The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea
The western Weddell Sea along the northward branch of the Weddell Gyre is a region of major outflow of various water masses, thick sea ice, and biogeochemical matter, linking the Antarctic continent to the world oceans. It features a deep shelf and the second largest ice shelf (Larsen C) in the WS,...
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ftawi:oai:epic.awi.de:54371 2023-05-15T13:45:22+02:00 The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea Peeken, Ilka Arndt, Stefanie Janout, Markus Krumpen, Thomas Haas, Christian 2020 https://epic.awi.de/id/eprint/54371/ https://doi.org/10.5194/egusphere-egu2020-20152 https://hdl.handle.net/10013/epic.8354162e-265f-448b-94bd-b1e618aac482 unknown Peeken, I. orcid:0000-0003-1531-1664 , Arndt, S. , Janout, M. , Krumpen, T. and Haas, C. (2020) The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea , EGU General Assembly 2020, Vienna -Online -, 4 May 2020 - 8 May 2020 . doi:10.5194/egusphere-egu2020-20152 <https://doi.org/10.5194/egusphere-egu2020-20152> , hdl:10013/epic.8354162e-265f-448b-94bd-b1e618aac482 EPIC3EGU General Assembly 2020, Vienna -Online -, 2020-05-04-2020-05-08The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea Conference notRev 2020 ftawi https://doi.org/10.5194/egusphere-egu2020-20152 2021-12-24T15:46:24Z The western Weddell Sea along the northward branch of the Weddell Gyre is a region of major outflow of various water masses, thick sea ice, and biogeochemical matter, linking the Antarctic continent to the world oceans. It features a deep shelf and the second largest ice shelf (Larsen C) in the WS, and its perennial sea ice cover is among the thickest on earth. This region is undergoing dramatic changes due to the breakup of ice shelves along the Antarctic Peninsula, which results in oceanographic conditions unprecedented in the past 10,000 years. Since this region is difficult to access, comprehensive physical and biogeochemical information is still lacking. During the interdisciplinary Weddell Sea Ice (WedIce) expedition to the northwestern Weddell Sea on board the German icebreaker RV Polarstern in spring 2019, oceanographic and biogeochemical studies were conducted together with in-situ snow and ice sampling. Most stations visited contained second- and third-year ice. Additional airborne ice-thickness surveys revealed a mean ice thicknesses between 2.6 and 5.4 m, increasing from the Antarctic Sound towards the Larsen B region. Usually rotten ice was present below a solid, ~30 cm thick surface-ice layer, however, pronounced gap layers, typical for late summer ice in the marginal ice zone, were rare. The associated high algal biomass was only found north of the Antarctic Sound. Nevertheless, diatom-dominated standing stocks of integrated sea ice algae biomass were among the highest, previously described in Antarctic waters. In contrast, despite overall high macro-nutrient concentrations in the water, the biomass of the flagellate dominated phytoplankton was negligible for primary production in the entire region. Overall, it seems that despite changing light conditions for the phytoplankton due to the loss of ice shelves, the sea ice-derived carbon represents an important control variable for higher trophic levels in the western Weddell Sea. Conference Object Antarc* Antarctic Antarctic Peninsula ice algae Ice Shelf Ice Shelves Sea ice Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Antarctic Peninsula Antarctic Sound ENVELOPE(-56.500,-56.500,-63.500,-63.500) Rotten ENVELOPE(-53.417,-53.417,68.867,68.867) The Antarctic Weddell Weddell Sea |
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 |
The western Weddell Sea along the northward branch of the Weddell Gyre is a region of major outflow of various water masses, thick sea ice, and biogeochemical matter, linking the Antarctic continent to the world oceans. It features a deep shelf and the second largest ice shelf (Larsen C) in the WS, and its perennial sea ice cover is among the thickest on earth. This region is undergoing dramatic changes due to the breakup of ice shelves along the Antarctic Peninsula, which results in oceanographic conditions unprecedented in the past 10,000 years. Since this region is difficult to access, comprehensive physical and biogeochemical information is still lacking. During the interdisciplinary Weddell Sea Ice (WedIce) expedition to the northwestern Weddell Sea on board the German icebreaker RV Polarstern in spring 2019, oceanographic and biogeochemical studies were conducted together with in-situ snow and ice sampling. Most stations visited contained second- and third-year ice. Additional airborne ice-thickness surveys revealed a mean ice thicknesses between 2.6 and 5.4 m, increasing from the Antarctic Sound towards the Larsen B region. Usually rotten ice was present below a solid, ~30 cm thick surface-ice layer, however, pronounced gap layers, typical for late summer ice in the marginal ice zone, were rare. The associated high algal biomass was only found north of the Antarctic Sound. Nevertheless, diatom-dominated standing stocks of integrated sea ice algae biomass were among the highest, previously described in Antarctic waters. In contrast, despite overall high macro-nutrient concentrations in the water, the biomass of the flagellate dominated phytoplankton was negligible for primary production in the entire region. Overall, it seems that despite changing light conditions for the phytoplankton due to the loss of ice shelves, the sea ice-derived carbon represents an important control variable for higher trophic levels in the western Weddell Sea. |
format |
Conference Object |
author |
Peeken, Ilka Arndt, Stefanie Janout, Markus Krumpen, Thomas Haas, Christian |
spellingShingle |
Peeken, Ilka Arndt, Stefanie Janout, Markus Krumpen, Thomas Haas, Christian The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea |
author_facet |
Peeken, Ilka Arndt, Stefanie Janout, Markus Krumpen, Thomas Haas, Christian |
author_sort |
Peeken, Ilka |
title |
The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea |
title_short |
The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea |
title_full |
The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea |
title_fullStr |
The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea |
title_full_unstemmed |
The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea |
title_sort |
importance of sea ice biota for the ecosystem in the northwestern weddell sea |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/54371/ https://doi.org/10.5194/egusphere-egu2020-20152 https://hdl.handle.net/10013/epic.8354162e-265f-448b-94bd-b1e618aac482 |
long_lat |
ENVELOPE(-56.500,-56.500,-63.500,-63.500) ENVELOPE(-53.417,-53.417,68.867,68.867) |
geographic |
Antarctic Antarctic Peninsula Antarctic Sound Rotten The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Antarctic Sound Rotten The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula ice algae Ice Shelf Ice Shelves Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula ice algae Ice Shelf Ice Shelves Sea ice Weddell Sea |
op_source |
EPIC3EGU General Assembly 2020, Vienna -Online -, 2020-05-04-2020-05-08The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea |
op_relation |
Peeken, I. orcid:0000-0003-1531-1664 , Arndt, S. , Janout, M. , Krumpen, T. and Haas, C. (2020) The importance of sea ice biota for the ecosystem in the northwestern Weddell Sea , EGU General Assembly 2020, Vienna -Online -, 4 May 2020 - 8 May 2020 . doi:10.5194/egusphere-egu2020-20152 <https://doi.org/10.5194/egusphere-egu2020-20152> , hdl:10013/epic.8354162e-265f-448b-94bd-b1e618aac482 |
op_doi |
https://doi.org/10.5194/egusphere-egu2020-20152 |
_version_ |
1766222502354223104 |