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Summer School Rio de Janeiro March 2009 5. MODELING MARITIME PBL

Summer School Rio de Janeiro March 2009 5. MODELING MARITIME PBL. Amauri Pereira de Oliveira. Group of Micrometeorology. Topics. Micrometeorology PBL properties PBL modeling Modeling surface-biosphere interaction Modeling Maritime PBL Modeling Convective PBL. Modeling Maritime PBL.

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Summer School Rio de Janeiro March 2009 5. MODELING MARITIME PBL

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  1. Summer SchoolRio de JaneiroMarch 20095. MODELING MARITIME PBL Amauri Pereira de Oliveira Group of Micrometeorology

  2. Topics • Micrometeorology • PBL properties • PBL modeling • Modeling surface-biosphere interaction • Modeling Maritime PBL • Modeling Convective PBL

  3. Modeling Maritime PBL

  4. Maritime PBL • Inertial layer; • Roughness layer. Sjöblom, A. and Smedam, A.S., 2003: Vertical structure in the marine atmospheric boundary layer and its implication for the inertial dissipation method, Boundary-Layer Meteorology, 109, 1-25

  5. What is going on beneath the ocean surface Thorpe, S.A., 2004: Recent developments in the study of ocean turbulence. Ann. Rew. Earth Planet. Science., 32, 91-102.

  6. Oceanic mixed layer

  7. Air-Sea Interaction Edson et al., 1999: Coupled Marine Boundary Layers and Air-Sea Interaction Initiative: Combining Process Studies, Simulations, and Numerical Models.

  8. Some important discrepancies Wainer, et al., 2003: Intercomparison of Heat Fluxes in the South Atlantic. Part I: The Seasonal Cycle. Journal of Climate.

  9. Convective PBL over Cabo Frio • Cabo Frio – upwelling area • Upwelling - Stable PBL • Cold Front passage disrupt upwelling • Upwelling give place to a downwelling • Dowelling - Convective PBL

  10. References Dourado, M., and Oliveira, A.P., 2001: Observational description of the atmospheric and oceanic boundary layers over the Atlantic Ocean. Revista Brasileira de Oceanografia,49, 49-64. Dourado, M.S. and Oliveira, A.P., 2008: A numerical investigation of the atmosphere-ocean thermal contrast over the coastal upwelling region of Cabo Frio , Brazil, Atmosfera , 21(1) ,13-34. Available at: http://www.iag.usp.br/meteo/labmicro

  11. Cabo Frio upwelling SST AVHRR NOAA (Dutra et al. 2006, XV CBMET)

  12. Downwelling Upwelling

  13. Cold Front July 6, 21GMT

  14. Cold Front

  15. downwelling upwelling

  16. Second Order Closure Model Oceanic mixed layer model

  17. Mean equations Momentum Thermodynamic Specific Humidity

  18. Second Order Closure Model

  19. Oceanic Mixed Layer Model • The turbulent mixing is strong enough so that upper ocean is characterized by a mixed layer where the temperature does notvary in thevertical direction; • Transition layer between the mixed layer and the stratified non turbulent ocean bellow is much smaller than the mixed layer so that the vertical variation of temperature can be indicated by a temperature jump; • The energy required to sustain turbulent mixing is provided by convergence of the vertical flux of TKE.

  20. atmosphere Mixed layer ocean Oceanic Mixed Layer Model

  21. Oceanic Mixed Layer ModelTemperature (To)

  22. Derivation of OML Temperature equation

  23. Oceanic Mixed Layer Modeldepth (h) and temperature jump (ΔT)

  24. Turbulent heat flux effects

  25. Boundary (coupling) conditions Energy

  26. Oceanic Mixed Layer

  27. Atmospheric turbulent fluxes CH, CE and CD are transfer coefficient of sensible, latent and momentum (drag coefficient).

  28. Atmospheric turbulent fluxes

  29. Radiation balance at the surface Short wave down Short wave up Broadband transmissivity Albedo

  30. Radiation balance at the surfaceLong wave contribution Long wave up Long wave down ε = 0.98 Surface emissivity a = 0.52 and b = 0.064

  31. Boundary and coupling conditions Stress

  32. MIXING LAYER MODEL CLOSURE Applying TKE equation to transition layer

  33. MIXING LAYER MODEL CLOSURE In the interface Dimensional analysis

  34. Stationary: • 2. Shear production, molecular dissipation and pressure term are neglected in transition layer is neglected because: MIXING LAYER MODEL CLOSURE

  35. Mixing Layer Model Transition Layer

  36. Thermodynamic Equation Limit 0

  37. MIXING LAYER MODEL CLOSURE Thermal mixing Mechanical Mixing

  38. Stable and Convective Run

  39. Upwelling – Stable PBL Downwelling - Convective PBL

  40. Upwelling – Stable PBL Downwelling - Convective PBL

  41. Upwelling – Stable PBL Downwelling - Convective PBL

  42. Upwelling – Stable PBL Downwelling - Convective PBL

  43. PBL Time Evolution

  44. Fluxes and Variances

  45. Observations • FluTuA • Campaign May 2002 • Campaign December 2008

  46. FluTuAObservational campaign May 2002

  47. References Bacellar, S., Oliveira, A. P., Soares, J., and Servain, J., 2009: Assessing the diurnal evolution surface radiation balance over the Tropical Atlantic Ocean using in situ measurements carried out during the FluTuA Project. Meteorological Application.http://dx.doi.org/10.1002/met.111 Available at: http://www.iag.usp.br/meteo/labmicro/index_arquivos/Page779.htm

  48. Surface Emissivity ε = 0.97 ε = 0.97 Surface emissivity

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