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) b.e15.B1850.f09_g16.pi_control.all.119.hf 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) b.e15.B1850.f09_g16.pi_control.all.119.hf 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) b.e15.B1850.f09_g16.pi_control.all.119.hf 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) b.e15.B1850.f09_g16.pi_control.all.119.hf TRMM (lat-lon 1-degree) 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) b.e15.B1850.f09_g16.pi_control.all.119.hf 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

Hovmöller Plots over Wide Tropics 15S-15N

OLR:

b.e15.B1850.f09_g16.pi_control.all.119.hf 1-2 3-4 5-6 7-8 9-10

NCEP reanalysis 1980-1981 1982-1983 1984-1985 1986-1987 1988-1989 1990-1991 1992-1993 1994-1995 1996-1997 1998-1999 2000-2001 2002-2003 2004-2005

OLR ANOMALIES:

b.e15.B1850.f09_g16.pi_control.all.119.hf 1-2 3-4 5-6 7-8 9-10

NCEP reanalysis 1980-1981 1982-1983 1984-1985 1986-1987 1988-1989 1990-1991 1992-1993 1994-1995 1996-1997 1998-1999 2000-2001 2002-2003 2004-2005

U200:

b.e15.B1850.f09_g16.pi_control.all.119.hf 1-2 3-4 5-6 7-8 9-10

NCEP reanalysis 1980-1981 1982-1983 1984-1985 1986-1987 1988-1989 1990-1991 1992-1993 1994-1995 1996-1997 1998-1999 2000-2001 2002-2003 2004-2005

U200 ANOMALIES:

b.e15.B1850.f09_g16.pi_control.all.119.hf 1-2 3-4 5-6 7-8 9-10

NCEP reanalysis 1980-1981 1982-1983 1984-1985 1986-1987 1988-1989 1990-1991 1992-1993 1994-1995 1996-1997 1998-1999 2000-2001 2002-2003 2004-2005

U850:

b.e15.B1850.f09_g16.pi_control.all.119.hf 1-2 3-4 5-6 7-8 9-10

NCEP reanalysis 1980-1981 1982-1983 1984-1985 1986-1987 1988-1989 1990-1991 1992-1993 1994-1995 1996-1997 1998-1999 2000-2001 2002-2003 2004-2005

U850 ANOMALIES:

b.e15.B1850.f09_g16.pi_control.all.119.hf 1-2 3-4 5-6 7-8 9-10

NCEP reanalysis 1980-1981 1982-1983 1984-1985 1986-1987 1988-1989 1990-1991 1992-1993 1994-1995 1996-1997 1998-1999 2000-2001 2002-2003 2004-2005