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Arctic sea ice extent has declined continuously for the past decade, owingpartially to light absorption by black carbon (BC) and other impuritiesdeposited on snow and the underlying pack. We present simulations for thecontemporary period showing that the optical depth contributed by Arctic icealgal chlorophyll may be comparable during Boreal Spring to the correspondingvalues attributable to BC. The largest chlorophyll attenuation is obtained inthe bottom layer, which supports pigment concentrations of about 300 to 1000mg/m3 in the Bering Sea and Sea of Okhotsk. However, chlorophyll concentrationsfor the ice interior in regions north of 75{\deg} N and across the CanadianArchipelago are less than 0.1 micro g/m3. Freeboard and infiltrationcommunities lead to intermediate levels of light removal. Since BC works itsway downward from the atmospheric interface, there will be regions where itappropriates photosynthetic capability. Where ice thicknesses permitsignificant penetration through the pack column the ice algae may be crucialabsorbers. We propose a continuous increase in relative chlorophyll activityand attenuation in the future, as biological activity becomes stronger in thinice toward the center of the Arctic basin. A shift in relative importance ofthe two absorber types could occur as total BC mixing ratios are reducedbecause of environmental advocacy.

Light Absorption in Arctic Sea Ice: Chlorophyll and Black Carbon