HYCOM in the South Atlantic Bight: Performance and Client Applications
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1 HYCOM in the South Atlantic Bight: Performance and Client Applications Brian Blanton, Alfredo Aretxabaleta Department of Marine Sciences UNC-Chapel Hill
2 UNC Group Activities HYCOM/GODAE NOPP Provide SEACOOS - South Atlantic Bight (SAB) modeling component SCOOP - Operational Storm-surge and Inundation project High-res operational storm surge, Ensemble Approach -Katrina Reanalysis
3 NOPP/HYCOM Activities in the SAB Comparison of HYCOM to SAB Observations SAB Water levels Mid-shelf temperature Cape Hatteras CODAR Simulations in the SAB : Nested Applications Hindcasting Strong event studies (e.g. Summer 2003 cooling) Evaluation of HYCOM BCs in SAB Shelf/coastal zone Prediction System Evolution of SABLAM South Atlantic Bight Limited Area Model Previously NOPP-funded project (FY00-FY03)
4 Obs and HYCOM in the SAB Cape Hatteras CODAR Installation Capturing GS Surface Variability Duck Radials Hatteras Radials Gulf Stream
5 Obs and HYCOM in the SAB Mean Surface U,V Var(Speed) HYCOM Sept 2003 CODAR Mean velocity (vectors) and speed variance (color) in the Cape Hatteras region for the month of September 2003.
6 Obs and HYCOM in the SAB Spatial (Surface) EOFs - Speed 97% 1 st MODE Mean Path 2 nd MODE Meander 1% 0.5% 3 rd MODE??? HYCOM 71% 4% 2% CODAR
7 Obs and HYCOM in the SAB Spatial EOFs - Velocity 94% 1 st MODE Mean Path 2 nd MODE Meander 2% 0.5% 3 rd MODE??? HYCOM 42% 14% 8% CODAR Cape Hatteras HYCOM mixed layer (upper) and CODAR (lower) first three complex principal components. The percent variance represented by each mode is also reported. The EOFs are computed for the month of September 2003.
8 Obs and HYCOM in the SAB Water levels and Temperature Daily Coastal Water Levels Ft. Pulaski Mid-shelf Surf Temp Virginia Key Sea level Std. Dev. [m] Ft. Pulaski OBS.16 HYCOM.11 Strong Eastcoast-wide Cooling in Summer 2003 RMSE = 1.2 deg C R2 Virginia Key.10.05
9 HYCOM (Best-Estimate) Transports in the SAB
10 Primary Modeling Objectives: Currently, neither basin-scale nor regional-scale models can include all relevant scales/physics for shelf prediction Inner-shelf coast-20m isobath Tides, Winds, Rivers Mid-shelf 20m-50m isobaths Winds, Tides, Q-Flux Outer-shelf 50m-Shelfbreak W.B.C. Influences We augment basin-scale HYCOM TS initializations and estimates of TS and sea level along a limited-area domain open boundary, with locally enhanced resolution, physics, and forcing, through nesting procedures.
11 SAB Modeling Additions using HYCOM as IC and BC estimator Resolution Bathymetry Coastal Wall Rivers HYCOM (NRL) ~1/12 deg O(10 km) ETOPO5 + local improvements ~10-m isobath NONE in SAB QUODDY 50 m to 5 km NGDC Coastal Relief Model 0-m contour line in NGDC CRM 7 Tides NONE Tides (Blanton et al, 2004.)
12 SAB Nested Regional and Limited-Areas Models 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.
13 SAB Limited-Area Model Example of Estuary-to to-shelfbreak Finite Element Mesh Coastal Simulation Engine: QUODDY Nonlinear, prognostic, finite element (Lynch et al, CSR, 1996) Pointwise-Corrected Transport (Kliem, OM, 2004)
14 SAB HYCOM -->> QUODDY Interpolated to regular grid for Viz. Init Date=21 Nov day tidal spinup from 16 Nov HYCOM HC/FC TS on OBC
15 SAB HYCOM -->> QUODDY Cross-shelf temp. trans. Init Date 14 Nov day tidal spin-up from 16 Nov HYCOM HC/FC TS on OBC
16 Temperature HCs Surface Temp. Gray s Reef (Oct-Nov 2005) Bottom Temp. R2 Tower (Oct-Nov 2005) Regional QUODDY Various Initializations HYCOM BestEst SAB Climatology Forcing: Tides NAM Fluxes OBC: Climatology HYCOM
17 NCCOOS Webpage
18 NAM SST ADCIRC SSH ADCIRC SVel HYCOM SST HYCOM SSH HYCOM SVel
19 Plans Links to NCEP HYCOM (Lozano/Rao) Coupled HYCOM/WRF winds and pressure for stormsurge applications Smoother shelfbreak transition Higher NC/FC update frequency Move to Baroclinic ADCIRC Main Advantage: MPI!!!!! Formal BC impact analysis FC Skill Assessment of BCs General basin-scale model issues: Coastal Wall definition Bathy in SAB
20 Data Access/Distribution In demonstration mode, which we are in, timely availability of HYCOM NC/FC is not critical. In future Operational modes, immediate availability of NC/FC IS critical. We need to consider peer-to-peer methods?? LDM - push of solutions as they become available at NRL?? Replica services
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