For each CSIRO Mk3.0 gridcell: A 12-month average temperature was
calculated for 1961-1990 based on the simulated transient historical
data. Result is a 12 month simulated climatology at the scale of the
CSIRO Mk3.0 grid.
For each forecast month a difference anomaly was calculated (ex.
January_2021 – Mean_historical_January). Result is a 100 year
monthly set of temperature anomalies at the scale of the CSIRO Mk3.0 grid.
For each forecast month: Gridded anomalies were interpolated to a
½ degree grid using a bilinear interpolation. For each forecast
month and each ½ degree gridcell: The anomaly for that month is
added to the CRU historical mean temperature (ex.
CRU_Mean_January_1961-1990 + January_2021_anomaly). Result is mean
monthly temperature data for the years 2001-2100 at the ½
degree grid.
An average of the years 2070-2099 was produced. Result is a single
map of the average temperature values.