Sea ice data is from Cavalieri, D.J., C.L. Parkinson, P. Gloersen, H.J. Zwally.
1996, updated yearly. Sea Ice Concentrations from Nimbus-7 SMMR and DMSP
SSM/I-SSMIS Passive Microwave Data, Version 1. Boulder, Colorado USA.
NASA National Snow and Ice Data Center Distributed Active Archive Center.
doi: http://dx.doi.org/10.5067/8GQ8LZQVL0VL, plotted in Matlab using
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