Evaluation and Improvement of Ocean Model Parameterizations for NCEP Operations L. K. Shay, G. Halliwell, J.Brewster, C. Lozano, W. Teague MPO, RSMAS,

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Presentation transcript:

Evaluation and Improvement of Ocean Model Parameterizations for NCEP Operations L. K. Shay, G. Halliwell, J.Brewster, C. Lozano, W. Teague MPO, RSMAS, Univ. of Miami EMC-NCEP Oceanography Department, NRL-Stennis

MOTIVATION: SHA field from GFO altimeter (left panels) and SST Image from TMI (right) Relative to Katrina’s track & intensity. Severe Storm (Cat 3 or above) Tracks (red) relative to the posit of the LC and WCR complex based on satellite data in Aug 05. LC

Ivan’s Track and Intensity Relative to OHC (left) NRL SEED Mooring Locations in Northern Gulf of Mexico Relative to Bottom Depth (Right) (Teague et al., JPO, 2007). 14 ADCP moorings- Focus here in Array 9.

Objectives: Ivan an example of negative feedback (cooling and Cold Core Ring) as opposed to less negative feedback (Loop Current/Warm Core Rings) By building on a previous JHT (Jacob et al.), specific objectives of this grant are: optimizing spatial resolution that will permit the ocean model to run efficiently as possible without degrading the simulated response; improving the initial background state provided to the ocean model; improving the representation of vertical and horizontal friction and mixing; generating realistic high-resolution atmospheric forcing fields necessary to achieve these objectives; and Testing differing formulations of the drag coefficient (cd).

HYbrid Coordinate Ocean Model (HYCOM) Hurricane Ivan Simulations 10 Sept-6 Oct 04 Configuration: 0.04° Mercator grid, Gulf of Mexico domain No data assimilation performed Initial and boundary conditions U.S. Navy HYCOM ocean nowcast-forecast system: Data assimilative ocean nowcast Navy Coupled Ocean Data Assimilation (NCODA) assimilation Atmospheric Forcing: Navy 0.5 o NOGAPS atmospheric model Vector wind blended with higher resolution fields from HWIND Wind stress for HWIND calculated using Donelan cd

Hurricane Ivan Modeling Experiment Summary ExpVertical Layers Nearsurface Layer Thickness Range (m) Vertical Mixing Surface Forcing Outer Nesting Model EXP1 (base) 264-8KPPNOGAPS+ HWIND NCODA EXP KPPNOGAPS+ HWIND NCODA EXP KPPNOGAPS+ HWIND NCODA EXP4264-8MYNOGAPS+ HWIND NCODA EXP5264-8GISSNOGAPS + HWIND NCODA EXP6264-8KPP° NOGAPS NCODA EXP7264-8KPPNOGAPS +HWIND NONE

Ivan’s eye of over the moorings (dots) at 00 UTC on 16 Sept 04. (a) Wind stress (Pa) with winds, (b) frictional wind velocity (m s -1 ), (c) wind stress divergence (s -1 ) (d) wind stress curl (s -1 ). Based on HWIND fields.

Intense Forcing (upper) and Relaxation Stages (lower) for NRL SEED moorings Red ~500 m Yellow~1000 m (Teague et al. JPO, 2007).

Pre Ivan SST Post-Ivan SST Pre-Post Ivan ΔSST TMI and KPP SST Comparisons

Summary of Major Differences Relative to Base State with KPP Mixing. ExperimentsDifference Factor from Base Experiment ΔSST ( o C) ΔOHC (kJ cm -2 ) EXP2 minus EXP1Lower vert. res EXP3 minus EXP1Higher vert. res EXP4 minus EXP1MY mixing EXP5 minus EXP1GISS mixing EXP6 minus EXP1No HWIND EXP7 minus EXP1No assimilation EXP5 minus EXP

SST Comparisons ( o C) in Cold (Cyclone) and Warm (Anticyclones) for Each Mixing Scheme TMIAVHRRGISS Sim. MY Sim. KPP Sim. Northern Cyclone (coldest T) 24.9~ Southern Cyclone (coldest T) 24.6~ Anticyclone (26-28 o N, o W) 28.0~

NRL Mooring Specifics (Teague et al., JPO, 2007). Note ADCP provides absolute velocity (u,v,w) Array #Lat o N Long o W Start Date 2004 End Date 2004 Δt (hr) Depth Range (m) Δz (m) Bottom Depth (m) Instrumen t Type /0110/ TRBM /0311/ LR /0311/ LR /0511/ LR

Observed KPP MY GISS Current Time Series 1.5 R max U (east-west) V (north-south) Normalization (  max R max )/(  0 bU h ) = 20 cm s -1

M9 (1.5 Rmax) Observed and Near-Inertial Current Shear Response (R max = 32 km) Normalized shear by s -1 based on Lili Data.

Progress and Blueprint For Future Ivan a clear example of negative feedback (cooling/mixing induced by strong winds and Cold Core Ring) as opposed to positive feedback over the Loop Current and Warm Core Rings. SST modulated by warm and cold ocean features that have to be properly initialized in ocean models and mixing. Data Assimilation essential! Trifecta Katrina, Rita and Wilma is next. Observed and simulated momentum response from deep ocean to the shelf. Potential for a student dissertation. Fields need to be made available to TC community. Temperatures and currents needed to assess mixing schemes and evaluate initialization schemes. Expendables (AXCP, AXCTD, drifters) needed – Targeted Obs! Working with MMS on their 5-year Loop Current Dynamical Study, NOAA HFIP and NSF