Presentation Slides for Chapter 7 of Fundamentals of Atmospheric Modeling 2 nd Edition Mark Z. Jacobson Department of Civil & Environmental Engineering.

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Presentation transcript:

Presentation Slides for Chapter 7 of Fundamentals of Atmospheric Modeling 2 nd Edition Mark Z. Jacobson Department of Civil & Environmental Engineering Stanford University Stanford, CA March 10, 2005

Vertical Model Grid Fig. 7.1

Estimate top altitude in test column (7.2) z below is altitude from App. Table B.1 just below p a,top Estimating Sigma Levels Estimate altitude at bottom of each layer in test column (7.3) Find pressure from (2.41) --> sigma values (7.4) Estimate pressure at each layer edge (2.41)

Estimating Sigma Levels Sigma values (7.4) Model pressure at bottom boundary of layer (7.6) Model column pressure (7.5) Sigma thickness of layer (7.1)

Layer Midpoint Pressure Pressure at the mass-center of a layer (7.7)

Pressure where mass-weighted mean of P is located (7.10) When  v increases monotonically with height Layer Midpoint Pressure Mass-weighed mean of P (7.8) Value of P at boundaries (7.9) Consistent formula for  v at boundaries (7.11)

Arakawa C Grid Fig. 7.2

Prognostic equation for column pressure (7.12) Continuity Equation For Air First-order in time, second-order in space approx. (7.13)

Horizontal fluxes in domain interior (7.15) Prognostic Column Pressure

Horizontal fluxes at eastern and northern boundaries (7.17) Equation for column pressure (7.14)

Diagnostic equation for vertical velocity (7.19) Diagnostic Vertical Velocity Finite difference equation (7.20)

Diagnostic Vertical Velocity Substitute fluxes and rearrange --> vertical velocity (7.21)

Species continuity equation (7.22) Species Continuity Equation Finite-difference form (7.23)

Substitute fluxes --> final continuity equation (7.24) Species Continuity Equation Mixing ratios at vertical top and bottom of layer (7.25)

Thermodynamic Energy Equation Continuous form (7.26) Final finite difference form (7.27)

Conservation Kinetic energy (7.28) Absolute vorticity (7.29) Enstrophy (7.30) Fig. 7.3 Relative error

West-East Momentum Equation Fig. 7.4

West-East Momentum Equation Continuous form (7.31)

West-East Momentum Equation Time-difference term(7.32)

West-East Momentum Equation Column pressure multiplied by grid-cell area at u-point(7.38) Grid-cell area (7.39)

West-East Momentum Equation Horizontal advection terms(7.33)

West-East Momentum Equation Interpolations for fluxes( )

West-East Momentum Equation Vertical transport of horizontal momentum(7.34) U-values at bottom of layer(7.45)

West-East Momentum Equation Interpolation for vertical velocity term (7.40)

West-East Momentum Equation Coriolis and spherical grid conversion terms(7.35)

West-East Momentum Equation Pressure gradient terms(7.36)

West-East Momentum Equation Boundary conditions for pressure-gradient term(7.46)

West-East Momentum Equation Eddy diffusion terms (7.37)

South-North Momentum Equation Fig. 7.5

Vertical Momentum Equation Hydrostatic equation Geopotential at vertical center of bottom layer (7.61) Geopotential at bottom of subsequent layers (7.62) Geopotential at vertical midpoint of subsequent layers (7.63)

Time-Stepping Schemes Matsuno scheme(7.65-6) Explicit forward difference to estimate final value followed by second forward difference to obtain final value Time derivative of an advected species (7.64) Leapfrog scheme(7.67) Fig. 7.6