Institute for Mathematics Applied to Geosciences (IMAGe)

 

Simulated Spring temperatures 850AD.

Climate model output to simulate climate for the last 1000 years

Doug Nychka email: nychka "at" ucar "dot" edu

These data form the basis for investigating the long term variability in the Earth's climate system for the past 1000 years.

Data sets

Download

The R datasets and supporting functions are contained in the R binary format file NAtemp.bin (6.2Mb). Just download this file -- don't let your browser try to display it!

Data source and construction

The historical correspondence of this simulation as mainly tied to the setting the solar radiation, volcanic activity and carbon dioxide levels to the estimates at these times. These external drivers of the climate system are known as forcings. The annual series used for these simulations are listed in text format in the files:

Original model output proived by Caspar Ammann and is in the moderately large (243Mb) netcdf file TREFHT.sd.b056.82.0850-1999.nc. Create.NAtemp.R is the R script used to process this original output file into an R data set format.


Some examples in R

These examples use the fields R package.

Load the fields library and the data set in R binary format:

library(fields)
attach("NAtemp.bin") 

Image plot of spring 850, the first time point ( timeNA is 850.25) with world map added.

image.plot( lonNA, latNA, NAtemp[,,1])
world ( add=TRUE)

Time series of first 125 years (500/4) for the grid box (25,10), the magenta point in the first figure.

plot( timeNA[1:500], NAtemp[25,10,1:500], type="l",
xlab="years", ylab="temperature")





DISCLAIMER:

The data sets, software and related content in and linked to these pages are intended for scientific and mathematical research. The authors do not guarantee the correctness of the data, software or companion text. Please see the UCAR Terms of Use listed below.