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We estimate the effect of the Arctic sea ice on the absorbed (net) solarflux using a radiative transfer model. Ice and cloud input data to themodel come from satellite observations, processed by the InternationalSatellite Cloud Climatology Project (ISCCP) and span the period July 1983–June2007. The sea-ice effect on the solar radiation fluctuates seasonally with thesolar flux and decreases interannually in synchronisation with the decreasingsea-ice extent. A disappearance of the Arctic ice cap during the sunlit periodof the year would radically reduce the local albedo and cause an annually averaged19.7 W m−2 increase in absorbed solar flux at the Arctic Ocean surface,or equivalently an annually averaged 0.55 W m−2 increase on theplanetary scale. In the clear-sky scenario these numbers increase to 34.9 and0.97 W m−2, respectively. A meltdown only in September, with allother months unaffected, increases the Arctic annually averaged solar absorptionby 0.32 W m−2. We examined the net solar flux trends for the ArcticOcean and found that the areas absorbing the solar flux more rapidly are theNorth Chukchi and Kara Seas, Baffin and Hudson Bays, and Davis Strait. Thesensitivity of the Arctic absorbed solar flux on sea-ice extent and cloudamount was assessed. Although sea ice and cloud affect jointly the solar flux,we found little evidence of strong non-linearities

The effect of Arctic sea-ice extent on the absorbed (net) solar flux at the surface, based on ISCCP-D2 cloud data for 1983–2007