AMWG Variability Diagnostics for Daily Data


Intraseasonal Variability

Daily 200 hPa velocity potential anomalies computed and then averaged
over 5S-5N, 20-70 day bandpass filter then applied. Hovmöller plots.
Bandpass filter response plot

SILHS_10sc_NoZM_12-10. Anomalies are relative to the 0000-0006 mean.
0-1
2-3
4-5

Anomalies computed relative to the time period mean.
NCEP Reanalysis CAM3 Amip (T85)
1981-1982 1981-1982
1983-1984 1983-1984
1985-1986 1985-1986
1987-1988 1987-1988
1989-1990 1989-1990
1991-1992 1991-1992
1993-1994 1993-1994
1995-1996
1997-1998
1999-2000

Madden-Julian Oscillation

Time series of daily 200 hPa zonal wind averaged over 10N-10S.
200 hPa zonal wind bandpass filtered for 20-100 day period.
MJO Index defined as the running variance of the bandpass filtered data.
SILHS_10sc_NoZM_12-10
NCEP Reanalysis
CAM3 Amip (T85)

Histograms

Histograms of daily precipitation rate for the Tropics and NH Extratropics.
SILHS_10sc_NoZM_12-10
NCEP Reanalysis
CAM3 Amip (T85)