CAM Variability Test Plots

## AMWG Variability Diagnostics for 6-Hourly Data

### Wavenumber-Frequency Power Spectra

Zonal wavenumber-frequency logarithm of power spectra calculated from 06Z and
18Z data (summed 15S to 15N) of anti-symmetric and symmetric components of data.

Fortran code for computing the space-time spectra and the observed OLR dataset
supplied by Matthew Wheeler. See Wheeler and Kiladis, JAS, vol 56, 374-399, 1999.

The observed OLR data is from NOAA polar-orbiting satellites and covers
the period 1979-2000. The CAM3 Amip (t42) and NCEP Reanalysis data are for the
period 1991-2000.

OLR (outgoing LW radiation) | CAM5.control.FAMIPC5.f19.1990-2005.MJO | NOAA | NCEP | CAM3 Amip (T42)
--- | --- | --- | --- | ---
Anti-symmetric raw power spectra (WK99 Fig. 1a) | plot | plot | plot | plot
Symmetric raw power spectra (WK99 Fig. 1b) | plot | plot | plot | plot
Background power spectra (WK99 Fig. 2) | plot | plot | plot | plot
Anti-symmetric/background power spectra (WK99 Fig. 3a) | plot | plot | plot | plot
Symmetric/background power spectra (WK99 Fig. 3b) | plot | plot | plot | plot

U200 (200 mb zonal wind) | CAM5.control.FAMIPC5.f19.1990-2005.MJO | NCEP | CAM3 Amip (T42)
--- | --- | --- | ---
Anti-symmetric raw power spectra (WK99 Fig. 1a) | plot | plot | plot
Symmetric raw power spectra (WK99 Fig. 1b) | plot | plot | plot
Background power spectra (WK99 Fig. 2) | plot | plot | plot
Anti-symmetric/background power spectra (WK99 Fig. 3a) | plot | plot | plot
Symmetric/background power spectra (WK99 Fig. 3b) | plot | plot | plot

U850 (850 mb zonal wind) | CAM5.control.FAMIPC5.f19.1990-2005.MJO | NCEP | CAM3 Amip (T42)
--- | --- | --- | ---
Anti-symmetric raw power spectra (WK99 Fig. 1a) | plot | plot | plot
Symmetric raw power spectra (WK99 Fig. 1b) | plot | plot | plot
Background power spectra (WK99 Fig. 2) | plot | plot | plot
Anti-symmetric/background power spectra (WK99 Fig. 3a) | plot | plot | plot
Symmetric/background power spectra (WK99 Fig. 3b) | plot | plot | plot

PRECT (precipitation rate) | CAM5.control.FAMIPC5.f19.1990-2005.MJO | NCEP | CAM3 Amip (T42)
--- | --- | --- | ---
Anti-symmetric raw power spectra (WK99 Fig. 1a) | plot | plot | plot
Symmetric raw power spectra (WK99 Fig. 1b) | plot | plot | plot
Background power spectra (WK99 Fig. 2) | plot | plot | plot
Anti-symmetric/background power spectra (WK99 Fig. 3a) | plot | plot | plot
Symmetric/background power spectra (WK99 Fig. 3b) | plot | plot | plot

OMEGA500 (500 mb vertical velocity) | CAM5.control.FAMIPC5.f19.1990-2005.MJO | NCEP | CAM3 Amip (T42)
--- | --- | --- | ---
Anti-symmetric raw power spectra (WK99 Fig. 1a) | plot | plot | plot
Symmetric raw power spectra (WK99 Fig. 1b) | plot | plot | plot
Background power spectra (WK99 Fig. 2) | plot | plot | plot
Anti-symmetric/background power spectra (WK99 Fig. 3a) | plot | plot | plot
Symmetric/background power spectra (WK99 Fig. 3b) | plot | plot | plot