How well do three GCMs capture the present climate ? AF 07
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Transcript of How well do three GCMs capture the present climate ? AF 07
How well do three GCMs capture the present climate ?
AF 07
GCM data:
single control runs for
i) ECHAM4 1971-2000
ii) CSIRO9 Mk II 1961-1991
iii) HadAM3 1960-1990
Reanalysis data ("observations"):
i) NCEP 1970-2002
ii) ERA 1979-1993
JJA climatology
sea level pressure
Obs 1
HadAM
CSIRO
ECHAM
Obs 2
DJF climatology
sea level pressure
Obs 1
Obs 2HadAM
CSIRO
ECHAM
JJA climatology
integrated moisture
Obs 1
Obs 2HadAM
CSIRO
ECHAM
DJF climatology
integrated moisture
Obs 1
Obs 2HadAM
CSIRO
ECHAM
JJA 500hPa height
deviation from annual mean
Obs 1
Obs 2HadAM
CSIRO
ECHAM
DJF 500hPa height
deviation from annual mean
Obs 1
Obs 2HadAM
CSIRO
ECHAM
JJA climatology 700 hPa wind
OBS
CSIRO
HadAM
ECHAM
DJF climatology 700 hPa wind
OBS
CSIRO
HadAM
ECHAM
Walker circulation 5S - 5N (DJF)
OBS HadAM
ECHAM CSIRO
Summary
i) Any GCM data used for climate change assessment should be validated over the region of interest.
ii) Temporal and spatial biases should be understood and accounted for where necessary.
iii) Single pixel values should be avoided and aggregations at the skill level of the GCM used.