mairindeith/climatestripes

Climate stripes plots R package

What are Climate Stripes?

Climate stripes are visualisations of climate change from a temperature time series (Climate Lab 2018). They are meant mostly as a communication tool to a lay public and can be grasped almost instantly. They were developed to have minimal annotation almost like a colour bar code. Legend and time axis options have been included here if one wants to convey a bit more information.

Installation

library(devtools)
install_github("duplisea/climatestripes")

library(climatestripes)

Make climate stripe plots for the Hadley CRUT4 sea surface temperature

time.vector= sst$year
temperature.vector= sst$median
title.name= "Global annual median sea surface temperature anomalies (Hadley CRUT4)"

climate.col.stripes.f(time.vector= time.vector,temperature.vector=temperature.vector,
  colour.vec=c("navyblue","lightblue", "red","darkred"),
  title=title.name,
  legend=T,
  text.col.legend="yellow")

This clearly shows a warming particularly since the early 1980s.

This is quite similar to the climate lab’s three colour gradient but their gradient theoretically makes average data white.

From https://www.climate-lab-book.ac.uk/2018/climate-stripes-for-the-uk/

You may want to code missing data as white though in which case that could be deceptive take this plot from St Margaret’s Bay, NS, Canada for example. There are missing data around 2012 which are coded white and they may appear as average at quick glance. Of course you could use another distinctive colour for missing data. Experiment with different gradients and you may find something that works better for you. You could add as many colours as years even.

time.vector= stmargaretsbay$YEAR
temperature.vector= stmargaretsbay$metANN
temperature.vector[temperature.vector==999.9]=NA
climate.col.stripes.f(time.vector= time.vector,temperature.vector= temperature.vector,
  colour.vec=c("navyblue","lightblue","white","red","darkred"),
  title="St Margaret's Bay, NS, Canada surface temperature annual mean (NASA GISS)",
  legend=T,
  text.col.legend="yellow")

Make a climate stripe plot with data and a trendline superimposed

It can be interesting to plot anomalies without a legend scale and superimpose the data and trendline on it. This conveys more information which can appeal to scientists without loosing the appeal of climate stripes plots to the lay public. One has been constructed here that looks like the climate lab climate stripes plots with data and gam trendline superimposed.

time.vector= sst$year
temperature.vector= sst$median
title.name= "Global annual median sea surface temperature anomalies (Hadley CRUT4)"

climate.col.stripes.f(time.vector= time.vector,temperature.vector=temperature.vector,
  colour.vec=c("navyblue","lightblue", "red","darkred"),
  title=title.name,
  legend=F,
  text.col.legend="yellow")

superimpose.data.f(time.vector=time.vector, temperature.vector=temperature.vector, data.colour="yellow", spline=T, spline.colour="white",lwd=4)

An annual climate stripe image with one plot for each month of the year

months=c("JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC")
monthcols= match(months,names(stmargaretsbay))
time.vector= stmargaretsbay$YEAR
par(mfcol=c(6,2),mar=c(.2,.1,.5,.1))
for (i in monthcols){
  temperature.vector= stmargaretsbay[,i]
  temperature.vector[temperature.vector==999.9]=NA
  climate.col.stripes.f(time.vector= time.vector,temperature.vector, colour.vec=c("navyblue","lightblue","red"),title=months[i-1], time.scale=F)
}

The axis has been omitted to bring out the general pattern and comparison between months. The legends give an idea of the actual temperature each month.

References

Climate Lab. 2018. https://www.climate-lab-book.ac.uk/2018/warming-stripes/

Enfield, D.B., A.M. Mestas-Nunez, and P.J. Trimble, 2001: The Atlantic Multidecadal Oscillation and its relationship to rainfall and river flows in the continental U.S., Geophys. Res. Lett., 28: 2077-2080.

GISTEMP Team, 2019: GISS Surface Temperature Analysis (GISTEMP), version 4. NASA Goddard Institute for Space Studies. Dataset accessed 2019-06-20 at https://data.giss.nasa.gov/gistemp/.

Morice, C. P., J. J. Kennedy, N. A. Rayner, and P. D. Jones. 2011. Quantifying uncertainties in global and regional temperature change using an ensemble of observational estimates: The HadCRUT4 dataset, J. Geophys. Res., 117, D08101, doi:10.1029/2011JD017187.

Citation

Duplisea, D.E. 2019. An R package for making climate stripe plots. https://github.com/duplisea/climatestripes