Mid 21st Century Global Temperature Projection Data

Source: R/bang-package.R

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).

temp1

Format

A data frame with 270 rows and 4 columns.

  • Column 1, index: anomaly of 2020-2049 mean relative to the 1970-1999 mean.

  • Column 2, GCM: Abbreviated name of General Circulation Model.

  • Column 3, RCP: Representative Concentration Pathway. One of rcp26, rcp45, rcp60, rcp85.

  • Column 4, run: Simulation run number.

Source

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.

Details

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). Use 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 rcpxx where xx is a radiative forcing level resulting from an anticipated future greenhouse gas emissions. Column 4 is the simulation run number.

References

Northrop, P.J. and R.E. Chandler (2014). Quantifying Sources of Uncertainty in Projections of Future Climate. Journal of Climate, 27, 8793-8808. doi: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. doi:10.1007/s10584-011-0148-z