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Han-Li Liu, Raymond G. Roble, Arthur D. Richmond, Stanley C

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Presentation on theme: "Han-Li Liu, Raymond G. Roble, Arthur D. Richmond, Stanley C"— Presentation transcript:

1 Thermosphere and Ionosphere Extension of the Whole Atmosphere Community Climate Model
Han-Li Liu, Raymond G. Roble, Arthur D. Richmond, Stanley C. Solomon, Maura E. Hagan, Astrid Maute, Liying Qian High Altitude Observatory Rolando R. Garcia, Daniel R. Marsh, Douglas E. Kinnison, Anne K. Smith Atmospheric Chemistry Division Byron A. Boville, Fabrizio Sassi Climate and Global Dynamics Division Earth and Sun Systems Laboratory National Center for Atmospheric Research

2 Extension of WACCM to the Thermosphere and Ionosphere
Model Framework Chemistry Physics Resolution Horizontal: 1.9° x 2.5° or 4.0° x 5.0° (lat x lon) Vertical: 81 levels 0-~500km < 1.0km in Upper Troposphere/ Lower Stratosphere 1-2 km in strat. 0.5 scale height in mesosphere/ thermosphere (can be reconfigured as needed) Extension of the NCAR Community Atmosphere Model V.3 (CAM3) Finite Volume Dynamical Core MOZART+ Ion Chemistry (52 neutral+5 ions+electron) Fully-interactive with dynamics. Long wave/short wave/EUV IR cooling (LTE/non-LTE) Major/minor species diffusion Species dependent Cp, R, m. Parameterized electric field at high, mid, low latitudes. IGRF geomagnetic field. Auroral processes, ion drag and Joule heating Parameterized GW (including thermosphere) Ambipolar diffusion Ion/electron transport due to Lorentz force Ion/electron energy equations Ionospheric dynamo Coupling with plasmasphere/magnetosphere Green: Thermosphere extension. Red: Ionosphere extension.

3 WACCM: Compositional Structures
Major Species Ions and Electrons Roble, 1995

4

5 WACCM: Winds and Temperature (December)

6 WACCM: Winds and Temperature (March)

7 Thermosphere Semi-annual Variation
WACCM MSIS 1.73E-5Pa ~250 km 120km Compare 250km results Compare 120km Thermospheric variability 120 km (Courtesy Fuller-Rowell, 1998)

8 Short-term Variability
Why is MLT an interesting region: interface between the lower atmosphere and thermosphere. Complex variability from both regions.

9

10 Summary and Future Studies
The extended WACCM reproduces salient features of Atmospheric composition, temperature and wind of the whole atmosphere. Semi-annual variation in the thermosphere. Tides Migrating components: weaker than observed. Test with higher vertical resolution (.25 scale height) yields results in good agreement with observations. E3 diurnal--comparable to observed. Further analysis of thermospheric variability as related to the coupling with the lower atmosphere. Further development to include ionospheric electrodynamics. We would like to report that the extended WACCM is up and running now. What’s being planed?

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