Quick reminder : general equations

(see yesterday's presentation by F. Hourdin)

transport Coriolis gravity

Sources

BL scheme

A, B, K

Soil scheme

Evaporation

q1, q2, q3, . . . . ,qn (time t + dt)

q1, q2, q3, . . . . ,qn (time t)

BL scheme

Entrainment

Detrainment

LNB

LCL

Unsaturateddowndraught

Emanuel scheme

Mixed saturateddraughts

Adiabatic ascent

Orography

PBL

Shallowconvection

ALE,oro,therm

ALP,oro,dyn

ALP

ALE

Q1

ALE

ALP

Deepconvection

DensityCurrents

Mali, August 2004F. Guichard, L. Kergoat

Cold poolDensity currentWake

Gust front

Lifting

Convective column

Anvil

Wake

Precipitating Downdraught

Lifting

Simulated wake propertiesHAPEX92: 21 Aug 1992 squall line case

TOGA-COARE: 22 Feb 1993 squall line case

z

T

q

In a model column there are structures of boundary layer scale

20 km

“The Thermal Model”:Each column is split in two parts:Ascending air from the surface and subsiding air around it.

The model represents a mean plume (the thermal) and a mean cloud.

200 km

3 km

e

d

w

Etc ...

Updraught Slow compensating subsidence

Turbulent Diffusion

Transport by the thermal plume model

In the model, this would be (- sens)