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Modeling the Upper Atmosphere and Ionosphere with TIMEGCM

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Presentation on theme: "Modeling the Upper Atmosphere and Ionosphere with TIMEGCM"— Presentation transcript:

1 Modeling the Upper Atmosphere and Ionosphere with TIMEGCM
Geoff Crowley Atmospheric & Space Technology Research Associates (ASTRA) TIMEGCM: Thermosphere-Ionosphere-Mesosphere-Electrodynamics-General Circulation Model ASPEN: Advanced SPace ENvironment Model

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3 ASPEN-TIMEGCM

4 Simulating Mars and Earth
Temperatures, Chemistry & Winds

5 Think I’ll develop another GCM this afternoon
So it’s Easy …….. Right? Think I’ll develop another GCM this afternoon

6 Simplified Physics of Upper Atmosphere
Joule Heating Particle Heating Solar EUV Chemical Heating Tides Gravity Waves Composition Temperature Winds E-fields Electron Density Boundary Conds Diffusion Coeffs Chemistry Solar EUV

7 Important Inputs to the Thermosphere – Ionosphere System
Solar EUV Input OUTPUT High Latitude Inputs E-fields Particles Neutral density Composition Temperature Wind Electron density Dynamo E-fields Coupled Thermosphere –Ionosphere-Electrodynamics Tides and Gravity Waves

8 MODEL - %DIFFERENCE (Storm – Quiet)
MODEL - QUIET - 12UT Neutral Temperature 12 UT MODEL - %DIFFERENCE (Storm – Quiet) MODEL - STORM - 12UT

9 MODEL - %DIFFERENCE (Storm – Quiet)
MODEL - QUIET - 12UT Meridional Wind 12 UT MODEL - %DIFFERENCE (Storm – Quiet) MODEL - STORM - 12UT

10 Most Realistic High Latitude Inputs
Data Inputs: 180 magnetometers 3 DMSP satellites X SuperDARNs

11 Time runs right to left TIMEGCM+AMIE 325 (11/21) 324 (11/20)
323 (11/19) 322 (11/18) 325 (11/21) 324 (11/20) 323 (11/19) 322 (11/18) Time runs right to left 325 (11/21) 325 (11/21) 324 (11/20) 324 (11/20) 323 (11/19) 323 (11/19) 322 (11/18) 322 (11/18) 325 (11/21) 324 (11/20) 323 (11/19) 322 (11/18) TIMEGCM+AMIE

12 Vertical Coordinate System
If Zp is the pressure level (usually ranging from –17 to +5), and Po is the base pressure P = Po exp (-Zp) (ASPEN has 88 pressure levels; 30 to 600 km) Density is r = Po exp (-Zp) Mbar / (Kb T), where Kb is the Boltzman constant (gas constant / Avogadro number). Units depend on the choice of Po and Kb. If Kb = 1.38e-16 erg/K then density is in g/cm3. Horizontal Coordinates -87.5S (5) +87.5N latitude ; -180E (5) +180E longitude (72*36 grid points)

13 Energy equation Many terms
Molecular conduction radiation advection adiab. heating The leap-frog method is employed with vertical thermal conductivity treated implicitly to second order accuracy. This leads to a tridiagonal scheme requiring boundary conditions at the top and bottom of the domain as implied by the differential equation. Advection is treated implicitly to fourth order in the horizontal, second order in the vertical

14 Heating Terms Cooling Terms Dynamical terms
QEUV EUV ( Å) (EUVEFF= 5%) QSRC O2 -Schumann-Runge continuum ( Å) QSRB O2 -Schumann-Runge bands ( Å) QO3 O3- Lyman a ( Å) O3- Hartley, Huggins and Chappuis ( nm) QO2 O2- Lyman a ( Å) O2 Herzberg ( Å) QNC Exothermic neutral-neutral chemistry (NOX, HOX, OX, CH4, O(1D) quench, CLX) Atomic O recombination Heating from O(1D) quenching QIC Exothermic ion-neutral chemistry QA Non-Maxwellian auroral electrons (AUREFF= 5%) QP Photoelectrons (X-rays, EUV, and Night) (EFF=5%) QEI Collisions between e-, ions and neutrals QDH 4th order diffusion heating QGW Gravity Waves QM Viscous Dissipation QJ Joule heating QT Total Heating Cooling Terms O(3P) 63 mm O(3P) fine structure NO mm Nitric Oxide CO mm Carbon Dioxide O mm Ozone Km Molecular Conduction DIFKT Eddy Diffusion Cooling Dynamical terms Adiabatic cooling Horizontal Advection Vertical Advection

15 NEUTRAL GAS HEATING

16 Global Mean Heating and Cooling Terms (Solar Min.)
Figure 2. Diurnal global mean deg K/day a) f) e) d) c) b) Global Mean Heating and Cooling Terms (Solar Min.) 275 km 150 150 120 103 90 90 50 Neutral Temperature Heating (K/day) Cooling (K/day) Heating (K/day) Cooling (K/day)

17 Effect of Season On Heating (SMAX)
Equinox Solstice

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20 Continuity equation molecular diffusion eddy diffusion Horiz. advection Vert. adv. Production Recombination The leap-frog method is employed leading to a tridiagonal scheme requiring boundary conditions at the top and bottom of the domain.

