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D evelopment of a Regional Coupled Ocean-Atmosphere Model

2.2. D evelopment of a Regional Coupled Ocean-Atmosphere Model. Hyodae Seo, Arthur J. Miller, John O. Roads, and Masao Kanamitsu Scripps Institution of Oceanography. 6th Conference on Coastal Atmospheric and Oceanic Prediction and Processes

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D evelopment of a Regional Coupled Ocean-Atmosphere Model

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  1. 2.2 Development of a Regional Coupled Ocean-Atmosphere Model Hyodae Seo, Arthur J. Miller, John O. Roads, and Masao Kanamitsu Scripps Institution of Oceanography 6th Conference on Coastal Atmospheric and Oceanic Prediction and Processes 85th AMS Annual Meeting January 11, 2005, San Diego

  2. Introduction Development of a coupled model system to study air-sea interaction processes to improve ocean-atmosphere prediction TODAY (Preliminary Results): What are some effects of evolving SST on the coupled model fluxes? RESULTS TO BE PRESENTED: SST spatial structures are clearly seen in the flux fields. SST affects shortwave fluxes (cloudiness) in the summer. SST tendency is strongly correlated with latent heat flux anomaly in summer. - Related to observational studies: Ronca and Battisti (J. Climate,1997), Chelton et al. (Science,2004)

  3. Outline 1. Description of Regional Coupled Ocean-Atmosphere Model and Experiments 2. Interaction of the Atmospheric and Oceanic Response • Co-variability of SST anomaly (and its tendency) with components of heat flux anomalies (cf. Ronca and Battisti, 1997) 3. Conclusion and Future Work

  4. Regional Spectral Model(RSM, 20km) Regional Ocean Modeling System (ROMS, 12km) net heat flux freshwater flux windstress Primitive equation ocean model Generalized-sigma vertical coordinate Radiation and flow-adaptive nudging for open boundaries The RSM is nested within the Global Spectral Model (GSM). Physics and dynamics are consistent with the NCEP/DOE reanalysis model. Winds relative to currents SST Lateral BC: Levitus T/S Climatology IC and Lateral BC: Reanalysis Regional Coupled Ocean-Atmosphere Model

  5. +2000m Pt. Reyes Sierra-Nevada Pt. Sur Pt. Conception Continental Shelf San Diego -4000m Model Domain and Experiment Northeastern Pacific Model Run from 1996 to 2003 with Daily Coupling of Forcings.

  6. Interannual Variability of SST Snapshots of Averaged SST of May 10 - 14, 1998-2003 1998 1999 2000 -Upwelling filaments in SST occur north of Pt. Conception -Mesoscale eddies and meanders of the CCS generate strong SST gradients  Do these mesoscale SST features affect the local atmospheric boundary layer? Upwelling Filaments CCS Mesoscale Eddy 2001 2002 2003 Pt. Reys Pt. Sur Pt. Conception SST(°C) 9 20

  7. SST Patterns in Heat Flux and Wind Stress Fields Example: May 10-14, 1999 Net Surface Heat Flux (W/m2 ) Windstress Curl (N/m3 ) SURFACE FLUXES 26.4 Isopycnal Depth(m) SST(°C) OCEANIC VARIABLES How do the ocean fields and surface fluxes covary?

  8. Net Heat Flux Components for 10-14, May, 1999 Net Heat Flux (W/m2 ) Shortwave Radiation Longwave Radiation Net Heat Flux = Shortwave + Longwave + Latent + Sensible Latent Heat Sensible Heat SST

  9. Normalized Covariance (NC) Summer months (JJASO) of 5 day-averaged 7-year data (monthly mean removed) NC of dSST’/dt for 2 regions NC = • • Local NC of dSST’/dt with latent heating • • • Normalized Covariance • • • shortwave sensible longwave latent Covariance of SST tendency with each heat flux in Summer months Ronca and Battisti: Latent heat flux significantly covaries with windspeed.

  10. Normalized Covariance (NC) NC = NC of SST’ for 2 regions • Local NC of SST’ with each component Normalized Covariance shortwave Sensible heat • • • • • • • sensible shortwave longwave latent Covariance of SST and each heat flux in Summer months Negative correlation of SST with cloudiness in summer -(Klein and Hartmann(1993), Norris and Leovy(1994))

  11. Conclusion • 1. SST spatial structures are clearly seen in the flux fields. • 2. SST tendency is strongly correlated with latent heat flux in summer month (in spite of mesoscale eddy signatures in SST) • 3. SST affects solar heating flux through cloudiness in the summer months.

  12. Future Work - Future Work Include ocean currents in calculation of coupled model windstress Replace climatological boundary condition with ocean analysis Multi-nesting coupled modeling Thank you!

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