Indices of global temperature change from late 20th century (1970-1999) to mid 21st century (2020-2049) based on data produced by the Fifth Coupled Model Intercomparison Project (CMIP5).
A data frame with 270 rows and 4 columns.
index: anomaly of 2020-2049 mean relative to
the 1970-1999 mean.
GCM: Abbreviated name of General Circulation
RCP: Representative Concentration Pathway.
One of rcp26, rcp45, rcp60, rcp85.
run: Simulation run number.
The data frame
temp1 data frame has 270 rows and 4 columns.
Each row relates to a climate projection run from one of 38 different
General Circulation Models (GCMs) under a particular
Representative Concentration Pathway (RCP).
table(temp1[, c("GCM", "RCP")]) to see the numbers of
runs under each RCP for each GCM.
See Van Vuuren et al (2011) for an overview of RCPs
and Northrop and Chandler (2014) for analyses of a similar
older dataset (CMIP3).
Column 1 contains the anomaly of the mean global temperature over
the time period 2020-2049 relative to the mean global temperature
over 1970-1999, i.e. the latter subtracted from the former.
Column 2 contains an abbreviation for the name of the climate modelling
research group and the GCM.
Column 3 contains the RCP in the format
is a radiative forcing level resulting from an anticipated future
greenhouse gas emissions.
Column 4 is the simulation run number.
The raw data from which the indices are calculated are monthly CMIP5 scenario runs for global surface air temperature (tas) downloaded from the KNMI Climate Explorer (https://climexp.knmi.nl/) on 4/3/2015.
Northrop, P.J. and R.E. Chandler (2014). Quantifying Sources of Uncertainty in Projections of Future Climate. Journal of Climate, 27, 8793-8808. https://doi.org/10.1175/JCLI-D-14-00265.1
Van Vuuren, D. P., Edmonds, J., Kainuma, M., Riahi, K. Thomson, A., Hibbard, K., Hurtt, G. C., Kram, T., Krey, V., Lamarque, J.-F. (2011). The representative concentration pathways: an overview. Climatic change, 109, 5-31. https://doi.org/10.1007/s10584-011-0148-z
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