A5007347487- Oceanographic and Atmospheric Processes
- Climate variability and models
- Meteorological Phenomena and Simulations
- Arctic and Antarctic ice dynamics
- Atmospheric and Environmental Gas Dynamics
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Ocean Waves and Remote Sensing
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Calibration and Measurement Techniques
- Climate change and permafrost
- Tropical and Extratropical Cyclones Research
- Geological formations and processes
- Reservoir Engineering and Simulation Methods
- Fluid Dynamics and Turbulent Flows
- Ionosphere and magnetosphere dynamics
- Ocean Acidification Effects and Responses
- Geological Studies and Exploration
- Coastal and Marine Dynamics
- Geological Modeling and Analysis
- Energy Load and Power Forecasting
- Underwater Acoustics Research
- Landslides and related hazards
Princeton University
2016-2025
NOAA Geophysical Fluid Dynamics Laboratory
2015-2024
National Oceanic and Atmospheric Administration
2012-2023
NSF NCAR Climate and Global Dynamics Laboratory
2022
NSF National Center for Atmospheric Research
2022
Massachusetts Institute of Technology
1997-2004
Planetary Science Institute
1999-2002
Moscow Institute of Thermal Technology
2001
The numerical implementation of an ocean model based on the incompressible Navier Stokes equations which is designed for studies circulation horizontal scales less than depth right up to global scale described. A “pressure correction” method used solved as a Poisson equation pressure field with Neumann boundary conditions in geometry complicated that basins. major objective study make this inversion, and hence nonhydrostatic modeling, efficient parallel computers. separated into surface,...
Ocean models based on consistent hydrostatic, quasi‐hydrostatic, and nonhydrostatic equation sets are formulated discussed. The quasi‐hydrostatic more accurate than the widely used hydrostatic primitive equations. Quasi‐hydrostatic relax precise balance between gravity pressure gradient forces by including in a manner cosine‐of‐latitude Coriolis terms which neglected models. Nonhydrostatic employ full incompressible Navier Stokes equations; they required study of small‐scale phenomena ocean...
Abstract The physical climate formulation and simulation characteristics of two new global coupled carbon–climate Earth System Models, ESM2M ESM2G, are described. These models demonstrate similar fidelity as the Geophysical Fluid Dynamics Laboratory’s previous Climate Model version 2.1 (CM2.1) while incorporating explicit consistent carbon dynamics. differ exclusively in ocean component; uses Modular Ocean 4p1 with vertical pressure layers ESM2G Generalized Layer a bulk mixed layer interior...
Abstract We describe the baseline coupled model configuration and simulation characteristics of GFDL's Earth System Model Version 4.1 (ESM4.1), which builds on component developments at GFDL over 2013–2018 for carbon‐chemistry‐climate contributing to sixth phase Coupled Intercomparison Project. In contrast with CM4.0 development effort that focuses ocean resolution physical climate, ESM4.1 comprehensiveness system interactions. features doubled horizontal both atmosphere (2° 1°) (1° 0.5°)...
Abstract The authors describe carbon system formulation and simulation characteristics of two new global coupled carbon–climate Earth System Models (ESM), ESM2M ESM2G. These models demonstrate good climate fidelity as described in part I this study while incorporating explicit consistent dynamics. differ almost exclusively the physical ocean component; uses Modular Ocean Model version 4.1 with vertical pressure layers, whereas ESM2G generalized layer dynamics a bulk mixed interior isopycnal...
Height coordinate ocean models commonly represent topography as a “staircase” of discontinuous steps that are fitted to the model grid. Here ramifications an alternative approach studied in which “shaved cells” used irregular topography. The problem is formulated using finite-volume method and care taken ensure discrete forms have appropriate conservation properties. Two representations topography, “partial step” “piecewise linear,” considered compared with staircase some standard problems...
Abstract The authors present results for simulated climate and change from a newly developed high-resolution global model [Geophysical Fluid Dynamics Laboratory Climate Model version 2.5 (GFDL CM2.5)]. GFDL CM2.5 has an atmospheric resolution of approximately 50 km in the horizontal, with 32 vertical levels. horizontal ocean ranges 28 tropics to 8 at high latitudes, This allows explicit simulation some mesoscale eddies ocean, particularly lower latitudes. Analyses are presented based on...
We describe the Geophysical Fluid Dynamics Laboratory's CM4.0 physical climate model, with emphasis on those aspects that may be of particular importance to users this model and its simulations. The is built AM4.0/LM4.0 atmosphere/land OM4.0 ocean model. Topics include rationale for key choices made in formulation, stability as well drift preindustrial control simulation, comparison historical simulations observations from recent decades. Notable achievements relatively small biases seasonal...
Abstract. The Ocean Model Intercomparison Project (OMIP) is an endorsed project in the Coupled Phase 6 (CMIP6). OMIP addresses CMIP6 science questions, investigating origins and consequences of systematic model biases. It does so by providing a framework for evaluating (including assessment biases), understanding, improving ocean, sea-ice, tracer, biogeochemical components climate earth system models contributing to CMIP6. Among WCRP Grand Challenges (GCs), primarily contributes regional sea...
