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U.S. GODAE: Global Ocean Prediction with the Hybrid Coordinate Ocean Model (HYCOM). Community Effort: NRL, U. of Miami, Los Alamos, NOAA/NCEP, NOAA/AOML, NOAA/PMEL, PSI, FNMOC, NAVOCEANO, SHOM, LEGI, OPeNDAP, UNC, Rutgers, USF, Fugro-GEOS, Orbimage, Shell, ExxonMobil.

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u s godae global ocean prediction with the hybrid coordinate ocean model hycom

U.S. GODAE: Global Ocean Prediction with the Hybrid Coordinate Ocean Model (HYCOM)

Community Effort:NRL, U. of Miami, Los Alamos, NOAA/NCEP, NOAA/AOML, NOAA/PMEL, PSI, FNMOC, NAVOCEANO, SHOM, LEGI, OPeNDAP, UNC, Rutgers, USF, Fugro-GEOS, Orbimage, Shell, ExxonMobil

Presented by Harley Hurlburt, NRL Stennis, USA

International GODAE Steering Team Meeting X

Met Office UK

Exeter, UK

14-16 Nov 2005

slide2

Present U.S. Navy Operational Capabilities Related to GODAE

Viewable on the web

http://www.ocean.nrlssc.navy.mil/global_nlom

http://www.fnmoc.navy.mil/PUBLIC

http://www.navo.navy.mil

1 T239 or ~1/2 for atmospheric model boundary condition (on GODAE server)

2 Provide subsurface temperature

  • Real-time altimetry via NAVO Altimeter Data Fusion Center (ADFC)
  • NLOM: NRL Layered Ocean Model
  • GODAE: Global Ocean Data Assimilation Experiment
  • FNMOC operates a GODAE data server with data and products

from a variety of sources, including real-time altimetry from the NAVO ADFC

slide3

U.S. Navy Future Operational Transitions Related to GODAE

Participants: FNMOC, NAVO, NRL, ONR, Univ, Contractors

1 High vertical resolution for mixed layer prediction. Assimilates SSH from NLOM.

Running in real-time, see http://www.ocean.nrlssc.navy.mil/global_ncom

2 Running in real-time, see http://www.ocean.nrlssc.navy.mil/global_nlom

3For coupled ocean-atmosphere prediction.

4 To give NAVO/Navy experience with HYCOM without official operational status;

to be replaced by global HYCOM including the 1/25 Black Sea HYCOM

5Under the National Ocean Partnership Program (NOPP), 1/12 Atlantic HYCOM

demo is already running in near real-time. Includes the Mediterranean Sea.

Results at http://hycom.rsmas.miami.edu/ocean_prediction.html (80Tb LAS server soon)

slide4

User Interest in Real-time Global Ocean Products

NRL Oceanography Division Web Site Hit Statistics during 2004

Top 25 Countries and # Hits

Includes the following real-time global

Ocean products and other results

Altimeter data

MODAS SSH & SST analyses

Ocean prediction systems

1/16 global NLOM

1/8 global NCOM

1/12 Atlantic HYCOM

08 global hycom snapshot ssh and ice gray
.08° Global HYCOM snapshot: SSH and ice (gray)

May 2 model year 8

Climatological ERA15 forcing - HYCOM σ2* with 32 layers and GISS mixed layer

08 global hycom mean gulf stream and kuroshio pathways
.08° Global HYCOM Mean Gulf Stream And Kuroshio Pathways

Mean over four model years

ERA15 climatological wind &

thermal forcing

global ssh variability
Global SSH Variability

Oct 92 – Nov 98 SSH

variability based on T/P,

ERS-1 and ERS-2 altimeters

(from Collecte, Localisation,

Satellites (CLS))

SSH variability from .08°

global HYCOM σ2* with

climatological wind and

thermal forcing

slide8

122°E

123°E

124°E

119°E

120°E

121°E

100

200

300

100

200

m/s

300

Sb-ADCP data from Liang et al. (2003, DSR Pt. II)

Mean from HYCOM with ERA15 wind and thermal forcing

No ocean data assimilation in HYCOM

Velocity Cross-section Along Luzon Strait

Sb-ADCP data (top) vs. .08° global HYCOM (bottom) in the upper 300 m

Section along 21°N between 118.5°E and 124.0°E

Cross-section overlaid on

mean currents and speed

slide13

Nowcast Velocity field at 50 m depth superposed on the Temperature field from May 11 – June 13

slide14

NOAA/NCEP Atlantic Ocean Forecast System

Tide Gauge Comparisons for Hurricane Katrina

Pensacola, FL

Dauphin

Island, AL

29 Aug 05

00:00

30 Aug 05

00:00

31 Aug 05

00:00

29 Aug 05

00:00

30 Aug 05

00:00

31 Aug 05

00:00

28 Aug 05

00:00

28 Aug 05

00:00

Days

Days

Waveland, MS

Ocean

Springs, MS

Pilot’s

Station,

LA

29 Aug 05

00:00

30 Aug 05

00:00

31 Aug 05

00:00

28 Aug 05

00:00

29 Aug 05

00:00

30 Aug 05

00:00

28 Aug 05

00:00

29 Aug 05

00:00

30 Aug 05

00:00

28 Aug 05

00:00

Days

Days

Days

slide15

Consistency NAT Hycom and WFS ROMS

WFS ROMS SST and surface velocity is shown inside the dashed line and outside of this area is the NAT HYCOM model.

Warm water is detached from the Loop Current and transported northward as mesoscale eddies and filaments.

From A. Barth, A. Alvera-Azcárate, R. He, R. H. Weisberg

University of South Florida

slide16

Comparison with in situ velocity

  • Velocity at station C15 (10m isobath).
  • Due to a better representation of the coast geometry, the WFS ROMS model provides better results than the NAT HYCOM. The OI Winds also improve the model accuracy.

From A. Barth, A. Alvera-Azcárate, R. He, R. H. Weisberg

University of South Florida

sab nested finite element model
SAB Nested Finite Element Model

UNC-SAB modeling system sequence that nests the regional-scale QUODDY implementation (middle) within the 1/12 deg operational HYCOM-GODAE model (left). The limited-area QUODDY implementation (right) includes the estuary and tidal inlets along the Georgia/South Carolina coast and extends to the shelf-break.

From Brian Blanton, University of North Carolina-Chapel Hill

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