dale haidvogel [email protected] nested modeling studies on the northeast u.s. continental...

dale haidvogel [email protected]

Nested Modeling Studies on the Northeast Nested Modeling Studies on the Northeast U.S. Continental ShelvesU.S. Continental Shelves

Dale B. Haidvogel

John Wilkin, Katja Fennel, Hernan Arango, Paul Goodman

Institute of Marine and Coastal Sciences

Rutgers University

With support from NSF, ONR, NASA, NOPP, USGS


Outline

• Regional circulation and science issues

• Computational approaches

• Regional Ocean Modeling System (ROMS)

• Nested applications:

• NATL (North Atlantic Basin)• NENA (North Eastern North Atlantic)• NEOS (North Eastern Observatory System)

• LATTE (LAgrangian Transport and Transformation Experiment)

• Where do we go next?


Under development for ROMS

•Wetting and drying capabilities•Sediment submodel•Sea ice dynamics •Framework (ESMF)•Web-based dynamic documentation•Web-based test problem suite•Coupling with WRF atmospheric

model

http://marine.rutgers.edu/po/models/roms/index.php


• Sensitivity analysis

• Singular vectors (optimal perturbations)

• Pseudospectra

• Eigenmodes and adjoint eigenmodes

• Forcing singular vectors

• Stochastic optimals

• Parameter estimation

• Ensemble prediction

• Variational data assimilation (e.g., 4DVAR)

Tangent Linear and Adjoint Models


• Coastal upwelling and associated in-water optical properties (NY/NJ Bight, NENA)

• Seasonal and interannual variability in ocean carbon flux, transport, and burial (NENA)

• Air-sea heat and momentum transfer and boundary layer dynamics (CBLAST)

• Transport of nutrients and contaminants in the Hudson River plume (LATTE)

• Prediction and state estimation (NEOS)

Nested Applications on the NE Shelves


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6

5

4

Nested Grids in the Northwest AtlanticNested Grids in the Northwest Atlantic

1) NENA1) NENA2) NEOS2) NEOS3) CBLAST3) CBLAST4) LATTE4) LATTE5) NY/NJ Bight5) NY/NJ Bight6) Caribbean6) Caribbean


North Atlantic Basin Simulation (NATL)North Atlantic Basin Simulation (NATL)

• 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.


Temperature at 100 m depthTemperature at 100 m depth


US East Coast (NENA)

• 10 km resolution (192x64x30)• Initialized for North Atlantic Basin Simulation• NCEP daily winds• COADS monthly heat fluxes with imposed daily

shortwave radiation cycle.• One-way nesting

• Boundary conditions from 3-day averages• Flather/Chapman OBC for 2D momentum• Clamped OBC for 3D momentum and tracers

• Rivers• Fasham-type biology model


No 3 NH4

Phyto -p la nkton

C hlo

Zoo -p la nkton

De trita l N (sm a ll)

De trita l N (la rg e )

Nitrific a tio n

M ine ra liza tio n

Up ta ke

Exc re tio n

Sinking

G ra zing

M o rta lity


No 3 NH4

Phyto -p la nkton

C hlo

Zoo -p la nkton

De trita l N (sm a ll)


Nitrific a tio n


Up ta ke

Exc re tio n

Sinking

G ra zing

M o rta lity

Se d im e nt

N 2 NH4 No 3

De tritus (lg )

De tritus (sm )

O xic M ine ra liza tio nDe nitrific a tio n

Lo ss o ffixe d N


No 3 NH4

Phyto -p la nkton

C hlo

Zoo -p la nkton

Detrita l N (sm a ll)


Nitrific a tio n


Up ta ke

Exc re tio n

Sinking

G ra zing

M o rta lity

Alka linity

C a rb ona te system

TIC

C o g a s e xc ha ng e

2

Detrita l C (sm

Detrita l C (lg )

Se d im ent

N2 NH4 No 3

De tritus (lg )

De tritus (sm )

O xic M ine ra liza tio nDe nitrific a tio n

Lo ss o ffixe d N


Northeast North Atlantic (NENA) embedded within NATLNortheast North Atlantic (NENA) embedded within NATL

3-day average open boundary values from NATL3-day average open boundary values from NATL7-component NPZD ecosystem7-component NPZD ecosystem

TemperaturTemperaturee

ChlorophyllChlorophyll


Comparison of Modeled and Observed Chlorophyll


CO

2 fl

ux (

mol m

-2 y

r-1)

Day of year

Air-sea CO2-flux:

-simulated (top, right)

-observed (bottom, right; Boehme et al., Mar. Chem. 1998)


Observational estimates of mean annual shelf primary production:

•LEO15: 715 gC m-2 y-1 (MacDonald 1983)

•NY Bight: 290 gC m-2 y-1 (Malone et al. 1983)

•G.o.Maine to Cape Hatteras: 310 gC m-2 y-1

(O’Reilly and Busch 1984)

•Southern MAB: 620 gC m-2 y-1 (Lohrenz et al. 2002)


Temperatureat 100 m

(One-month after initialization)

NENA

NATL

NENA / NATL COUPLING


SurfaceSalinity

(Initialization01-Jan-1993)

NEOS

NENA

NEOS / NENA COUPLING


• In regional applications, one-way nesting works very well

• Specification of appropriate barotropic fields at the open boundaries is essential for stable computations

• Open source community models produce better algorithms over a wide range applications:

•Promote collaborative development and testing

•Promote higher standards

•Complete information transfer; wider usage

Technical Remarks

http://www.ocean-modeling.org/


Future Developments

• Coast-wide observing network for NEOS

• Embed within operational North Atlantic model

• Move to block/unstructured grids


Northeast Observing System (NEOS)Northeast Observing System (NEOS)


HyCOM GODAE ProjectHyCOM GODAE Project

http://hycom.rsmas.miami.edu/internal/seven/Overview-NOPP-GODAE.pdf

dale haidvogel [email protected] nested modeling studies on the northeast u.s. continental...

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