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Your search keyword '"Piggott, Matthew D."' showing total 2 results
Start Over Author "Piggott, Matthew D." Search Limiters Full Text Topic ocean circulation
2 results on '"Piggott, Matthew D."'

1. Lagrangian ocean analysis: Fundamentals and practices

Author

van Sebille, Erik, Griffies, Stephen M., Abernathey, Ryan, Adams, Thomas P., Berloff, Pavel, Biastoch, Arne, Blanke, Bruno, Chassignet, Eric P., Cheng, Yu, Cotter, Colin J., Deleersnijder, Eric, Döös, Kristofer, Drake, Henri F., Drijfhout, Sybren, Gary, Stefan F., Heemink, Arnold W., Kjellsson, Joakim, Koszalka, Inga Monika, Lange, Michael, Lique, Camille, MacGilchrist, Graeme A., Marsh, Robert, Mayorga Adame, C. Gabriela, McAdam, Ronan, Nencioli, Francesco, Paris, Claire B., Piggott, Matthew D., Polton, Jeff A., Rühs, Siren, Shah, Syed H.A.M., Thomas, Matthew D., Wang, Jinbo, Wolfram, Phillip J., Zanna, Laure, Zika, Jan D., Marine and Atmospheric Research, Sub Physical Oceanography, and Dep Natuurkunde

Subjects
Connectivity, Atmospheric Science, Ocean circulation, Future modelling, Particle tracking, Lagrangian analysis, Computer Science (miscellaneous), Oceanography, Geotechnical Engineering and Engineering Geology, Physics::Atmospheric and Oceanic Physics, ComputingMethodologies_COMPUTERGRAPHICS
Abstract

Lagrangian analysis is a powerful way to analyse the output of ocean circulation models and other ocean velocity data such as from altimetry. In the Lagrangian approach, large sets of virtual particles are integrated within the three-dimensional, time-evolving velocity fields. Over several decades, a variety of tools and methods for this purpose have emerged. Here, we review the state of the art in the field of Lagrangian analysis of ocean velocity data, starting from a fundamental kinematic framework and with a focus on large-scale open ocean applications. Beyond the use of explicit velocity fields, we consider the influence of unresolved physics and dynamics on particle trajectories. We comprehensively list and discuss the tools currently available for tracking virtual particles. We then showcase some of the innovative applications of trajectory data, and conclude with some open questions and an outlook. The overall goal of this review paper is to reconcile some of the different techniques and methods in Lagrangian ocean analysis, while recognising the rich diversity of codes that have and continue to emerge, and the challenges of the coming age of petascale computing.

Published
2018

2. Thetis coastal ocean model: discontinuous Galerkin discretization for the three-dimensional hydrostatic equations.

Author

Kärnä, Tuomas, Kramer, Stephan C., Mitchell, Lawrence, Ham, David A., Piggott, Matthew D., and Baptista, António M.

Subjects
GALERKIN methods, COMPUTATIONAL fluid dynamics, OCEANOGRAPHY, OCEAN circulation, HYDROSTATIC equilibrium
Abstract

Unstructured grid ocean models are advantageous for simulating the coastal ocean and river–estuary–plume systems. However, unstructured grid models tend to be diffusive and/or computationally expensive, which limits their applicability to real-life problems. In this paper, we describe a novel discontinuous Galerkin (DG) finite element discretization for the hydrostatic equations. The formulation is fully conservative and second-order accurate in space and time. Monotonicity of the advection scheme is ensured by using a strong stability-preserving time integration method and slope limiters. Compared to previous DG models, advantages include a more accurate mode splitting method, revised viscosity formulation, and new second-order time integration scheme. We demonstrate that the model is capable of simulating baroclinic flows in the eddying regime with a suite of test cases. Numerical dissipation is well-controlled, being comparable or lower than in existing state-of-the-art structured grid models. [ABSTRACT FROM AUTHOR]

Published
2018
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