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Over the last several years, we have developed
a three-dimensional numerical oceanic model intended for simulating currents,
ecosystems, biogeochemical cycles, and sediment movement in various coastal
regions. It is called the Regional Oceanic Modeling System (ROMS),
and it is closely related to the model developed at Rutgers
University with the same name.
click on above images for enlargement with
caption
ROMS Functionality
ROMS Scientists
Selected References
ROMS Functionality
- The model solves the hydrostatic Primitive Equations
in vertical hybrid-$\sigma$ and horizontal curvilinear coordinates with
innovative algorithms for advection, mixing, pressure gradient, vertical-mode
coupling, time stepping, and parallel efficiency (Shchepetkin and McWilliams,
1998, 2003, 2004). ROMS contains representations for the the following
additional elements:
- Surface fluxes of momentum, heat, water, and materials
with the atmosphere, including active coupling to an atmospheric model.
- K-Profile Parameterization (Large, McWilliams, and Doney,
1994) for top and bottom boundary layers plus interior diapycnal mixing
based on Richardson-number threshold.
- Open-boundary conditions for radiation, large-scale circulation,
and tides (Marchesiello, McWilliams, and Shchepetkin, 2001).
- 1-way and 2-way coupled, sigma-level grid embedding for
high-resolution subdomains (Penven et al, 2004).
- Multi-decadal Pacific basin simulations at coarse and
eddy-permitting resolutions --> boundary conditions for regional and local
coastal domains.
- A single-group plankton ecosystem (representing diatoms
in an upwelling regime) plus OCMIP-style carbon and oxygen cycles (Gruber
et al., 2004), or alternatively, a recently implemented multi-group, multi-nutrient
biogeochemical module (Moore et al., 2002).
- Pollution dispersal and mixing (Orem et al, 2004.
- Lagrangian tracking, online and offline, including behavioral
movement (Capet et al, 2004b).
- A data-assimilation and forecast system, plus an adjoint
model (with JPL).
- Particulate modeling: settling, coagulation, sediment
deposition, resuspension, transport, bed structure, detrital remineralization
(Blaas et al., 2004a,b).
- Surface wave effects on currents and tracers: combined
wave-current bottom shear stress parameterization, including prediction
of ripples and enhanced roughness related to waves and bed composition (Blaas
et al., 2004a) plus Stokes vortex force, Bernoulli head, sea-level set-up,
and Stokes advection (McWilliams, Restrepo, and Lane, 2004) .
ROMS Scientists
The roster of scientists at UCLA currently working with ROMS is
In addition, there are active collaborations with scientists at JPL, Penven at IRD
, Marchesiello at IRD,
WHOI,
Rutgers,
MBARI,
and SIO (DiLorenzo).
UCLA ROMS group photo in 2002.
Back row: Xavier Capet, Alexander Shchepetkin, Hartmut Frenzel, Keith Stolzenbach,
and John Oram.
Front row: Patrick Marchesiello, Jim McWilliams, and Nicolas Gruber.
Selected References
Blaas, M., P. Marchesiello, J.C. McWilliams, K.D. Stolzenbach, and C. Dong,
2004a: Sediment transport modeling on Southern Californian shelves. I: Model
description and sensitivity studies. In preparation.
Blaas, M., C. Dong, J.C. McWilliams, and K.D. Stolzenbach, 2004b: Sediment
transport modeling on Southern Californian shelves. II: Case studies. In
preparation.
Capet, X.J., P. Marchesiello, and J.C. McWilliams, 2004a: Upwelling response
to coastal wind profiles. Geophys. Research Lett., in press.
Capet, X., and J.C. McWilliams, 2004b: Lagrangian diagnostics of the cross-shore
exchanges off central California: A numerical approach using ROMS.
In preparation.
Capet, X., P. Penven, P. Marchesiello, and J.C. J. McWilliams, 2004c: Model/data
comparison of the dynamics and upwelling structure off central California.
In preparation.
H. Frenzel, N. Gruber, J.C. McWilliams, X. Capet, and P. Marchesiello ([maybe
add Charles and Meinte?]), 2004: Modeling of an upwelling event and its
effects on biogeochemical cycles in Santa Monica Bay, California. In preparation.
Gruber, N., H. Frenzel, S.C. Doney, P. Marchesiello, J. C. McWilliams,
J. R. Moisan, J. Oram, G.-K. Plattner, and K.D. Stolzenbach, 2004a: Simulation
of phytoplankton ecosystem dynamics in the California Current System. Deep-Sea
Research, submitted.
Gruber, N., H. Frenzel, W. Hamner, P. Marchesiello, J.C. McWilliams, N.
P. Nezlin, J. Oram, and K. Stolzenbach, 2004b: Biological-physical coupling
during an upwelling event in Santa Monica Bay, CA, in preparation.
Large, W.G., J.C. McWilliams, and S.C. Doney, 1994: Oceanic vertical mixing:
a review and a model with a non-local K-profile boundary layer parameterization.
Rev. Geophys. 32, 363-403.
Li, Z., Y. Chao, and J.C. McWilliams, 2004: A three-dimensional
variational data assimilation scheme for the Regional Ocean Modeling
System: I, Theoretical Formulation. In preparation.
Li, Z., Y. Chao, J. Choi, and J.C. McWilliams, 2004: A three-dimensional variational
data assimilation system for the Regional Ocean Modeling System: II, Implementation
and Real-Time Demonstration. In preparation.
Marchesiello, P., J.C. McWilliams, and A. Shchepetkin, 2001: Open boundary
conditions for long-term integration of regional ocean models. Ocean Modelling
3, 1-20. PDF format
Marchesiello, P., J.C. McWilliams, and A. Shchepetkin, 2003: Equilibrium
structure and dynamics of the California Current System. J. Phys. Ocean.
33, 753-783.
McWilliams, J.C., J.M. Restrepo, and E.M. Lane, 2004: An asymptotic theory
for the interaction of waves and currents in coastal waters. J. Fluid Mech.,
in press.
Moore, J.K., S.C. Doney, J.A. Kleypas, D.M. Glover, I. Y. Fung, 2002: An
intermediate complexity marine ecosystem model for the global domain.
Deep-Sea Research II 49, 403-462.
Oram, J., K. Stolzenbach, K, X. Capet, P. Marchesiello, and J.C. McWiiliams,
2004: Application of the Regional Ocean Modeling System to estimate the
residence times of Santa Monica Bay, CA and their dependence on the larger
scale circulation patterns of the Southern California Bight. In preparation.
Penven P., L. Debreu, P. Marchesiello, and J.C. McWilliams, 2003: Application
of the ROMS embedding procedure in the California Current Upwelling System.
Ocean Modelling, submitted.
Plattner, K., N. Gruber, S.C. Doney, H. Frenzel, and
J.C. McWilliams, 1994: Simulation of the carbon cycle in the California Current
System. In preparation.
Shchepetkin, A., and J.C. McWilliams, 1998: Quasi-monotone advection schemes
based on explicit locally adaptive dissipation. Monthly Weather Review
126, 1541-1580.
Shchepetkin, A.F., and J.C. McWilliams, 2003: A method for computing horizontal
pressure-gradient force in an ocean model with a non-aligned vertical coordinate.
J. Geophys. Res. 108, 35.1-35.34. PDF format
Shchepetkin, A.F., and J.C. McWilliams, 2004: The Regional Oceanic Modeling
System: A split-explicit, free-surface, topography-following-coordinate
ocean model. Ocean Modelling, in press.
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