effect of the ice surface roughness (basal roughness) on melting and refreezing is investigated with idealised ice shelf-ocean numerical simulations.