Physical and biological controls on DMS,P dynamics in ice shelf-influenced fast ice during a winter-spring and a spring-summer transitions.

Gauthier Carnat, Jiayun Zhou, Tim Papakyriakou, B. Delille, Thomas Goossens, Tim Haskell, V. Schoemann, François Fripiat, Janne-Markus Rintala, Jean Louis Tison

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We report the seasonal and vertical variations of dimethylsulfide (DMS) and its precursor dimethylsulfoniopropionate(DMSP) in fast ice at Cape Evans, McMurdo Sound (Antarctica) during the springsummer transition in 2011 and winter-spring transition in 2012. We compare the variations of DMS,P
observed to the seasonal evolution of the ice algal biomass and of the physical properties of the ice cover,with emphasis on the ice texture and brine dynamics. Isolated DMS and DMSP maxima were found during
both seasonal episodes in interior ice and corresponded to the occurrence of platelet crystals in the ice texture. We show that platelet crystals formation corresponded in time and depth to the incorporation of dinoflagellates (strong DMSP producers) in the ice cover. We also show that platelet crystals could modify the environmental stresses on algal cells and perturb the vertical redistribution of DMS,P concentrations. We show that during the winter-spring transition in 2012, the DMS,P profiles were strongly influenced by the development and decline of a diatom-dominated bloom in the bottom ice, with DMSP variations remarkably
following chl a variations. During the spring-summer transition in 2011, the increase in brine volume
fraction (influencing ice permeability) on warming was shown to trigger (1) an important release of DMS to
the under-ice water through brine convection and (2) a vertical redistribution of DMSP across the ice.
Original languageEnglish
Pages (from-to)2882-2905
Number of pages24
JournalJournal of Geophysical Research
Volume119
Issue number2014
Publication statusPublished - 14 May 2014

Keywords

  • sea ice
  • dimethylsulfide
  • mcmurdo sound
  • platelet ice

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