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- ROLAND A, ROGER M. SAMELSON
- 2002

The hydrostatic equations of motion for ocean circulation, written in terms of pressure as the vertical coordinate, and without making the Boussinesq approximation in the continuity equation, correspond very closely with the hydrostatic Boussinesq equations written in terms of depth as the vertical coordinate. Two mathematical equivalences between these… (More)

- Dudley B Chelton, Peter Gaube, Michael G Schlax, Jeffrey J Early, Roger M Samelson
- Science
- 2011

Oceanic Rossby waves have been widely invoked as a mechanism for large-scale variability of chlorophyll (CHL) observed from satellites. High-resolution satellite altimeter measurements have recently revealed that sea-surface height (SSH) features previously interpreted as linear Rossby waves are nonlinear mesoscale coherent structures (referred to here as… (More)

- R. M. SAMELSON, E. D. SKYLLINGSTAD, D. B. CHELTON, S. K. ESBENSEN, L. W. O’NEILL, N. THUM
- 2006

A simple quasi-equilibrium analytical model is used to explore hypotheses related to observed spatial correlations between sea surface temperatures and wind stress on horizontal scales of 50–500 km. It is argued that a plausible contributor to the observed correlations is the approximate linear relationship between the surface wind stress and stress… (More)

- R M Samelson
- Annual review of marine science
- 2013

Lagrangian motion in geophysical fluids may be strongly influenced by coherent structures that support distinct regimes in a given flow. The problems of identifying and demarcating Lagrangian regime boundaries associated with dynamical coherent structures in a given velocity field can be studied using approaches originally developed in the context of the… (More)

- R. Samelson, P. Barbour, +7 authors J. Wilczak
- 2002

[1] The wind stress forcing of the Oregon coastal ocean during June–August 1999 is estimated from a regional mesoscale atmospheric model and from satellite scatterometer observations, supplemented by moored and coastal surface data and by a land-based wind profiler. Both the mean and variable components of model alongshore wind stress increase by factors of… (More)

The local predictability of the El Niño–Southern Oscillation (ENSO) is examined by the analysis of the evolution of small disturbances to an unstable 4.3-yr ENSO cycle in the Cane–Zebiak model forced by perpetual July conditions. The 4.3-yr cycle represents the dominant near-recurrent behavior in this weakly chaotic regime, so analysis of this single cycle… (More)

The growth of linear disturbances to stable and unstable time-periodic basic states is analyzed in an asymptotic model of weakly nonlinear, baroclinic wave–mean interaction. In this model, an ordinary differential equation for the wave amplitude is coupled to a partial differential equation for the zonal-flow correction. Floquet vectors, the eigenmodes for… (More)

An analytical model of subtropical mode water is presented, based on ventilated thermocline theory and on numerical solutions of a planetary geostrophic basin model. In ventilated thermocline theory, the western pool is a region bounded on the east by subsurface streamlines that outcrop at the western edge of the interior, and in which additional dynamical… (More)

- Roger Samelson, Roger Temam, Cheng Wang, Shouhong Wang
- SIAM J. Numerical Analysis
- 2003

Numerical methods for the primitive equations (PEs) of oceanic flow are presented in this paper. First, a two-dimensional Poisson equation with a suitable boundary condition is derived to solve the surface pressure. Consequently, we derive a new formulation of the PEs in which the surface pressure Poisson equation replaces the nonlocal incompressibility… (More)

- R. M. Samelson
- 2004

Two idealized, three-dimensional, analytical models of mid-depth meridional overturning in a basin with a southern-hemisphere circumpolar connection are described. In the first, the overturning circulation can be understood as a ‘pump and valve’ system, in which the wind forcing at the latitudes of the circumpolar connection is the pump, and surface… (More)