Sea-ice Situation in the Arctic Continues to be at a Seasonal Low

Figure 4: Anomaly in the mean sea-ice thickness, based on CryoSat-2 observational data. This shows the difference between the mean value and the observations for 2010-2017. Those regions with above-average (East Siberian Sea) and below-average (Fram Strait) ice thicknesses are highlighted.

Figure 7a-d: Distribution of sea-ice ages in calendar week 9 (end of February / beginning of March) in 1984 (a) and in 2018 (b). The time series (c) shows the sea-ice concentration for various classes of ice thickness found in the Arctic Ocean (d). (Source: Preliminary analysis courtesy of M. Tschudi, University of Colorado Boulder. Images by M. Tschudi, S. Stewart, University of Colorado, Boulder, and W. Meier, J. Stroeve, NSIDC)

Figure 9: (a) Time series of winter ice growth (mid-November to mid-April) from 1985 to 2017, as calculated by the Los Alamos sea ice model (CICE), which was in turn supplied with reanalysis data from the National Center for Environmental Prediction (NCEP-2). (b) 2 m air temperature (NCEP-2) averaged over the Arctic Ocean (c), cumulative freezing degree days (FDDs) and (d) the sea-ice thickness in November, as simulated by the CICE. (Source: Stroeve et al. 2018, NSIDC)