US West Coast Modeling: Coupled Bio-Physical HYCOM ‘nested ‘

within Pacific HYCOM

John Kindle Igor Shulman, Sergio deRada, Brad Penta

Coupled Processes Section

Oceanography Division

Naval Research Laboratory

HYCOM West Coast Modeling

• Utilize Boundary values from Pacific Basin HYCOM Run ( Metzger)

• Focus on period 1999-2002 +– Parallels NRL effort with NCOM– Uses High Resolution COAMPS Reanalysis Forcing

• NRL Monterey/ Air-Sea Coupling project

• Leverage results from– NRL CoNESTS: West Coast HYCOM– PARADIGM NOPP: Ecosystem Model – NRL CoBIOPP: NCOM coupled physical-bio-optical– NRL Coupled Air-Sea in Coastal Zone: COAMPS– Collaborations( HYCOM modeling, Field Programs,++)

1/12° Pacific HYCOM Basin-scale Circulation SSH Snapshot – 21 March

Forced with high frequency climatological ECMWF winds and thermal forcing

WEST COAST HYOM

HYCOM

3-4 Km

Resolution

PhysicalModel

Nitrate[NO3]

Advection& Mixing

SmallPhytoplankton

[P1]NO3

Uptake

Micro-Zooplankton

[Z1]

Grazing

Ammonium[NH4]

Excretion

NH4

Uptake

Detritus-N[DN]

FecalPellet

Sinking

Silicate[Si(OH)4]

Diatoms[P2]

SiUptake

N-Uptake

Meso-Zooplankton

[Z2]

Sinking

Detritus-Si[DSi]

GrazingFecalPellet

Sinking

Predation

Lost

Total CO2

[TCO2]

BiologicalUptake

Air-Sea Exchange

Physical-Biogeochemical Model: Fei Chai

Global Navy Coastal Ocean Model (NCOM)

1/8th degree resolution; 40 levels( hyb)

Remotely forced signal : Originates in tropics; Requires accurate nesting between global and regional model to separate from local forcing.

Observed: Enfield and Allen (1980)

60 Day Smoothing

Remote versus Local Forcing

30N

Black: Observed

Global NCOM

Regional NCOM

CoBALT: Remote versus Local Forcing

Tide gauges used to help evaluate model response

Regional Model accurately represents remotely forced signal as provided by Global NCOM

Model Evaluation

Chlorophyll from SeaSoar

Survey

Aug. 8, 2001

COAST CoOP Program

Courtesy: Jack Barth

OSU

NCOM Coupled bio-physical model.

Model Chlorophyl Aug. 7-9, 200l

Forcing: COAMPS Model Stresses

Courtesy

Jack Barth

COAST CoOP Program

OSU

Local + Remote

Vertical Advection Problem: Silicate Gradient

Silicate

Temperature

Smoothed

Bathymetry

NRL Test Region: US West Coast: 1/120 West Coast Model nested within Global NCOM( 1/8th deg.) ( Regional Model; 1/24th deg by 9/03)

www7320.nrlssc.navy.mil/cobiopp

WEST COAST NCOM10-APR-2000