Hyodae Seo, Art Miller and John Roads Scripps Institution of Oceanography


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Modeling of Regional Ocean-Atmosphere Feedback in the Eastern Equatorial Pacific; Tropical Instability Waves


Outline



Regional coupled model



Scripps Coupled Ocean-Atmosphere Regional (SCOAR) Model







Eastern equatorial Pacific domain; Review of ocean-atmoshere system



Changes in stability of ABL due to evolving SST



Modeled stability changes in ABL due to SST



Temporal and spatial associations: Combined EOFs of SST and wind stress



Modification of heat flux





Coupling of SST and wind stress and synchronous westward propagation



Coupling of wind stress and SST



Westward Propagation in the model

  • Co-propagation of SST and wind stress

  • Weaker coupling coefficient in the model than in the observations (e.g. Chelton et al., 2001)



Work in progress



Summary

  • A high-resolution coupled model has been developed and used in the various regions.

  • Main purpose is to investigate the ocean-atmosphere feedback on ocean mesoscale spatial and time scales.

  • Evolving SST front perturbed by the TIWs alters vertical stratification of ABL.  This leads to responses from ...

  •  the turbulent and radiative (implied from the model) heat flux, thus changing thermal component of the atmospheric forcing; a negative feedback.

  •  wind stress and its derivative fields, thus induces dynamic feedback from the atmosphere forcing; This feedback effect still remains uncertain.



Comments or questions? Thanks!



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