Holocene productivity changes off Adelie Land (East Antarctica)

Type Article
Date 2009-08
Language English
Author(s) Denis Delphine1, Crosta Xavier1, Schmidt Sabine1, Carson Damien S.2, Ganeshram Raja S.2, Renssen Hans4, Crespin Julien3, Ther Olivier1, Billy Isabelle1, Giraudeau Jacques1
Affiliation(s) 1 : Univ Bordeaux 1, CNRS, UMR 5805, EPOC, F-33405 Talence, France.
2 : Univ Edinburgh, Grant Inst, Sch Geosci, Edinburgh EH9 3JW, Midlothian, Scotland.
3 : CNRS, UMR 6635, CEREGE, F-13545 Aix En Provence 4, France.
4 : Vrije Univ Amsterdam, Fac Earth & Life Sci, NL-1081 HV Amsterdam, Netherlands.
Source Paleoceanography (0883-8305) (Amer Geophysical Union), 2009-08 , Vol. 24 , N. PA3207 , P. 1-12
DOI 10.1029/2008PA001689
WOS© Times Cited 25
Abstract This study presents the first high-resolution multiproxy investigation of primary productivity ( PP) during the Holocene from the Antarctic continental margins. Micropaleontological and geochemical data from the sediment core MD03-2601, associated to sea ice model outputs, give unprecedented insights into the biological pump of the Antarctic coastal area off Adelie Land in response to climatic changes. Plurimillennial and millennial 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 at the millennial timescale remain more enigmatic. Our results emphasize enhanced biological pump during warmer and windier Holocene phases because of a longer growing season and greater nutrient input. Antarctic coastal and continental shelf zones may therefore represent a more intense carbon sink in the future.
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Denis Delphine, Crosta Xavier, Schmidt Sabine, Carson Damien S., Ganeshram Raja S., Renssen Hans, Crespin Julien, Ther Olivier, Billy Isabelle, Giraudeau Jacques (2009). Holocene productivity changes off Adelie Land (East Antarctica). Paleoceanography, 24(PA3207), 1-12. Publisher's official version : https://doi.org/10.1029/2008PA001689 , Open Access version : https://archimer.ifremer.fr/doc/00218/32930/