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US East Coast ROMS/TOMS ProjectsUS East Coast ROMS/TOMS Projects
North Atlantic Basin (NATL) North Atlantic Basin (NATL) Northeast North American shelf (NENA)Northeast North American shelf (NENA)
NSF CoOP Buoyancy driven flow (LaTTE)NSF CoOP Buoyancy driven flow (LaTTE)CBLAST-LowCBLAST-Low
Northeast Observing System (NEOS)Northeast Observing System (NEOS)
John WilkinJohn Wilkin H. Arango, K. Fennel, L. Lanerolle, J. LevinH. Arango, K. Fennel, L. Lanerolle, J. Levin
Institute of Marine and Coastal SciencesInstitute of Marine and Coastal SciencesRutgers University Rutgers University
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Nested Interdisciplinary Modeling along the U.S. East Coast
John Wilkin (http://marine.rutgers.edu/~wilkin)
Katja Fennel
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NEOSNEOS
• Assimilate regional Assimilate regional CODAR with 4D-VarCODAR with 4D-Var
•Use tangent linear and Use tangent linear and adjoint to develop AUV adjoint to develop AUV deployment stategiesdeployment stategies
• Apply multiple-scale Apply multiple-scale nesting in support of nesting in support of subregion studies subregion studies (LaTTE, CBLAST …)(LaTTE, CBLAST …)
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• Precise observations of air-sea fluxes and turbulent mixing from Precise observations of air-sea fluxes and turbulent mixing from CBLAST are ideal for evaluating the suite of ocean model vertical CBLAST are ideal for evaluating the suite of ocean model vertical turbulence closure schemes implemented in ROMS.turbulence closure schemes implemented in ROMS.
• This comparison will be possible provided the model captures the This comparison will be possible provided the model captures the essential features of the ocean heat budget on diurnal to several essential features of the ocean heat budget on diurnal to several day time-scales, and spatial scales of order 1 km.day time-scales, and spatial scales of order 1 km.
• Modeling complements the interpretation of the field observations Modeling complements the interpretation of the field observations by quantifying unobserved lateral transport and mixing of heat.by quantifying unobserved lateral transport and mixing of heat.
CBLAST: CBLAST: Coupled Boundary Layers and Air-Sea TransferCoupled Boundary Layers and Air-Sea Transfer
The ONR CBLAST-Low program focuses on air-sea interaction and The ONR CBLAST-Low program focuses on air-sea interaction and coupled atmosphere/ocean boundary layer dynamics at low wind coupled atmosphere/ocean boundary layer dynamics at low wind
speeds where processes are strongly modulated by thermal forcing.speeds where processes are strongly modulated by thermal forcing.
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MVCOMVCO
Nantucket SODARNantucket SODARK
ASITASIT
ASIMET moorings with ASIMET moorings with ocean T(z) and ADCPocean T(z) and ADCP
RemoteRemoteSensingSensing
AircraftAircraft
3-D3-DMoorinMoorin
gg
CBLAST-Low Observing System:CBLAST-Low Observing System:
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Lagrangian Transport and Lagrangian Transport and Transformation Experiment (LaTTE)Transformation Experiment (LaTTE)
• Dye release in Hudson River plumeDye release in Hudson River plume
• 4D-var assimilation with ROMS4D-var assimilation with ROMS
• Coupled bio-optical modeling with EcoSimCoupled bio-optical modeling with EcoSim
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North Atlantic Simulation.North Atlantic Simulation.• Resolution: 1/10 deg. Grid is 1000x1000x30;• Disk space for input datasets: 15.7 Gb Monthly climatology (12 records 250 Mb each) Wind forcing (7 years of daily records 4.8 Mb each) Surface fluxes (12 records 32 Mb each)• Disk space for model output: 280 Gb 3 day averages for 7 years (854 records 325 Mb each)• Simulation runs on 32 processors of SGI Origin 3000 Total memory 11 Gb One day of simulation take 46 CPU hours Wall clock time to run 7 years of simulation: 153 days.
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14 months of simulation, starting Jan 199314 months of simulation, starting Jan 1993Temperature at 100 m depth.Temperature at 100 m depth.
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• Though the MAB shelf is somewhat isolated from remote forcing, Though the MAB shelf is somewhat isolated from remote forcing, the salinity of the Scotian Shelf inflow plays a significant role in the salinity of the Scotian Shelf inflow plays a significant role in interannual variability of the MAB and preconditions water masses interannual variability of the MAB and preconditions water masses and stratification inshore from the shelf-slope front. and stratification inshore from the shelf-slope front.
