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The Canadian Centre for Climate Modelling and Analysis (CCCMA) has
developed several climate simulation models for use in projecting
natural climate change and assessing the impact of human activities
on climate change. CCCMA's first-generation global coupled model
(CGCM1) was run with three scenarios: one with constant atmospheric
forcing (control run), one with carbon dioxide (CO2) increasing at a
compounded one percent per year rate, and one with a combination of
CO2 and sulfate aerosol concentrations.
The model was run at T32 resolution, resulting in a 97 by 48
gaussian latitude/longitude grid with approximately 3.75 degree by
3.75 degree resolution. Daily (once- or twice-daily depending on the
parameter) and monthly output grids were produced. Upper level
(850mb and 500mb) parameters include geopotential heights,
temperature, winds, and humidity. At the surface, the model outputs
include temperature, wind, humidity, pressure, sea-level pressure,
precipitation, and radiation fluxes.
DSS has used the monthly-mean grids to compute decadal means for
years zero through nine (e.g. 2000-2009) for each decade. DSS also
computed smoothed decadal means which are 30-year running means of
the raw decadal means. Because of the large variability in the
decadal means of parameters such as precipitation, it is recommended
that the smoothed decadal-mean grids be used and applied to the
middle decade of the period (e.g. apply the 2000-2029 mean to the
year 2015).
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