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Provided by Eric P. Chassignet, COAPS, Florida State University

HYCOM High Resolution Modeling. Provided by Eric P. Chassignet, COAPS, Florida State University. Twin 1/12  Global HYCOM Simulations. HYCOM without Tides Climatological spin-up: 1979-2002 2 nd ECMWF Reanalysis scaled to QuikSCAT wind speed

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Provided by Eric P. Chassignet, COAPS, Florida State University

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  1. HYCOM High Resolution Modeling Provided by Eric P. Chassignet, COAPS, Florida State University

  2. Twin 1/12 Global HYCOM Simulations • HYCOM without Tides • Climatological spin-up: 1979-2002 2nd ECMWF Reanalysis scaled to QuikSCAT wind speed • Then 01/2003 – 06/2008 3-hourly 0.5° NOGAPS forcing scaled to QuikSCAT • KPP mixed layer • Advect T & S • Daily global 3-D archive files • HYCOM with Tides • Includes tidal forcing and slightly increased interfacial diffusion • 7/2003 – 06/2008 • 8 largest constituents (M2, S2, K1, O1, N2, P1, K2, Q1) forward tides • Whole domain daily averaged files • Hourly 3-D archive files, Global: May 2004 Small subdomains: 08/2005 – 06/2008 Arbic, Wallcraft, and Metzger

  3. Sea Surface Elevation Error in HYCOM with Winds and Tides Computed with standard set of 102 pelagic tide gauges (Shum et al. 1997)

  4. Eddy Resolving Global Prediction With Tides Eight largest tidal constituents in a 32-layer .08° global HYCOM simulation with NOGAPS atmospheric forcing Hourly steric SSH Hourly non-steric SSH Internal tidal signature seen in the steric SSH signal Propagation of tides is consistent with Robertson and Ffield (2008)

  5. Difference in Steric SSH Over 6 Hours June 30 2006: 06Z – 00Z -10 -5 0 5 10 (cm)

  6. Initial 1/25° Global HYCOM Simulation • Climatological spin-up: • Start from January GDEM3 climatology • 1979-2002 ERA-40 scaled to QuikSCAT wind speed • KPP mixed layer • Improvements over earlier 1/12 simulations: • Equation of state quadratic (vs linear) in salinity • More accurate thermobaric correction • More accurate vertical remapping of layers • Also run a 1/12 exact twin • Both have run for 5 model years Zamudio, Metzger,Wallcraft

  7. Gulf Stream Sea Surface Height Variability • Along-track from four satellite altimeters (Hurlburt and Hogan, 2008) • b) 1/12 global model year 3 • c) 1/25 global model year 3 (a) (b) (c)

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