Eric P. Chassignet

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The North Atlantic Oscillation is the dominant mode of atmospheric variability in the North Atlantic Sector. Basin scale changes in the atmospheric forcing significantly affect the oceans' properties and circulation. Part of the ocean's response is local and rapid (surface temperature, mixed layer depth, upper ocean heat content, surface Ekman transport,(More)
A model/data comparison was performed between simulated drifters from a high resolution numerical simulation of the North Atlantic and a data set from in-situ surface drifters. The comparison makes use of pseudo-Eulerian statistics such as mean velocity and eddy kinetic energy, and Lagrangian statistics such as integral time scales. The space and time(More)
Coordinated Ocean-ice Reference Experiments (COREs) Stephen M. Griffies *, Arne Biastoch , Claus Böning , Frank Bryan , Gokhan Danabasoglu , Eric P. Chassignet , Matthew H. England , Rüdiger Gerdes , Helmuth Haak , Robert W. Hallberg , Wilco Hazeleger , Johann Jungclaus , William G. Large , Gurvan Madec , Anna Pirani , Bonita L. Samuels , Markus Scheinert ,(More)
Gravity current entrainment is essential in determining the properties of the interior ocean water masses that result from marginal sea overflows. Although the individual entraining billows will be unresolvable in large-scale ocean models for the foreseeable future, some large-scale simulations are now being carried out that do resolve the intermediate(More)
Recent advances in computer architecture allow for numerical integration of state-of-the-art ocean models at basin scale with a grid resolution of 1/10◦ or higher. At that resolution, the Gulf Stream’s separation at Cape Hatteras is well simulated, but substantial differences from observations are still observed in its path, strength, and variability.(More)
In light of previous numerical studies demonstrating a strong sensitivity of the strength of thermohaline circulation to the representation of overflows in ocean general circulation models, the dynamics of bottom gravity currents are investigated using a two-dimensional, nonhydrostatic numerical model. The model explicitly resolves the Kelvin–Helmholtz(More)
In this paper, the statistical properties of the mean ow reconstruction using Lagrangian data are studied, considering the classical \binning" approach based on space-time averaging of nite di erence velocity estimates. The work is performed numerically, using as the test ow a solution from a high resolution MICOM simulation of the North Atlantic. A set of(More)
Building on the work by Turner [Turner, J.S., 1986. The development of the entrainment assumption and its application to geophysical flows. J. Fluid Mech. 173, 431–471] and Hallberg [Hallberg, R., 2000. Time integration of diapycnal diffusion and Richardson number dependent mixing in isopycnal coordinate ocean models. Mon. Weather Rev. 128, 1402–1419], an(More)
In light of the pressing need for development and testing of reliable parameterizations of gravity current entrainment in ocean general circulation models, two existing entrainment parameterization schemes, Kprofile parameterization (KPP) and one based on Turner s work (TP), are compared using idealized experiments of dense water flow over a constant-slope(More)