• Present NENA solutions have a weak, or reversed, Maine Coastal Present NENA solutions have a weak, or reversed, Maine Coastal Current because of inadequate salinity open boundary conditions on Current because of inadequate salinity open boundary conditions on the Scotian Shelf.the Scotian Shelf.
• Accordingly, we wish to move beyond nesting within a Accordingly, we wish to move beyond nesting within a climatologically forced model to 1-way nesting of NENA within the climatologically forced model to 1-way nesting of NENA within the HYCOM data assimilating North Atlantic model. This development will HYCOM data assimilating North Atlantic model. This development will apply inter-annual variability to the a priori inflow open boundary apply inter-annual variability to the a priori inflow open boundary conditions of the NENA/NEOS models. conditions of the NENA/NEOS models.
• Gulf Stream variability at Cape Hatteras influences the exchange of Gulf Stream variability at Cape Hatteras influences the exchange of shelf and slope waters at the terminus of the southwestward MAB shelf and slope waters at the terminus of the southwestward MAB coastal current, so the open boundary model coastal current, so the open boundary model mustmust achieve a realistic achieve a realistic GS separationGS separation
• We are also developing 1-way nesting of NENA within the We are also developing 1-way nesting of NENA within the approximately 7-km resolution European Mercator North Atlantic approximately 7-km resolution European Mercator North Atlantic operational 14-day forecast system.operational 14-day forecast system.
Need open boundary conditions from an Need open boundary conditions from an assimilative North Atlantic modelassimilative North Atlantic model
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• Hierarchy of modeling studies from basin to coastal using Hierarchy of modeling studies from basin to coastal using ROMS/TOMS tools ROMS/TOMS tools
• Processes: COProcesses: CO22 cycling, buoyancy-driven flow, wind-driven cycling, buoyancy-driven flow, wind-driven
upwelling, air-sea interaction, coastal bio-optics and sediment upwelling, air-sea interaction, coastal bio-optics and sediment transport transport
• Integrated observational/modeling studiesIntegrated observational/modeling studies
• CBLAST: air-sea interaction, waves, mixingCBLAST: air-sea interaction, waves, mixing
• LaTTE: intensive observing systemsLaTTE: intensive observing systems
• NEOS: prototype modern, relocatable, observing networkNEOS: prototype modern, relocatable, observing network
• Adjoint, tangent linear codes feature in most projectsAdjoint, tangent linear codes feature in most projects
• Developing coastal prediction systemsDeveloping coastal prediction systems
• using new observing system capabilities, adaptive sampling using new observing system capabilities, adaptive sampling design, 4D-Vardesign, 4D-Var
SummarySummary
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• Gulf of Maine: Surface Gulf of Maine: Surface inflow of relatively fresh inflow of relatively fresh water from the Scotian water from the Scotian Shelf and onshore flow of Shelf and onshore flow of dense slope water at depth dense slope water at depth via deep channels produce via deep channels produce an estuarine-like an estuarine-like circulation. This fosters circulation. This fosters shelf/deep-ocean exchange shelf/deep-ocean exchange strongly steered by strongly steered by bathymetry. bathymetry.
U.S. East Coast oceanography and open U.S. East Coast oceanography and open boundary conditionsboundary conditions
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• Mid-Atlantic Bight: GoM waters exit around Cape Cod and feed a Mid-Atlantic Bight: GoM waters exit around Cape Cod and feed a southwestward mean flow on the broad (100-200 km) and shallow (100-southwestward mean flow on the broad (100-200 km) and shallow (100-200 m) MAB shelf. The shelf-slope front separates fresh/cool shelf waters 200 m) MAB shelf. The shelf-slope front separates fresh/cool shelf waters from saltier/warmer slope water, isolating the shelf from deep ocean from saltier/warmer slope water, isolating the shelf from deep ocean influences and admitting a greater forcing role for riverine buoyancy influences and admitting a greater forcing role for riverine buoyancy input than is typical of, e.g., the US West Coast shelf. input than is typical of, e.g., the US West Coast shelf.
• Water mass properties and drifter trajectories in the MAB reveal Water mass properties and drifter trajectories in the MAB reveal increasing exchange of shelf waters with the adjacent deep ocean as the increasing exchange of shelf waters with the adjacent deep ocean as the southwestward mean flow approaches Cape Hatteras.southwestward mean flow approaches Cape Hatteras.
