Physics - Dynamics Interface The 14th ALADIN Workshop Innsbruck, 1-4 June 2004 Martina Tudor Meteorological and Hydrological Service, Grič 3, HR- 10000.

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Presentation transcript:

Physics - Dynamics Interface The 14th ALADIN Workshop Innsbruck, 1-4 June 2004 Martina Tudor Meteorological and Hydrological Service, Grič 3, HR Zagreb, Croatia

Physics - dynamics interface general considerations mass conservation issues AROME equations predictor - corrector scheme

General considerations total tendency is a sum of the linear contribution from dynamics, the non-linear part of the dynamics and the physics part we compute the physics tendency before the dynamical one and interpolate it to the origin point

Mass conservation In ALADIN/ARPEGE, two options exist: (1) the total mass of the atmosphere is conserved (NDPSFI=0 in NAMPHY) (2) the mass of the dry air is conserved (NDPSFI=1) –is a prognostic variable

(1) When the total mass of the atmosphere is conserved the mass of water removed from the atmosphere is replaced by the dry air the mass of water vapour evaporated from the bottom surface (or falling precipitation) is compensated by a removal of the dry air dry air prec. flux water vapour dry air

(2) When the mass of the dry air is conserved the total mass of the atmosphere changes due to the precipitation - evaporation budget condensation produces a local mass deficit evaporation produces a local mass increase prec. flux water vapour evaporation of precipitation

(2) When the mass of the dry air is conserved (2) prec. flux water vapour prec. flux water vapour dry air dry air advection qE (1-q)E turbulence (1-q)E -(1-q)E

Equations Impact of the variable mass assumption on the evolution of the model variables horisontal wind vertical velocity temperature moisture

Vertical co-ordinate in the case of condensation, and precipitation we have a removal of mass here but this precipitation may evaporate on the way to the ground so we have extra mass here we get vertical velocity due to a mass flux due to precipitation-evaporation budget cloud

Arome

snow rain Barycentric velocity velocities of the different atmospheric constituents cloud water and ice dry air

Arome - Conservation of species The conservation equation for the species k is species: dry air, water vapour, liquid water, cloud ice, rain, snow and graupel.

Arome - Velocity equation

Arome - Enthalpy equation The evolution equation for enthalpy is

Arome - Temperature equation The evolution equation for temperature is

Aladin all the non-precipitating species move with the same speed mass and volume of precipitation is neglected velocity of precipitation is infinite we define the product of mass to the velocity of precipitation as where P is a precipitation flux

Aladin - barycentric velocity with the Aladin assumptions, the barycentric velocity is

Aladin - barycentric velocity (2)

Aladin - barycentric velocity (3)

Aladin - Continuity equation The continuity equation becomes

Aladin - Conservation of water species

Aladin - Velocity equation

Aladin - Temperature equation

Aladin - Temperature equation (2)

Aladin - Temperature equation (3)

PC scheme The way it is coded now but, Under LPC_FULL, the position of the O points is recomputed and the values are re-interpolated.

And a few figures Stratiform precipitation woth 5 km resolution over Alps, August 10th 2002.

Conclusion both options for the mass conservation assumptions may be kept