Citation

Noetzli, J., H. H. Christiansen, M. Gugliemin, V. E. Romanovsky, N. I. Shiklomanov, S. L. Smith, and L. Zhao. 2016. Cryosphere, Permafrost thermal state [in—State of the Climate in 2015]. Bulletin of the American Meteorological Society. 97: S20-S22. http://www.ametsoc.net/sotc/StateoftheClimate2015_lowres.pdf.