JHT Project: Evaluation and Improvement of Ocean Model Parameterizations for NCEP Operations L. K. Shay, G. Halliwell, J.Brewster, B. Jaimes, C. Lozano,

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Presentation transcript:

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

Outline: Oceanic Response Features Cold and Warm Core Eddies -Ivan (04) Loop Current/Warm Core Eddy Interactions (deep OML) 1. Katrina and Rita (05) 2. Gustav and Ike (08) 2010 HFP with NOAA IFEX/MMS/NASA/NSF Summary Recurrent Theme: 3-D Upper ocean observations are critical in understanding the response and interactions with atmosphere.

Integrated thermal structure (OHC) and vertical current shear. Current and shear central for mixing, cooling and, feedback to the storm. Changing ocean mixed layer depths affect feedback to the TC boundary layer kJ cm -2 Leipper and Volgenau (JPO, 1972)

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.

MOTIVATION: Ivan (2004) over the GOM SSH (cm) from HYCOM (from Halliwell et al., MWR, 2008). SST Analyses Northern Cyclone Southern Cyclone

HYbrid Coordinate Ocean Model (HYCOM) Hurricane Ivan Simulations 10 Sept-6 Oct 04 (Halliwell et al., 2010) Configuration: 0.04° Mercator grid, Gulf of Mexico domain No data assimilation performed Initial and boundary conditions from U.S. Navy HYCOM ocean nowcast-forecast system: Data assimilative ocean nowcast Navy Coupled Ocean Data Assimilation (NCODA) assimilation Atmospheric Forcing: Navy 27 km COAMPS atmospheric model Vector wind blended with higher resolution fields from HWIND Wind stress for HWIND calculated using Donelan cd

Hurricane Ivan Modeling Experiment Summary Model AttributeBaseline Experiment GOM1Alternate Experiments Horizontal resolution0.04° MercatorGOM2: 0.08° Mercator Vertical resolution26 layers, 4-8m in OMLGOM3: 21 layers, m in OML GOM4: 31 layers, 3-5m in OML Vertical mixingKPPGOM5: MY GOM6: GISS CDCD DonelanGOM7: Powell GOM8: Large and Pond GOM9: Large and Pond (capped) GOM10: Shay and Jacob C EL, C ES COARE3.0 algorithmGOM11: Kara et al. Atmospheric forcing27-km COAMPS+H*WINDGOM12: 27-km COAMPS only Outer modelNCODA GoM hindcastGOM13: Free GOM simulation Ocean Dynamics3-D Ocean PhysicsGOM14:1-D Column Models

Observed/Simulated Current Response at M9 (1.5 Rmax) from 7 Experiments Halliwell et al., MWR, (2009) Below cd using ocean response as a tracer in Shay and Jacob (2006)

Current Time Series 1.5 R max U (east-west) V (north-south)

Observed KPP (control) Mellor-Yamada GISS Vertical Mixing Conclusion: KPP mixing produces the most realistic shear response. Other two choices under- estimate entrainment, which reduces mixed layer deepening and SST cooling.

Difference in SST cooling GISS minus KPP mixing

Drag Coeff. Parameterization Observed Powell et al. Donelan et al. (control) Large and Pond Conclusion: parameterizations that yield coefficients between 2 x and 2.5 x at high wind speeds produce the most realistic shear response. Larger (smaller) coefficient Values increase (decrease) mixed layer deepening and SST cooling

The 2005 Loop Current System experiment twice the radius of maximum winds Moorings CCE2 LC Seawater temperature and conductivity data from four airborne surveys. Mooring data: velocity, temperature, and conductivity at ~10 m intervals. CCE1 WCE For the first time, the ocean response to major hurricanes was simultaneously measured inside cyclonic and anticyclonic geostrophic features.

cluster-averaged temperature profiles (Hurricane Rita) Loop Current bulge:  T ~ -1 o C 26 o C CCE:  T ~ -4.5 o C TC-induced cooling in geostrophic eddies (airborne data) Jaimes and Shay, MWR, 2009

Track and Intensity of TC’s Gustav and Ike Versus AXBTs relative to OHC and 26 o C Isotherm Depth. Gustav : 191 AXBTs 111 GPS Drifters Floats Ike : 216 AXBTs 111 GPS Drifters Floats SMFR, SRA measurements.

Progress Summary and Blueprint For Future Ivan a clear example of negative feedback (wake cooling/mixing induced by strong winds and Cold Core Ring) as opposed to positive feedback over the Loop Current and Warm Core Rings. Relative to the moored ocean measurements: Simulated shear response is a stringent test of model performance –KPP mixing outperforms Mellor-Yamada and GISS –Drag coefficient parameterizations that yield values between 2.0 x and 2.6 x (e.g. Donelan et al.) outperform those that yield larger or smaller values –No need to use vertical resolution of < 10 m with KPP mixing –Same conclusions realized at other SEED moorings (not shown) Model evaluation must be extended to other storms and to differing ocean regions (Katrina and Rita (05); Frances (04); Gustav and Ike (08) High quality ocean observations are critically important for model evaluations (e.g., NOAA IFEX, MMS, NASA GRIP this summer)

NOAA WP-3D profiling over MMS Moorings (IFEX, NASA GRIP) Expendables deployed from P-3 and proposed moorings relative to the LC, WCE and CCE superposed on late Sept 05 altimetry derived 26 o C isotherm Depth (After Rita). Deliverables include: V, T, S profiles to m resolution. Surface winds (SFMR, GPS) provided by HRD. Atmospheric profiles of V, T and 5-m resolution.