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NADIR MURI IV. Wave forcing from the lower atmosphere

NADIR MURI IV. Wave forcing from the lower atmosphere. IDEA/WAM model development and first results (R. Akmaev, F. Wu, H. Wang, and T. Fuller-Rowell) Seasonal density variations in NCAR TIE-GCM (S. Solomon and L. Qian). Motivation: density variability.

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NADIR MURI IV. Wave forcing from the lower atmosphere

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  1. NADIR MURIIV. Wave forcing from the lower atmosphere IDEA/WAM model development and first results (R. Akmaev, F. Wu, H. Wang, and T. Fuller-Rowell) Seasonal density variations in NCAR TIE-GCM (S. Solomon and L. Qian)

  2. Motivation: density variability Temperature correction (dTc) to empirical J70 model from 4 satellite orbits in 2002 compared to solar and geomagnetic indices. Significant spectral peaks near 11, 14, and 19 days are a possible manifestation of PW effects. (Courtesy B. Bowman, 2006)

  3. Whole Atmosphere Model (WAM) Global Ionosphere-Plasmasphere (GIP) Model Column Physics Plasma Physics Surface Physics WAM/GIP Interface Ui, Vi, & ni Ni, J, & Jp Spherical/Hybrid Coordinate System Magnetic Apex Flux-Tube Coordinate System U, V, & T O, O2, & N2 Neutral Dynamical Spectral Core Plasma Dynamics & Electrodynamics Coupled model of Integrated Dynamics through Earth’s Atmosphere (IDEA)

  4. WAM = Extended GFS + Physics Operational Global Forecast System T382L64 (~ 0.30.3, ~ 0 – 62 km) Hydrology, surface exchange processes, ozone transport, radiation, cloud physics, etc. 4 forecasts daily Ensemble (14 members) forecast up to 16 days WAM 150 layers (~ 0 – 600 km)  ρS/ρT ~ 1013 Variable composition  thermodynamics Column + surface physics Timing: ~ 8 min/day on 32 nodes @ T62L150

  5. Validation: DW1 T tide @ 100 km TIMED/SABER data (Forbes et al., 2008)

  6. Validation: SW2 T tide @ 100 km TIMED/SABER data (Forbes et al., 2008)

  7. Validation: DE3 T tide @ 116 km TIMED/SABER data (Forbes et al., 2008)

  8. Validation: DE3 U tide @ 95 km UARS/HRDI&WINDII TIMED/TIDI UARS data (Forbes et al., 2003), TIMED data (Oberheide et al., 2006)

  9. Tidal variability: T (m = 3) The presence of migrating and nonmigrating tides modulated at scales of several days in the lower thermosphere (E-layer dynamo) region is evident

  10. Density variability: time series High-pass one-year WAM simulation shows residual variability of global mean density on short time scales

  11. Density variability: wavelet spectrum Global mean density shows variability (events) on scales from daily to intraseasonal

  12. Density variability: wavelet spectrum Density at 300 km Period (days) Day number Global mean density shows variability (events) on scales from daily to intraseasonal

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