U.S. GODAE: Global Ocean Prediction with Community Effort: NRL, FSU, U. of Miami, NASA-GISS, NOAA/NCEP, NOAA/AOML, NOAA/PMEL, PSI, FNMOC, NAVOCEANO, SHOM, LEGI, OPeNDAP, UNC, Rutgers, USF, Fugro-GEOS, Orbimage, Shell, ExxonMobil

GODAE: The vision "A global system of observations, communications, modeling and assimilation, that will deliver regular, comprehensive information on the state of the oceans in a way that will promote and engender wide utility and availability of this resource for maximum benefit to society."

Objectives and Goals A broad partnership of institutions that collaborate in developing and demonstrating the performance and application of eddy-resolving, real-time global and basin-scale ocean prediction systems using HYCOM. Transition to operational use by the U.S. Navy at NAVOCEANO and by NOAA at NCEP.

Objectives and Goals Strong participation of the coastal ocean modeling community in using and evaluating boundary conditions from the global and basin-scale ocean modeling prediction systems Efficient data distribution (100 Terrabytes Storage Area Network) The data are available to the community at large within 24 hours via Live Access Server (LAS), ftp, and OPeNDAP at http://www.hycom.org

STORAGE AREA NETWORK Three 8 CPU machines 32 GB RAM/machine 100 TB Fibre Channel SAN Three 8 CPU machines 32 GB RAM/machine Software Red Hat Linux Red Hat cluster suite and Global File System Apache Web Server THREDDS LAS Server Vsftpd server The All files are unzipped and hence 1-3 min of time saved for individual files access by eliminating the unzipping part. Makes big difference when extracting a time series.

Currently Available Datasets Daily outputs from the real time Global HYCOM+NCODA analysis Global HYCOM+NCODA analysis (2004- present) Global non-assimilative HYCOM (2003-2007) Near real-time 1/12 Atlantic Ocean prediction system output (June 2003 – Present) Monthly mean 1/12 Pacific Ocean simulation output (1978-2003)

nowcast/forecast systems Present nowcast/forecast systems 1/12º global real time system (NRL) - 4500 x 3298 grid points, ~6.5 km spacing on average, ~3.5 km at pole - 32 σ2* vertical coordinate surfaces - Monthly river runoff (986 rivers) - NOGAPS atmospheric forcing - Assimilation: NCODA 1/25º Gulf of Mexico real time system (NRL) - Running since November 2006 - Assimilation: NCODA - 5 day hindcast, 7 day forecast NOAA/NCEP Atlantic real-time system - Orthogonal grid (1200 x 1684 points) - 25 vertical coordinates (18 isopycnal, 7 z-level) - Forcing fields from 3-hour NCEP (GDAS/GFS) model - Tides:M2, S2, N2, K1, P1, O1, K2, Q1 tidal modes - Rivers from daily USGS data and RIVDIS climatology - Data Assimilation (SSH, SST,T, S, profiles) Present near real-time system, Atlantic Ocean, run since July of 2002. Only gridded full field surface observations are assimilated in this system. Running on kraken on 28 nodes, 224 cpus. Results on the hycom consortium web page and there is a LAS server where the data can be obtained.

with assimilation (GLBa0.08-60.4)

without assimilation (GLBa0.08-05.8)

Overall increase in variability - largest changes occur in the western boundary currents

1/12º Global HYCOM SSH and surface drifters Smedstad et al.

Eddy Kinetic Energy Comparison Surface EKE in the Gulf Stream 3000 cm2/s2 2500 2000 1500 1000 500 Observations from Fratantoni (2001) – Based on 1990-99 surface drifters NCOM - 2004 HYCOM - 2004 Observations based on 15m drougued drifters over the period 1990-1999.

Eddy Kinetic Energy Comparison EKE at ~700 m in the Gulf Stream Observations from Schmitz (1996) NCOM - 2004 HYCOM - 2004

Forecast verification statistics from .08 global HYCOM 1.0 0.9 0.8 0.7 World Ocean NW Arabian Sea and Gulf of Oman Gulf Stream Median SSH anomaly correlation 1.0 0.9 0.8 0.7 Equatorial Pacific Kuroshio Gulf of Mexico 0.6 10 20 30 Forecast length (days) 4 Forecasts included in statistics

Product evaluation Assessment of the outputs by comparison to independent observations Comparison with other GODAE products (i.e. MERSEA collaboration) Strong involvement of coastal ocean modeling groups to use and evaluate boundary conditions provided by the global and basin HYCOM real time prediction system outputs

(G. Halliwell, U. of Miami) Ivan Simulation (G. Halliwell, U. of Miami) Blended NOGAPS wind field with HWIND gridded vector wind fields from NOAA/HRD

West Florida Shelf Modeling WFS ROMS SST and surface velocity is shown inside the dashed line and outside of this area is the North Atlantic HYCOM. Warm water is detached from the Loop Current and transported northward as mesoscale eddies and filaments. Barth et al. (USF)

Regional model for South Florida seas SoFLA-HYCOM (South Florida Hybrid Coordinate Ocean Model) Surface temperature and velocity Nested boundaries Kourafalou et al. (U. of Miami)

Nested South Atlantic Bight Finite Element Model UNC-SAB modeling system sequence that nests the regional-scale QUODDY implementation (middle) within the 1/12° near real-time 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. Blanton et al. (UNC)

US West Coast HYCOM with Biology Nested in 1/12° Global HYCOM Basin Basin-wide currents and gyre systems realistically represented. Kuroshio that easily transitions between meander and straight path modes. Boxes and lines are locations where model-data comparisons will be shown. Kindle et al. (NRL)

Wetting and Drying in HYCOM Mont St Michel Wetting and Drying in HYCOM

Wetting and Drying in HYCOM Baraille et al. (SHOM) 0 meter layer thickness

In order to achieve these goals Continued community involvement to ensure that the numerical codes, data assimilation, framework, etc. are state-of-the-art and to maintain credibility Continued availability of a server for easy access to the model outputs and provision of boundary conditions Minimum dispersion of efforts among partners and users