Effects of sea ice retreat and ocean warming on the Laptev Sea continental slope ecosystem (1993 vs 2012)
The central Arctic Ocean is rapidly changing due to amplified warming and sea ice retreat. Nonetheless, it remains challenging to document and decipher impacts on key ecosystem processes such as primary production and pelagic-benthic coupling, due to limited observations in this remote area. Here we...
Published in: | Frontiers in Marine Science |
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Online Access: | http://dx.doi.org/10.3389/fmars.2022.1004959 https://www.frontiersin.org/articles/10.3389/fmars.2022.1004959/full |
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crfrontiers:10.3389/fmars.2022.1004959 2024-09-15T17:54:17+00:00 Effects of sea ice retreat and ocean warming on the Laptev Sea continental slope ecosystem (1993 vs 2012) Bienhold, Christina Schourup-Kristensen, Vibe Krumpen, Thomas Nöthig, Eva-Maria Wenzhöfer, Frank Korhonen, Meri Vredenborg, Myriel Hehemann, Laura Boetius, Antje FP7 Ideas: European Research Council Helmholtz Association Max-Planck-Gesellschaft Bundesministerium für Bildung und Forschung 2022 http://dx.doi.org/10.3389/fmars.2022.1004959 https://www.frontiersin.org/articles/10.3389/fmars.2022.1004959/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 9 ISSN 2296-7745 journal-article 2022 crfrontiers https://doi.org/10.3389/fmars.2022.1004959 2024-08-20T04:05:30Z The central Arctic Ocean is rapidly changing due to amplified warming and sea ice retreat. Nonetheless, it remains challenging to document and decipher impacts on key ecosystem processes such as primary production and pelagic-benthic coupling, due to limited observations in this remote area. Here we investigated environmental changes at the Laptev Sea continental slope (60-3400 m water depth) from the surface to the seafloor, by replicating sample transects two decades apart. Mean break-up of sea ice occurred earlier and mean freeze-up occurred later in 2012 compared to 1993, extending the ice-free period by more than 30 days. On average, observations and model results showed an annual increase in primary production of 30% and more in the study area in 2012. In contrast, calculated and modelled fluxes of particulate organic carbon (POC) to the seafloor were only slightly higher in 2012 and did not extend as far into the deep Laptev Sea as the increase in primary production, possibly due to a more developed retention system. Nevertheless, benthic surveys revealed a substantial increase in phytodetritus availability at the seafloor along the entire transect from the shelf edge to the deep sea. This calls for carbon input by lateral advection from the shelves, additional input from sea ice, and/or a late summer bloom. We also investigated the composition and activity of bacterial communities at the seafloor and potential linkages to the observed environmental changes. While bacterial abundance, biomass and overall community structure showed no systematic differences between the two contrasting years at all depths, extracellular enzymatic activities had increased as a result of higher food availability. This was partly reflected in higher benthic oxygen uptake, indicating a moderate impact on benthic remineralization rates at the time of sampling. Our results show considerable effects of ocean warming and sea ice loss on the ecosystem from the surface ocean to the seafloor in the Laptev Sea, which are likely to ... Article in Journal/Newspaper Arctic Ocean laptev Laptev Sea Sea ice Frontiers (Publisher) Frontiers in Marine Science 9 |
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Open Polar |
collection |
Frontiers (Publisher) |
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crfrontiers |
language |
unknown |
description |
The central Arctic Ocean is rapidly changing due to amplified warming and sea ice retreat. Nonetheless, it remains challenging to document and decipher impacts on key ecosystem processes such as primary production and pelagic-benthic coupling, due to limited observations in this remote area. Here we investigated environmental changes at the Laptev Sea continental slope (60-3400 m water depth) from the surface to the seafloor, by replicating sample transects two decades apart. Mean break-up of sea ice occurred earlier and mean freeze-up occurred later in 2012 compared to 1993, extending the ice-free period by more than 30 days. On average, observations and model results showed an annual increase in primary production of 30% and more in the study area in 2012. In contrast, calculated and modelled fluxes of particulate organic carbon (POC) to the seafloor were only slightly higher in 2012 and did not extend as far into the deep Laptev Sea as the increase in primary production, possibly due to a more developed retention system. Nevertheless, benthic surveys revealed a substantial increase in phytodetritus availability at the seafloor along the entire transect from the shelf edge to the deep sea. This calls for carbon input by lateral advection from the shelves, additional input from sea ice, and/or a late summer bloom. We also investigated the composition and activity of bacterial communities at the seafloor and potential linkages to the observed environmental changes. While bacterial abundance, biomass and overall community structure showed no systematic differences between the two contrasting years at all depths, extracellular enzymatic activities had increased as a result of higher food availability. This was partly reflected in higher benthic oxygen uptake, indicating a moderate impact on benthic remineralization rates at the time of sampling. Our results show considerable effects of ocean warming and sea ice loss on the ecosystem from the surface ocean to the seafloor in the Laptev Sea, which are likely to ... |
author2 |
FP7 Ideas: European Research Council Helmholtz Association Max-Planck-Gesellschaft Bundesministerium für Bildung und Forschung |
format |
Article in Journal/Newspaper |
author |
Bienhold, Christina Schourup-Kristensen, Vibe Krumpen, Thomas Nöthig, Eva-Maria Wenzhöfer, Frank Korhonen, Meri Vredenborg, Myriel Hehemann, Laura Boetius, Antje |
spellingShingle |
Bienhold, Christina Schourup-Kristensen, Vibe Krumpen, Thomas Nöthig, Eva-Maria Wenzhöfer, Frank Korhonen, Meri Vredenborg, Myriel Hehemann, Laura Boetius, Antje Effects of sea ice retreat and ocean warming on the Laptev Sea continental slope ecosystem (1993 vs 2012) |
author_facet |
Bienhold, Christina Schourup-Kristensen, Vibe Krumpen, Thomas Nöthig, Eva-Maria Wenzhöfer, Frank Korhonen, Meri Vredenborg, Myriel Hehemann, Laura Boetius, Antje |
author_sort |
Bienhold, Christina |
title |
Effects of sea ice retreat and ocean warming on the Laptev Sea continental slope ecosystem (1993 vs 2012) |
title_short |
Effects of sea ice retreat and ocean warming on the Laptev Sea continental slope ecosystem (1993 vs 2012) |
title_full |
Effects of sea ice retreat and ocean warming on the Laptev Sea continental slope ecosystem (1993 vs 2012) |
title_fullStr |
Effects of sea ice retreat and ocean warming on the Laptev Sea continental slope ecosystem (1993 vs 2012) |
title_full_unstemmed |
Effects of sea ice retreat and ocean warming on the Laptev Sea continental slope ecosystem (1993 vs 2012) |
title_sort |
effects of sea ice retreat and ocean warming on the laptev sea continental slope ecosystem (1993 vs 2012) |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/fmars.2022.1004959 https://www.frontiersin.org/articles/10.3389/fmars.2022.1004959/full |
genre |
Arctic Ocean laptev Laptev Sea Sea ice |
genre_facet |
Arctic Ocean laptev Laptev Sea Sea ice |
op_source |
Frontiers in Marine Science volume 9 ISSN 2296-7745 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2022.1004959 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
_version_ |
1810430535775813632 |