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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

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)


Motivation density variability
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)


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)


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


Validation: DW1 T tide @ 100 km

TIMED/SABER data (Forbes et al., 2008)


Validation: SW2 T tide @ 100 km

TIMED/SABER data (Forbes et al., 2008)


Validation: DE3 T tide @ 116 km

TIMED/SABER data (Forbes et al., 2008)


Validation: DE3 U tide @ 95 km

UARS/HRDI&WINDII

TIMED/TIDI

UARS data (Forbes et al., 2003), TIMED data (Oberheide et al., 2006)


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


Density variability: time series

High-pass one-year WAM simulation shows residual variability of global mean density on short time scales


Density variability: wavelet spectrum

Global mean density shows variability (events) on scales from daily to intraseasonal


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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