This data set from Connelly et al. (2017) measures the Arctic sea ice extent in 10^6 square kilometers. It includes lower bounds and upper bounds on annual averages.

arcticseaice

## Format

A data frame with 115 observations on the following 4 variables.

year

the year

value

the annual Arctic sea ice extent (in 10^6 sq km)

ub

The upper bound of the value, provided by Connelly et al.

lb

The lower bound of the value, provided by Connelly et al.

## Details

This is for illustration of climate change for my intro students. Connelly et al. (2017) are in part a methodological paper. The data I present here are from the "rescaled (unadjusted T)" data in the second sheet from their replication files.

## References

Connolly et al. (2017), ''Re-calibration of Arctic sea ice extent datasets using Arctic surface air temperature records''. *Hydrological Sciences Journal* 62(8): 1317--40.