Early snowmelt and sea ice breakup enhance algal export in the Beaufort Sea
Microalgal cells collected with moored sediment traps deployed during three to five annual cycles at three sites in the Beaufort Sea were identified to investigate variations in the timing, abundance and composition of microalgal fluxes in relation to snow and sea ice cover. The investigation period...
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Online Access: | https://epic.awi.de/id/eprint/53569/ https://hdl.handle.net/10013/epic.8cf32bfd-39f6-46fb-a0d5-99cec754b74e |
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ftawi:oai:epic.awi.de:53569 2023-05-15T15:00:38+02:00 Early snowmelt and sea ice breakup enhance algal export in the Beaufort Sea Nadaï, Gabrielle Nöthig, Eva-Maria Fortier, Louis Lalande, Catherine 2021-01 https://epic.awi.de/id/eprint/53569/ https://hdl.handle.net/10013/epic.8cf32bfd-39f6-46fb-a0d5-99cec754b74e unknown PERGAMON-ELSEVIER SCIENCE LTD Nadaï, G. , Nöthig, E. M. orcid:0000-0002-7527-7827 , Fortier, L. and Lalande, C. orcid:0000-0002-1416-7288 (2021) Early snowmelt and sea ice breakup enhance algal export in the Beaufort Sea , Progress In Oceanography, 190 . doi:10.1016/j.pocean.2020.102479 <https://doi.org/10.1016/j.pocean.2020.102479> , hdl:10013/epic.8cf32bfd-39f6-46fb-a0d5-99cec754b74e EPIC3Progress In Oceanography, PERGAMON-ELSEVIER SCIENCE LTD, 190, ISSN: 0079-6611 Article isiRev 2021 ftawi https://doi.org/10.1016/j.pocean.2020.102479 2021-12-24T15:46:07Z Microalgal cells collected with moored sediment traps deployed during three to five annual cycles at three sites in the Beaufort Sea were identified to investigate variations in the timing, abundance and composition of microalgal fluxes in relation to snow and sea ice cover. The investigation period encompassed two extremes in snow and sea ice conditions: a delayed melt due to an ice rebound in 2013 and a premature snowmelt and sea ice breakup that led to an ice-free Beaufort Sea in 2016. Diatoms dominated the microalgal fluxes, with the pelagic centric diatoms Thalassiosira spp. and the ice-associated pennate diatoms Fragilariopsis spp. consistently collected at the three sites. The export of the ice-obligated algae Nitzschia frigida indicated the release of sea ice algae at the onset of snowmelt. Early snowmelt and sea ice breakup in 2016 contributed to an early start of ice algae release accompanied with early peaks in diatom fluxes and higher diatom and phytoplankton carbon (PPC) fluxes during spring and summer. Conversely, delayed sea ice algae release, low diatom fluxes, and low PPC fluxes were observed when snowmelt and sea ice breakup occurred late over the Mackenzie shelf break. The amount of diatoms exported at ~100–300 m also likely depended on a match or mismatch between algal production and zooplankton grazing. Variations in the snow and sea ice regimes at the regional scale therefore directly impact the timing and magnitude of microalgal export and its contribution to particulate organic carbon flux in the Arctic Ocean. With global warming, the ongoing sea ice reduction in the Arctic Ocean may increase PPC fluxes to the seafloor and potential carbon sequestration at depth. Article in Journal/Newspaper Arctic Arctic Ocean Beaufort Sea Global warming ice algae Mackenzie Shelf Phytoplankton Sea ice Zooplankton Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Progress in Oceanography 190 102479 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Microalgal cells collected with moored sediment traps deployed during three to five annual cycles at three sites in the Beaufort Sea were identified to investigate variations in the timing, abundance and composition of microalgal fluxes in relation to snow and sea ice cover. The investigation period encompassed two extremes in snow and sea ice conditions: a delayed melt due to an ice rebound in 2013 and a premature snowmelt and sea ice breakup that led to an ice-free Beaufort Sea in 2016. Diatoms dominated the microalgal fluxes, with the pelagic centric diatoms Thalassiosira spp. and the ice-associated pennate diatoms Fragilariopsis spp. consistently collected at the three sites. The export of the ice-obligated algae Nitzschia frigida indicated the release of sea ice algae at the onset of snowmelt. Early snowmelt and sea ice breakup in 2016 contributed to an early start of ice algae release accompanied with early peaks in diatom fluxes and higher diatom and phytoplankton carbon (PPC) fluxes during spring and summer. Conversely, delayed sea ice algae release, low diatom fluxes, and low PPC fluxes were observed when snowmelt and sea ice breakup occurred late over the Mackenzie shelf break. The amount of diatoms exported at ~100–300 m also likely depended on a match or mismatch between algal production and zooplankton grazing. Variations in the snow and sea ice regimes at the regional scale therefore directly impact the timing and magnitude of microalgal export and its contribution to particulate organic carbon flux in the Arctic Ocean. With global warming, the ongoing sea ice reduction in the Arctic Ocean may increase PPC fluxes to the seafloor and potential carbon sequestration at depth. |
format |
Article in Journal/Newspaper |
author |
Nadaï, Gabrielle Nöthig, Eva-Maria Fortier, Louis Lalande, Catherine |
spellingShingle |
Nadaï, Gabrielle Nöthig, Eva-Maria Fortier, Louis Lalande, Catherine Early snowmelt and sea ice breakup enhance algal export in the Beaufort Sea |
author_facet |
Nadaï, Gabrielle Nöthig, Eva-Maria Fortier, Louis Lalande, Catherine |
author_sort |
Nadaï, Gabrielle |
title |
Early snowmelt and sea ice breakup enhance algal export in the Beaufort Sea |
title_short |
Early snowmelt and sea ice breakup enhance algal export in the Beaufort Sea |
title_full |
Early snowmelt and sea ice breakup enhance algal export in the Beaufort Sea |
title_fullStr |
Early snowmelt and sea ice breakup enhance algal export in the Beaufort Sea |
title_full_unstemmed |
Early snowmelt and sea ice breakup enhance algal export in the Beaufort Sea |
title_sort |
early snowmelt and sea ice breakup enhance algal export in the beaufort sea |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/53569/ https://hdl.handle.net/10013/epic.8cf32bfd-39f6-46fb-a0d5-99cec754b74e |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Beaufort Sea Global warming ice algae Mackenzie Shelf Phytoplankton Sea ice Zooplankton |
genre_facet |
Arctic Arctic Ocean Beaufort Sea Global warming ice algae Mackenzie Shelf Phytoplankton Sea ice Zooplankton |
op_source |
EPIC3Progress In Oceanography, PERGAMON-ELSEVIER SCIENCE LTD, 190, ISSN: 0079-6611 |
op_relation |
Nadaï, G. , Nöthig, E. M. orcid:0000-0002-7527-7827 , Fortier, L. and Lalande, C. orcid:0000-0002-1416-7288 (2021) Early snowmelt and sea ice breakup enhance algal export in the Beaufort Sea , Progress In Oceanography, 190 . doi:10.1016/j.pocean.2020.102479 <https://doi.org/10.1016/j.pocean.2020.102479> , hdl:10013/epic.8cf32bfd-39f6-46fb-a0d5-99cec754b74e |
op_doi |
https://doi.org/10.1016/j.pocean.2020.102479 |
container_title |
Progress in Oceanography |
container_volume |
190 |
container_start_page |
102479 |
_version_ |
1766332711831601152 |