Abstract

Abstract We report on results of a long-term (1993–2007) time series sediment trap moored at 170 m to the west of the Antarctic Peninsula in the mid-continental shelf region (350 m depth; 64°30′S, 66°00′W). This is a region characterized by late spring–summer diatom blooms, moderately high seasonal primary productivity (50–150 mmol C m−2 d−1 in December–February), and high phytoplankton and krill biomass in the seasonal sea-ice zone. The mass flux ranged from near 0 to over 1 g m−2 d−1 and was near 0% to >30% organic carbon (mean 8%). Sedimentation from the upper ocean as estimated by the trap collections at 170 m exhibited strong seasonality with high fluxes (1–10 mmol C m−2 d−1) in November–March following ice retreat and very low fluxes (

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