Environmental conditions, particle flux and sympagic microalgal succession in spring before the sea-ice break-up in Adélie Land, East Antarctica

• Published in: Polar Research
• Main Authors: Riaux-Gobin, Catherine, Dieckmann, Gerhard, S, Poulin, Michel, Neveux, Jacques, Labrune, Céline, Vétion, Gilles
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: WILEY-BLACKWELL PUBLISHING 2013
• Subjects: Dumont d'Urville; Dumont d'Urville Station; Dumont-d'Urville; East Antarctica; Lejay; Lejay Bay; Pierre Lejay; Pierre-Lejay; Weddell; Weddell Sea; Antarc*; Antarctica; Petrel Island; Polar Research; Sea ice
• Online Access: https://epic.awi.de/id/eprint/33607/; https://epic.awi.de/id/eprint/33607/2/19675-99592-1-PB.pdf; https://doi.org/10.3402/polar.v32i0.19675; https://hdl.handle.net/10013/epic.41999; https://hdl.handle.net/10013/epic.41999.d002

Data pertaining to environmental conditions, sympagic (sea ice) microalgal dynamics and particle flux were collected before the spring ice break-up 2001 in Pierre Lejay Bay, adjacent to the Dumont d'Urville Station, Petrel Island, East Antarctica. An array of two multiple sediment traps and a current meter was deployed for five weeks, from 8 November to 6 December 2001. The sea-ice chlorophyll a and particulate organic carbon (POC) averaged 0.6 mg l−1 (30 mg m−2) and 20 mg l−1 (1 g m−2) near the coast. The POC export flux that reached a maximum of 79 mg m−2 d−1 during the study period was high compared to the one for the Weddell Sea. The flux was homogeneous from the surface to 47 m depth and increased sharply 33 days before the effective ice break-up. A north-western progressive vector of currents (i.e., Lagrangian drift) in the sub-ice surface waters was demonstrated. Bottom ice, platelet ice and under-ice water at 5 m were characterized by differences in colonization and short-term succession of microalgae.