First description of in situ chlorophyll fluorescence signal within East Antarctic coastal polynyas during fall and winter
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 se...
Published in: | Frontiers in Marine Science |
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Frontiers Media SA
2023
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Online Access: | http://dx.doi.org/10.3389/fmars.2023.1186403 https://www.frontiersin.org/articles/10.3389/fmars.2023.1186403/full |
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crfrontiers:10.3389/fmars.2023.1186403 2024-02-11T09:58:54+01:00 First description of in situ chlorophyll fluorescence signal within East Antarctic coastal polynyas during fall and winter 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 2023 http://dx.doi.org/10.3389/fmars.2023.1186403 https://www.frontiersin.org/articles/10.3389/fmars.2023.1186403/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 10 ISSN 2296-7745 Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography journal-article 2023 crfrontiers https://doi.org/10.3389/fmars.2023.1186403 2024-01-26T09:58:32Z 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 ... Article in Journal/Newspaper Antarc* Antarctic Elephant Seals Ice Shelf Sea ice Southern Elephant Seals Frontiers (Publisher) Antarctic Cape Darnley ENVELOPE(69.567,69.567,-67.738,-67.738) Darnley ENVELOPE(69.717,69.717,-67.717,-67.717) Shackleton Frontiers in Marine Science 10 |
institution |
Open Polar |
collection |
Frontiers (Publisher) |
op_collection_id |
crfrontiers |
language |
unknown |
topic |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography |
spellingShingle |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography 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 First description of in situ chlorophyll fluorescence signal within East Antarctic coastal polynyas during fall and winter |
topic_facet |
Ocean Engineering Water Science and Technology Aquatic Science Global and Planetary Change Oceanography |
description |
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 ... |
format |
Article in Journal/Newspaper |
author |
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 |
author_facet |
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 |
author_sort |
Bourreau, Lucie |
title |
First description of in situ chlorophyll fluorescence signal within East Antarctic coastal polynyas during fall and winter |
title_short |
First description of in situ chlorophyll fluorescence signal within East Antarctic coastal polynyas during fall and winter |
title_full |
First description of in situ chlorophyll fluorescence signal within East Antarctic coastal polynyas during fall and winter |
title_fullStr |
First description of in situ chlorophyll fluorescence signal within East Antarctic coastal polynyas during fall and winter |
title_full_unstemmed |
First description of in situ chlorophyll fluorescence signal within East Antarctic coastal polynyas during fall and winter |
title_sort |
first description of in situ chlorophyll fluorescence signal within east antarctic coastal polynyas during fall and winter |
publisher |
Frontiers Media SA |
publishDate |
2023 |
url |
http://dx.doi.org/10.3389/fmars.2023.1186403 https://www.frontiersin.org/articles/10.3389/fmars.2023.1186403/full |
long_lat |
ENVELOPE(69.567,69.567,-67.738,-67.738) ENVELOPE(69.717,69.717,-67.717,-67.717) |
geographic |
Antarctic Cape Darnley Darnley Shackleton |
geographic_facet |
Antarctic Cape Darnley Darnley Shackleton |
genre |
Antarc* Antarctic Elephant Seals Ice Shelf Sea ice Southern Elephant Seals |
genre_facet |
Antarc* Antarctic Elephant Seals Ice Shelf Sea ice Southern Elephant Seals |
op_source |
Frontiers in Marine Science volume 10 ISSN 2296-7745 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2023.1186403 |
container_title |
Frontiers in Marine Science |
container_volume |
10 |
_version_ |
1790594731948900352 |