Summer school rio de janeiro march 2009 5 modeling maritime pbl
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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

Summer SchoolRio de JaneiroMarch 20095. MODELING MARITIME PBL

Amauri Pereira de Oliveira

Group of Micrometeorology


Topics
Topics

  • Micrometeorology

  • PBL properties

  • PBL modeling

  • Modeling surface-biosphere interaction

  • Modeling Maritime PBL

  • Modeling Convective PBL



Maritime pbl
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


What is going on beneath the ocean surface
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.



Air sea interaction
Air-Sea Interaction

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


Some important discrepancies
Some important discrepancies

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


Convective pbl over cabo frio
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


References
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


Cabo frio upwelling
Cabo Frio upwelling

SST

AVHRR NOAA

(Dutra et al. 2006, XV CBMET)


Upwelling

Downwelling

Upwelling


Cold front july 6 21gmt
Cold Front July 6, 21GMT



Upwelling1

downwelling

upwelling


Second order closure model oceanic mixed layer model
Second Order Closure Model Oceanic mixed layer model


Mean equations
Mean equations

Momentum

Thermodynamic

Specific Humidity



Oceanic mixed layer model
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.


Oceanic mixed layer model1

atmosphere

Mixed layer

ocean

Oceanic Mixed Layer Model


Oceanic mixed layer model temperature t o
Oceanic Mixed Layer ModelTemperature (To)



Oceanic mixed layer model depth h and temperature jump t
Oceanic Mixed Layer Modeldepth (h) and temperature jump (ΔT)





Atmospheric turbulent fluxes

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



Radiation balance at the surface
Radiation balance at the surface

Short wave down

Short wave up

Broadband transmissivity

Albedo


Radiation balance at the surface long wave contribution
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



Mixing layer model closure
MIXING LAYER MODEL CLOSURE

Applying TKE equation to transition layer


Mixing layer model closure1
MIXING LAYER MODEL CLOSURE

In the interface

Dimensional analysis


Mixing layer model closure2

  • Stationary:

  • 2. Shear production, molecular dissipation and pressure term are neglected in transition layer is neglected because:

MIXING LAYER MODEL CLOSURE


Mixing layer model
Mixing Layer Model

Transition

Layer


Thermodynamic Equation

Limit 0


Mixing layer model closure3
MIXING LAYER MODEL CLOSURE

Thermal mixing

Mechanical Mixing



Upwelling stable pbl
Upwelling – Stable PBL

Downwelling - Convective PBL


Upwelling stable pbl1
Upwelling – Stable PBL

Downwelling - Convective PBL


Upwelling stable pbl2
Upwelling – Stable PBL

Downwelling - Convective PBL


Upwelling stable pbl3
Upwelling – Stable PBL

Downwelling - Convective PBL




Observations
Observations

  • FluTuA

    • Campaign May 2002

    • Campaign December 2008


Flutua observational campaign may 2002
FluTuAObservational campaign May 2002


References1
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


Surface emissivity
Surface Emissivity

ε = 0.97

ε = 0.97 Surface emissivity













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