21 Nitrogen Chemistry (Simplified for This Talk)
Each species equation includes horizontal and vertical advection, photo-chemical production and loss, and vertical molecular and eddy diffusion.

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23 Neutral Species The model includes 15 separate neutral species, not counting some excited states which are also tracked. O, N2, O2, CO2, CO, O3, H, H2, H2O, HO2, N, NO, NO2, Ar, and He. Ionized Species The model includes 6 ion species O+, N+, O2+, N2+, NO+, and H+ with ionization primarily from solar EUV and x-rays, together with auroral particles.

24 Momentum equations Zonal velocity Meridional velocity Coriolis
Rayleigh friction Coriolis Pressure gradients gravity wave drag ion drag Viscosity (Molecular and Eddy) momentum advection Meridional velocity The Leap frog method is employed with vertical molecular viscosity treated implicitly to second order accuracy. Since the zonal and meridional momentum equations are coupled through Coriolis and off-diagonal ion drag terms, the system reduces to a diagonal block matrix scheme, where (2 x 2) matrices and two component vectors are used at each level. Boundary conditions for the zonal (u) and meridional ( v) wind components are needed at the top and bottom of the model.

25 Momentum Forcing Terms
(u,v) = neutral velocity (cm/s) (ui, vi) = ion velocity (cm/s) Pressure gradients f = 2 W sin(colatitude) (s-1) part of Coriolis forcing Molecular viscosity = Km (g/cm/s) Eddy viscosity (vertical) = DIFKV (g/cm/s) Momentum advection GWU, GWV = gravity wave drag RAYK = Rayleigh friction lij = ion drag tensor (must have units of s-1)

26 Balance of Forces

27 NUMERICAL EXPERIMENTS
b) NUMERICAL EXPERIMENTS Electric Potential c) d) Electron Density

28 Conjugate Enhancements

29 MODEL COUPLING #1 ASPEN-IDA3D-AMIE (AIA)
Self-consistently coupled - each output feeding the input of the other. Each algorithm has strengths that address the weaknesses of others. Coupled together, a more accurate specification of ionosphere and thermospheric state variables is obtained. Output: complete, data-driven specification (and prediction) of ionospheric and thermospheric state variables. Particularly: High latitude conductances High latitude field aligned currents (FAI) High latitude potentials High latitude Joule heating Global Electron density, neutral winds, neutral composition etc. AMIE TIMEGCM IDA4D Ne Background Ne , Q, E TIMEGCM-IDA3D-AMIE interaction  FAC

30 EFFECT OF ADDING IDA4D ELECTRON DENSITY TO TGCM NEUTRALS
50 SH GUVI Raw GUVI Binned ASPEN IDA3D/ASPEN AMIE Figure 4. Comparisons of Hall Conductance from GUVI, ASPEN, IDA3D/ASPEN, and AMIE for November 20, 2003 for GUVI orbit (~17:29 UT) in apex magnetic latitude and magnetic local time coordinates.

31 Conductance Affects Field Aligned Currents from AMIE

32 SAMI3 (ionos-plasmasphere) RCM (inner magnetosphere)
MODEL COUPLING #2 Extension to Plasmasphere/Inner Magnetos. SAMI3 (ionos-plasmasphere) RCM (inner magnetosphere) TIMEGCM

33 SAMI3 (ionos-plasmasphere) RCM (inner magnetosphere)
MODEL COUPLING #3 Addition of Hydrogen Geocorona SAMI3 (ionos-plasmasphere) RCM (inner magnetosphere) Hydrogen Geocorona (2-4 RE) TIMEGCM

34 SAMI3 (ionos-plasmasphere) RCM (inner magnetosphere)
MODEL COUPLING #4 Coupling to Lower Atmosphere?? SAMI3 (ionos-plasmasphere) RCM (inner magnetosphere) Hydrogen Geocorona (2-4 RE) TIMEGCM NOGAPS NCEP

35 How to Think About About Upper Atmosphere GCMs
They are numerical laboratories Can do controlled (numerical) experiments They approximate reality Good “first stop” for atmospheric predictions Useful framework for understanding a system Useful framework for data analysis, and can be studied for mechanisms Useful place to test ideas (what if …..) Necessary first step to space-weather forecasting

36 Summary Thermosphere-Ionosphere-Mesosphere-Electrodynamics-General Circulation Model km Fully coupled thermodynamics, chemistry Inputs - tidal, solar, high latitude Outputs Neutral: Temp, Wind, Density, Composition Ionosphere: Electron density, ions (dynamo E-field) Extensively Validated Various model coupling studies Provides useful background fields and test-bed e.g. gravity wave propagation

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