AMWG Variability Diagnostics for 6-Hourly Data
Wavenumber-Frequency Power Spectra
Zonal wavenumber-frequency logarithm of power spectra calculated from 06Z and18Z 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) | spcam30_4km_32c | 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) | spcam30_4km_32c | 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) | spcam30_4km_32c | 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) | spcam30_4km_32c | 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) | spcam30_4km_32c | 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 |
