Holocene productivity changes off Adelie Land (East Antarctica)

摘要

[1] This study presents the first high-resolution multiproxy investigation of primary productivity (PP) duringthe Holocene from the Antarctic continental margins. Micropaleontological and geochemical data from thesediment core MD03-2601, associated to sea ice model outputs, give unprecedented insights into the biologicalpump of the Antarctic coastal area off Adelie Land in response to climatic changes. Plurimillennial andmillennial changes of PP are observed in the study area in response to changes in nutrient availability,stratification, and growing season duration, which are linked to sea ice, upwelling, wind, and glacier dynamics.The precessional cycle seems to be responsible in the PP long-term variations, while forcing factors involved atthe millennial timescale remain more enigmatic. Our results emphasize enhanced biological pump duringwarmer and windier Holocene phases because of a longer growing season and greater nutrient input. Antarcticcoastal and continental shelf zones may therefore represent a more intense carbon sink in the future.