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Ice algae, phytoplankton, zooplankton and the vertical fluxes of chloropigments andparticulate organic carbon (POC) were monitored from May to June/July of 1992, 1994 and 1995under the ice of Barrow Strait (Canadian Arctic Archipelago). Large interannual differences in thetiming, magnitude and nature of vertical fluxes were driven by meteorological events that controlledsnow cover and by differences in zooplankton assemblages. In 1992, ice algae released from the icematrix were intensely recycled by the exceptionally abundant calanoid Pseudocalanus acuspes . Thepersistent snow cover delayed the phytoplankton bloom until after the ice break-up in July. Ice algaewere abruptly released and sank rapidly to depth following early rain in late May 1994 and a heat-wave in early June 1995. In both years, the early removal of snow triggered an under-ice phyto-plankton bloom and strong downward fluxes of POC and chloropigments (13.7 gC m –2 , 381 mgchloropigments m –2 in 1994). In the absence of nutrient limitation, under-ice fluxes represented anet addition to the annual flux of POC. The analysis of local climate from 1950 to 1995 suggests thatstrong and early under-ice fluxes of biogenic carbon in spring may become more frequent under theclimatic conditions anticipated by general circulation models.KEY WORDS: Sea ice · Carbon flux · Climate forcing · Copepod grazing · Arctic

Climatic and biological forcing of the vertical flux of biogenic particles under seasonal Arctic sea ice