Abstract We document the configuration and emergent simulation features from Geophysical Fluid Dynamics Laboratory (GFDL) OM4.0 ocean/sea ice model. OM4 serves as component for GFDL climate Earth system models. It is also used science research contributing to Coupled Model Intercomparison Project version 6 Ocean Project. The ocean of uses Modular sea 2 Sea Ice Simulator, which have identical horizontal grid layouts (Arakawa C‐grid). follow Coordinated Ocean‐sea Reference Experiments protocol...
We revisit the challenges and prospects for ocean circulation models following Griffies et al. (2010). Over past decade, evolved through improved understanding, numerics, spatial discretization, grid configurations, parameterizations, data assimilation, environmental monitoring, process-level observations modeling. Important large scale applications over last decade are simulations of Southern Ocean, Meridional Overturning Circulation its variability, regional sea level change. Submesoscale...
Abstract We document the development and simulation characteristics of next generation modeling system for seasonal to decadal prediction projection at Geophysical Fluid Dynamics Laboratory (GFDL). SPEAR ( S eamless System P rediction EA rth R esearch) is built from component models recently developed GFDL—the AM4 atmosphere model, MOM6 ocean code, LM4 land SIS2 sea ice model. The are specifically designed with attributes needed a model time scales, including ability run large ensembles...
Abstract. We present a new framework for global ocean–sea-ice model simulations based on phase 2 of the Ocean Model Intercomparison Project (OMIP-2), making use surface dataset Japanese 55-year atmospheric reanalysis driving models (JRA55-do). motivate OMIP-2 over first OMIP (OMIP-1), previously referred to as Coordinated Ocean–ice Reference Experiments (COREs), via evaluation OMIP-1 and from 11 state-of-the-science models. In evaluation, multi-model ensemble means spreads are calculated...
A three‐dimensional oceanic state is estimated for the period 1992–1997 as it results from combining large‐scale ocean data sets with a general circulation model. At cost of increased computational load, estimation (assimilation) method chosen specifically so that resulting estimate consistent model equations, having no artificial sources or sinks. To bring into close agreement observations, its initial temperature and salinity conditions are permitted to change, time‐dependent surface...
A hydrodynamical kernel that drives both an atmospheric and oceanic general circulation model is implemented in orthogonal curvilinear coordinates using the finite-volume method on sphere. The naturally describes arbitrary grids, use of vector-invariant form momentum equations simplifies generalization to coordinates. Grids based expanded spherical cube Rancic et al., which contain eight singular points, are used. At these singularities grid nonorthogonal. combined shown avoid degeneracy at...
An analysis of ocean volume, heat, and freshwater transports from a fully constrained general circulation model (GCM) is described. Output data synthesis, or state estimation, method used by which the was forced to large‐scale, time‐varying global sets over 1993 through 2000. Time‐mean horizontal transports, estimated this time‐dependent circulation, have converged with independent time‐independent estimates box inversions most parts world but especially in southern hemisphere. However, heat...
Internal wave reflection from a sloping topographic boundary may lead to enhanced shear if the angle horizontal is close that of internal group velocity vector. Previous analytic studies have suggested enhancement reduced at concave slopes as compared with convex and planar near critical angle. Here pass through investigated numerically using nonhydrostatic Massachusetts Institute Technology General Circulation Model (MITgcm). Overturning, instability, resultant mixing are examined. Results...
Abstract A subgrid‐scale eddy parameterization is developed, which makes use of an explicit kinetic energy budget and can be applied at both “non‐eddying” “eddy‐permitting” resolutions. The eddies exchange with the resolved flow in directions via a baroclinic instability (based on established formulation Gent McWilliams) biharmonic negative Laplacian viscosity terms. This represents turbulent cascades enstrophy consistent our current understanding cycle. At same time, approach simple general...
Abstract Six recent Langmuir turbulence parameterization schemes and five traditional are implemented in a common single‐column modeling framework consistently compared. These tested scenarios versus matched large eddy simulations, across the globe with realistic forcing (JRA55‐do, WAVEWATCH‐III simulated waves) initial conditions (Argo), under as observed at ocean moorings. Traditional non‐Langmuir systematically underpredict simulation vertical mixing weak convective forcing, while vary...
We evaluate the Community ocean Vertical Mixing (CVMix) project version of K-profile parameterization (KPP). For this purpose, one-dimensional KPP simulations are compared across a suite oceanographically relevant regimes against large eddy (LES). The LES is forced with horizontally uniform boundary fluxes and has initial conditions, allowing its horizontal average to be tests. find standard configuration consistent many forcing regimes, supporting physical basis KPP. Our evaluation...
Abstract Efforts to manage living marine resources (LMRs) under climate change need projections of future ocean conditions, yet most global models (GCMs) poorly represent critical coastal habitats. GCM utility for LMR applications will increase with higher spatial resolution but obstacles including computational and data storage costs, obstinate regional biases, formulations prioritizing robustness over skill persist. Downscaling can help address limitations, significant improvements are...