FN Archimer Export Format
PT J
TI First description of in situ chlorophyll fluorescence signal within East Antarctic coastal polynyas during fall and winter
BT 
AF Bourreau, Lucie
   Pauthenet, Etienne
   Le Ster, Loïc
   Picard, Baptiste
   Portela, Esther
   Sallée, Jean-Baptiste
   McMahon, Clive R.
   Harcourt, Robert
   Hindell, Mark
   Guinet, Christophe
   Bestley, Sophie
   Charrassin, Jean-Benoît
   DuVivier, Alice
   Sylvester, Zephyr
   Krumhardt, Kristen
   Jenouvrier, Stéphanie
   Labrousse, Sara
AS 1:1,2;2:3;3:4,5;4:4;5:6,7,13;6:2;7:8;8:9;9:6,10;10:4;11:6,10;12:2;13:11;14:12;15:11;16:1;17:2;
FF 1:;2:PDG-ODE-LOPS-OH;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;
C1 Department of Biology, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
   LOCEAN, UMR 7159 Sorbonne-Université, CNRS, MNHN, IRD, IPSL, Paris, France
   LOPS, Ifremer, Univ. Brest, CNRS, IRD, IUEM, Plouzané, France
   CEBC, CNRS UPR 1934, Villiers en Bois, France
   Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, LOV, Villefranche-sur-Mer, France
   Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia
   Centre for Ocean and Atmospheric Sciences, Faculty of Science, University of East Anglia, Norwich, United Kingdom
   IMOS Animal Tagging, Sydney Institute of Marine Science, Mosman, NSW, Australia
   School of Natural Sciences, Macquarie University, Sydney, NSW, Australia
   Australian Centre for Excellence in Antarctic Science, University of Tasmania, Hobart, TAS, Australia
   Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
   Environmental Studies Program, University of Colorado, Boulder, CO, United States
   LOPS, Ifremer, Univ. Brest, CNRS, IRD, IUEM, Plouzané, France
C2 WHOI, USA
   UNIV SORBONNE, FRANCE
   IFREMER, FRANCE
   CNRS, FRANCE
   UNIV SORBONNE, FRANCE
   UNIV TASMANIA, AUSTRALIA
   UNIV EAST ANGLIA, UK
   SIMS, AUSTRALIA
   UNIV MACQUARIE, AUSTRALIA
   UNIV TASMANIA, AUSTRALIA
   NCAR, USA
   UNIV COLORADO BOULDER, USA
   IRD, FRANCE
SI BREST
SE PDG-ODE-LOPS-OH
UM LOPS
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-p187
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 3.7
TC 0
UR https://archimer.ifremer.fr/doc/00848/96011/104005.pdf
   https://archimer.ifremer.fr/doc/00848/96011/104006.docx
LA English
DT Article
DE ;sea ice;Antarctic polynya;biotelemetry;chlorophyll-a;CTD
AB Antarctic coastal polynyas are persistent and recurrent regions of open water located between the coast and the drifting pack-ice. In spring, they are the first polar areas to be exposed to light, leading to the development of phytoplankton blooms, making polynyas potential ecological hotspots in sea-ice regions. Knowledge on polynya oceanography and ecology during winter is limited due to their inaccessibility. This study describes i) the first in situ chlorophyll fluorescence signal (a proxy for chlorophyll-a concentration and thus presence of phytoplankton) in polynyas between the end of summer and winter, ii) assesses whether the signal persists through time and iii) identifies its main oceanographic drivers. The dataset comprises 698 profiles of fluorescence, temperature and salinity recorded by southern elephant seals in 2011, 2019-2021 in the Cape-Darnley (CDP;67˚S-69˚E) and Shackleton (SP;66˚S-95˚E) polynyas between February and September. A significant fluorescence signal was observed until April in both polynyas. An additional signal occurring at 130m depth in August within CDP may result from in situ growth of phytoplankton due to potential adaptation to low irradiance or remnant chlorophyll-a that was advected into the polynya. The decrease and deepening of the fluorescence signal from February to August was accompanied by the deepening of the mixed layer depth and a cooling and salinification of the water column in both polynyas. Using Principal Component Analysis as an exploratory tool, we highlighted previously unsuspected drivers of the fluorescence signal within polynyas. CDP shows clear differences in biological and environmental conditions depending on topographic features with higher fluorescence in warmer and saltier waters on the shelf compared with the continental slope. In SP, near the ice-shelf, a significant fluorescence signal in April below the mixed layer (around 130m depth), was associated with fresher and warmer waters. We hypothesize that this signal could result from potential ice-shelf melting from warm water intrusions onto the shelf leading to iron supply necessary to fuel phytoplankton growth. This study supports that Antarctic coastal polynyas may have a key role for polar ecosystems as biologically active areas throughout the season within the sea-ice region despite inter and intra-polynya differences in environmental conditions. 
PY 2023
PD JUN
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media SA
VL 10
UT 001047914400001
DI 10.3389/fmars.2023.1186403
ID 96011
ER

EF