a regional hycom model for the us west coastus west coast hycom funded by – nrl 6.2 coastal ocean...
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A Regional HYCOM Model for the US A Regional HYCOM Model for the US West CoastWest Coast
John KindleJohn KindleSergio Sergio deRadadeRada, Josefina , Josefina OlascoagaOlascoaga
Brad Brad PentaPenta
Acknowledgments: Joe Metzger, Alan Acknowledgments: Joe Metzger, Alan WallcraftWallcraft, Harley , Harley HurlburtHurlburt, Pat Hogan, Pat HoganStephanie Anderson( Stephanie Anderson( CayulaCayula), Igor ), Igor ShulmanShulman
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US West Coast HYCOM US West Coast HYCOM
Funded byFunded by–– NRL 6.2 Coastal Ocean Nesting Studies NRL 6.2 Coastal Ocean Nesting Studies
((CoNESTSCoNESTS) Project ) Project ------w. Pat Hoganw. Pat HoganEvaluate HYCOM as a coastal ModelEvaluate HYCOM as a coastal ModelImplement Regional HYCOM for US west coast.Implement Regional HYCOM for US west coast.
–– NOPP PARADIGM Project: Partners for the NOPP PARADIGM Project: Partners for the Advancement of Interdisciplinary Global Advancement of Interdisciplinary Global Models Models ------with Eric with Eric ChassignetChassignet
Incorporate Biological Model into HYCOMIncorporate Biological Model into HYCOM
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1/12° Pacific HYCOM Basin-scale Circulation withnested US West Coast HYCOM
Forced with high frequency ECMWF winds and thermal forcingSSH Snapshot – 21 March
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1/12° Pacific HYCOM Basin-scale Circulation withnested US West Coast HYCOM
Pacific Basin HYCOM Nested US West Coast HYCOM
Nested HYCOM uses same resolution and forcing as Pacific HYCOM to test bc.
Simulation begins on January 1, 2001; no data assimilation is included.
ECMWF Forcing
ECMWF Forcing
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PhysicalModel
Nitrate[NO3]
Advection& Mixing
SmallPhytoplankton
[P1]NO3
Uptake
Micro-Zooplankton
[Z1]Grazing
Ammonium[NH4]
Excretion
NH4Uptake
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 et al.
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PhysicalModel
Nitrate[NO3]
Advection& Mixing
SmallPhytoplankton
[P1]
Micro-Zooplankton
[Z1]
Ammonium[NH4]
Excretion
Detritus-N[DN]
Sinking
Silicate[Si(OH)4]
Phytoplankton
N-Uptake
Zooplankton
Sinking
Detritus-Si[DSi]
Grazing
Predation
Consump.
Total CO2[TCO2]
BiologicalUptake
Air-Sea Exchange
Physical-Biogeochemical Model: NPZD ( Lima, Olson and Doney)
Mort.
Remin.
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Evaluation of Nested HYCOMEvaluation of Nested HYCOMModel SSH comparisons with observations from tide gauges ( atm. pressure corrected)
ECMWF Forcing
Pacific ModelRegional Model
Pacific ModelRegional Model
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Phytopl.:
NPZD
Coupled to HYCOM.
HYCOM
Ecosystem Model ResponseModel Phytoplankton NOGAPS Forced Experiment
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Pacific HYCOM/ Regional HYCOMPacific HYCOM/ Regional HYCOM
NOGAPS Forcing NOGAPS Forcing
Pacific Model Regional Model
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ECMWF vs. NOGAPS?ECMWF vs. NOGAPS?
ECMWF Forced
NOGAPS Forced
Pacific and Regional Simulations
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Pacific HYCOM: ECMWF vs. NOGAPSPacific HYCOM: ECMWF vs. NOGAPS
NOGAPS Forcing ECMWF Forcing
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Regional HYCOM: ECMWF vs. NOGAPSRegional HYCOM: ECMWF vs. NOGAPS
NOGAPS Forcing ECMWF Forcing
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Differences in Forcing for Pacific Differences in Forcing for Pacific ExperimentsExperiments
ECMWF case uses stresses formed from ECMWF case uses stresses formed from 10m winds10m windsNOGAPS case uses direct model stresses NOGAPS case uses direct model stresses offset by ECMWF meanoffset by ECMWF mean–– Hybrid wind setHybrid wind set–– NOGAPS mean replaced by ECMWF mean( NOGAPS mean replaced by ECMWF mean(
as determined above)as determined above)
Hypothesis: Responses explained by differences in wind stress curl patterns
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Wind Stress Curl DistributionsWind Stress Curl DistributionsMay 2001May 2001
ECMWF 10m winds NOGAPS 10m winds NOGAPS Direct stresses
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Dynamics of Coupled Models: COAMPSDynamics of Coupled Models: COAMPSFlux Coupler: Accounts for Large Land-Sea Gradients by interpolating fields from the native atmospheric grid using the atmospheric model land mask. Otherwise, ocean points are corrupted
Standard Interpolation: No land mask information
Flux Coupler Applied using land mask information
Operational COAMPS along West Coast of US
Ocean model response may be corrupted unless atmospheric forcing has been carefully interpolated to ocean model grid using native atmospheric fields and model land mask.
