A5009795502- Oceanographic and Atmospheric Processes
- Meteorological Phenomena and Simulations
- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Geophysics and Gravity Measurements
- Distributed and Parallel Computing Systems
- Arctic and Antarctic ice dynamics
- Reservoir Engineering and Simulation Methods
- Model Reduction and Neural Networks
- Ocean Waves and Remote Sensing
- Hydrocarbon exploration and reservoir analysis
- Wind and Air Flow Studies
- Advanced Data Storage Technologies
- Tropical and Extratropical Cyclones Research
- Underwater Acoustics Research
- Cloud Computing and Resource Management
- Nuclear Physics and Applications
- Numerical methods for differential equations
- Ocean Acidification Effects and Responses
- Scientific Computing and Data Management
- Heat Transfer and Optimization
- Hydrological Forecasting Using AI
- Atmospheric Ozone and Climate
Massachusetts Institute of Technology
2013-2025
Ansys (United States)
2011-2023
Planetary Science Institute
1996-2022
Imperial College London
2022
Moscow Institute of Thermal Technology
2020
The Graduate Center, CUNY
2020
Columbia University
2020
IIT@MIT
2011-2016
Mentor Technologies
2006
Siemens (Hungary)
2006
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. This paper presents the ECCO v4 non-linear inverse modeling framework and its baseline solution for evolving ocean state over period 1992–2011. Both components are publicly available subjected to regular, automated regression tests. The includes sets of global conformal grids, a model setup, implementations data constraints control parameters, an interface algorithmic differentiation, as well grid-independent, fully capable Matlab toolbox. is dynamically consistent estimate without...
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...
The Earth System Modeling Framework (ESMF) project is developing a standard software platform for system models. standard, which defines component architecture and support infrastructure, being developed under open-software practices. Target applications range from operational numerical weather prediction to climate-system change predictability studies.
A promising approach to improve climate-model simulations is replace traditional subgrid parameterizations based on simplified physical models by machine learning algorithms that are data-driven. However, neural networks (NNs) often lead instabilities and climate drift when coupled an atmospheric model. Here we learn NN parameterization from a high-resolution simulation in idealized domain coarse graining the model equations output. The has structure ensures constraints respected, it leads...
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...
We first describe the principles and practical considerations behind computer generation of adjoint to Massachusetts Institute Technology ocean general circulation model (GCM) using R. Giering's software tool Tangent‐Linear Adjoint Model Compiler (TAMC). The TAMC's recipe for (FORTRAN‐) line‐by‐line code is explained by interpreting an strictly as operator that gives sensitivity output a its input. Then, 1993 annual mean heat transport across 29°N in Atlantic, hydrography on January 1, 1993,...
Abstract An observational, modeling, and theoretical study of the scales, growth rates, spectral fluxes baroclinic instability in ocean is presented, permitting a discussion relation between local scale; first deformation scale Rdef; equilibrated, observed eddy scale. The geography large-scale, meridional quasigeostrophic potential vorticity (QGPV) gradient mapped out using climatological atlas, attention drawn to asymmetries midlatitude eastward currents subtropical return flows, latter...
Abstract Near-surface “effective diffusivities” associated with geostrophic eddies in the Southern Ocean are estimated by numerically monitoring lengthening of idealized tracer contours as they strained surface flow observed satellite altimetry. The resulting diffusivities show considerable spatial variability and large (2000 m2 s−1) on equatorward flank Antarctic Circumpolar Current small (500 at jet axis. Regions high low effective diffusivity shown to be collocated regions of,...
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...
The Earth System Modeling Framework is a component-based architecture for developing and assembling climate related models. A virtual machine underlies the component-level constructs in ESMF, providing both foundation performance portability mechanisms resource allocation component sequencing.
Abstract Quantifying variability in the ocean carbon sink remains problematic due to sparse observations and spatiotemporal surface p CO 2 . To address this challenge, we have updated improved ECCO‐Darwin, a global biogeochemistry model that assimilates both physical biogeochemical observations. The consists of an adjoint‐based circulation estimate from Estimating Circulation Climate Ocean (ECCO) consortium ecosystem developed by Massachusetts Institute Technology Darwin Project. In addition...
Oceananigans.jl is a fast and friendly software package for the numerical simulation of incompressible, stratified, rotating fluid flows on CPUs GPUs.Oceananigans.jl flexible enough research yet simple students first-time programmers.Oceananigans.jl being developed as part Climate Modeling Alliance project small-scale ocean physics at high-resolution that affect evolution Earth's climate.Oceananigans.jl designed simulations in idealized geometries supports direct simulation, large eddy...
The inventory and variability of oceanic dissolved inorganic carbon (DIC) is driven by the interplay physical, chemical, biological processes. Quantifying spatiotemporal these drivers crucial for a mechanistic understanding ocean sink its future trajectory. Here, we use Estimating Circulation Climate Ocean-Darwin biogeochemistry state estimate to generate global-ocean, data-constrained DIC budget investigate how spatial seasonal-to-interannual in three-dimensional circulation, air-sea CO2...
Estimates of ocean circulation constrained by in situ and remotely sensed observations have become routinely available during the past five years, they are being applied to myriad scientific operational problems [ Stammer et al ., 2002]. Under Global Ocean Data Assimilation Experiment (GODAE), several regional global estimates evolved for applications climate research, seasonal forecasting, naval operations, marine safety, fisheries, offshore oil industry coastal management, other areas....
The Open/ADF tool allows the evaluation of derivatives functions defined by a Fortran program. derivative is performed code resulting from analysis and transformation original program that defines function interest. has been designed with particular emphasis on modularity, flexibility, use open source components. While follows basic principles automatic differentiation, implements new algorithmic approaches at various levels, for example, block preaccumulation call graph reversal. Unlike...
This paper examines the potential of regional environmental prediction by focusing on local forecasting effort in Pacific Northwest. A consortium federal, state, and agencies have funded development operation a multifaceted numerical system centered at University Washington that includes atmospheric, hydrologic, air quality models, collection real-time weather data sources, number applications using both observations model output. The manuscript reviews northwest modeling systems, describes...
The spatial distribution and fate of riverine dissolved organic carbon (DOC) in the Arctic may be significant for regional cycle but are difficult to fully characterize using sparse observations alone. Numerical models circulation biogeochemical cycles region can help interpret extrapolate data ultimately applied global change sensitivity studies. Here we develop explore a regional, three‐dimensional model Ocean which, first time, explicitly represent sources DOC with seasonal discharge...