Consider a changing world in which the coverage of the Arctic Ocean by sea ice is shrinking, as revealed in Figure 16.26. Discuss several feedbacks by which this should accelerate coastal erosion, given that the bluffs along the coast are simply frozen silt.

Figure 16.26

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(b) Fractional sea ice cover (a) Annual sea ice extent anomaly (%) 69 1 0.9 0.8 0.7 0.6 0.5 20 10 0 0 -10 -20 1970 Drew Point slope = -3.0(+/-)0.8 %/decade 1980 1990 sea ice September 2007 0.4 0.3 light 1989-1992 0.2 bold 2004-2007 0.1 0 2000 4 50 100 150 200 250 300 Time (Julian Day) 2010 350 400