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Sensitivity to Wind forcingSensitivity to Wind forcing
ECMWF Stresses from 10m winds
NOGAPS L&P StressesNOGAPS Hybrid L&P StressesNOGAPS Direct StressesNOGAPS Hybrid Direct Stresses
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Sensitivity to Wind forcingSensitivity to Wind forcingNOGAPS L&P StressesNOGAPS Hybrid Stresses
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Sensitivity to Model VersionSensitivity to Model VersionHYCOM Version . 2.1.27+HYCOM Version . 2.1.09
Both Experiments have same forcing, same Boundary values
Forced by NOGAPS HYBRID Stesses
Forced by NOGAPS HYBRID Stesses
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Recommendations for Pacific Data Recommendations for Pacific Data Assimilative RunsAssimilative Runs
Use latest version of Model CodeUse latest version of Model CodeUse stresses based on NOGAPS 10m Use stresses based on NOGAPS 10m winds instead of direct stresseswinds instead of direct stresses–– Unless NOGAPS stresses become available Unless NOGAPS stresses become available
on native grid.on native grid.
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Sensitivity to Boundary ValuesSensitivity to Boundary Values
ECMWF Boundary Values(3.4)
NOGAPS Boundary Values (6.2)
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Sensitivity to Boundary ValuesSensitivity to Boundary ValuesECMWF ( 3.4) Boundary Values NOGAPS (6.2) Boundary Values
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PlansPlansPacific Basin HYCOM Simulation( 1/12Pacific Basin HYCOM Simulation( 1/1200) ) –– Evaluate RealEvaluate Real--time, assimilative Pacific HYCOMtime, assimilative Pacific HYCOM
US west Coast regionUS west Coast regionCompare with Observations/ NCOMCompare with Observations/ NCOM
Nested Eastern Pacific HYCOMNested Eastern Pacific HYCOM–– Force with High Resolution COAMPS ( 81/27/9/3 km)Force with High Resolution COAMPS ( 81/27/9/3 km)–– 22--3 km resolution experiments3 km resolution experiments–– Evaluate HYCOM Evaluate HYCOM
As a coastal ModelAs a coastal ModelCoupled Ecosystem Coupled Ecosystem model(smodel(s))Impact of vertical coordinate on Ecosystem responseImpact of vertical coordinate on Ecosystem responseImpact of Model choice on Ecosystem responseImpact of Model choice on Ecosystem response
–– HYCOM; NCOM; ROMSHYCOM; NCOM; ROMS–– RealReal--time HYCOM for the US west Coasttime HYCOM for the US west Coast
Force with RealForce with Real--time COAMPS ( 3 km Resolution)time COAMPS ( 3 km Resolution)Add data assimilation for physical componentAdd data assimilation for physical componentBoundary conditions from RealBoundary conditions from Real--time Pacific HYCOMtime Pacific HYCOMCombine with RealCombine with Real--time MODIS Ocean Colortime MODIS Ocean Color
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PlansPlansPacific Basin HYCOM Simulation( 1/12Pacific Basin HYCOM Simulation( 1/1200) ) –– Evaluate RealEvaluate Real--time, assimilative Pacific HYCOMtime, assimilative Pacific HYCOM
US west Coast regionUS west Coast regionCompare with Observations/ NCOMCompare with Observations/ NCOM
Nested Eastern Pacific HYCOMNested Eastern Pacific HYCOM–– Force with High Resolution COAMPS ( 81/27/9/3 km)Force with High Resolution COAMPS ( 81/27/9/3 km)–– 22--3 km resolution experiments3 km resolution experiments–– Evaluate HYCOM Evaluate HYCOM
As a coastal ModelAs a coastal ModelCoupled Ecosystem Coupled Ecosystem model(smodel(s))Impact of vertical coordinate on Ecosystem responseImpact of vertical coordinate on Ecosystem responseImpact of Model choice on Ecosystem responseImpact of Model choice on Ecosystem response
–– HYCOM; NCOM; ROMSHYCOM; NCOM; ROMS–– RealReal--time HYCOM for the US west Coasttime HYCOM for the US west Coast
Force with RealForce with Real--time COAMPS ( 3 km Resolution)time COAMPS ( 3 km Resolution)Add data assimilation for physical componentAdd data assimilation for physical componentBoundary conditions from RealBoundary conditions from Real--time Pacific HYCOMtime Pacific HYCOMCombine with RealCombine with Real--time MODIS Ocean Color time MODIS Ocean Color
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