Why is arctic ice cover declining at the same time as high latitude solar

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insolation is declining? ? The mean annual solar insolation at 80 N is declining by 0.05% per century due to the Milankovitch cycle.
Borisenkov, YE. P., Tsvetkov, A. V. and Eddy, J.A., Combined Effects of Earth Orbit Perturbations and Solar Activity on Terrestrial Insolation. Part I: Sample Days and Annual Mean Values. (1985) J. Atmospheric Sciences 42(9) 933-940.
http://ams.allenpress.com/archive/1520-0469/42/9/pdf/i1520-0469-42-9-933.pdf
The sea ice extent:
http://www.nsidc.org/data/seaice_index/n_plot.html
 
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