Particle flux on the continental shelf in the Amundsen Sea Polynya and Western Antarctic Peninsula
Abstract We report results from a yearlong, moored sediment trap in the Amundsen Sea Polynya (ASP), the first such time series in this remote and productive ecosystem. Results are compared to a long-term (1992–2013) time series from the western Antarctic Peninsula (WAP). The ASP trap was deployed fr...
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ftdoajarticles:oai:doaj.org/article:1bd32d8facaf4bc598b64db9a37b0f64 2023-05-15T13:23:50+02:00 Particle flux on the continental shelf in the Amundsen Sea Polynya and Western Antarctic Peninsula Hugh W. Ducklow Stephanie E. Wilson Anton F. Post Sharon E. Stammerjohn Matthew Erickson SangHoon Lee Kate E. Lowry Robert M. Sherrell Patricia L. Yager 2015-04-01T00:00:00Z https://doi.org/10.12952/journal.elementa.000046 https://doaj.org/article/1bd32d8facaf4bc598b64db9a37b0f64 EN eng BioOne http://elementascience.org/article/info:doi/10.12952/journal.elementa.000046 https://doaj.org/toc/2325-1026 2325-1026 doi:10.12952/journal.elementa.000046 https://doaj.org/article/1bd32d8facaf4bc598b64db9a37b0f64 Elementa: Science of the Anthropocene (2015) Antarctica Sediment trap Amundsen Sea Environmental sciences GE1-350 article 2015 ftdoajarticles https://doi.org/10.12952/journal.elementa.000046 2022-12-31T05:10:40Z Abstract We report results from a yearlong, moored sediment trap in the Amundsen Sea Polynya (ASP), the first such time series in this remote and productive ecosystem. Results are compared to a long-term (1992–2013) time series from the western Antarctic Peninsula (WAP). The ASP trap was deployed from December 2010 to December 2011 at 350 m depth. We observed two brief, but high flux events, peaking at 8 and 5 mmol C m−2 d−1 in January and December 2011, respectively, with a total annual capture of 315 mmol C m−2. Both peak fluxes and annual capture exceeded the comparable WAP observations. Like the overlying phytoplankton bloom observed during the cruise in the ASP (December 2010 to January 2011), particle flux was dominated by Phaeocystis antarctica, which produced phytodetrital aggregates. Particles at the start of the bloom were highly depleted in 13C, indicating their origin in the cold, CO2-rich winter waters exposed by retreating sea ice. As the bloom progressed, microscope visualization and stable isotopic composition provided evidence for an increasing contribution by zooplankton fecal material. Incubation experiments and zooplankton observations suggested that fecal pellet production likely contributed 10–40% of the total flux during the first flux event, and could be very high during episodic krill swarms. Independent estimates of export from the surface (100 m) were about 5–10 times that captured in the trap at 350 m. Estimated bacterial respiration was sufficient to account for much of the decline in the flux between 50 and 350 m, whereas zooplankton respiration was much lower. The ASP system appears to export only a small fraction of its production deeper than 350 m within the polynya region. The export efficiency was comparable to other polar regions where phytoplankton blooms were not dominated by diatoms. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice Directory of Open Access Journals: DOAJ Articles Amundsen Sea Antarctic Antarctic Peninsula Elementa: Science of the Anthropocene 3 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctica Sediment trap Amundsen Sea Environmental sciences GE1-350 |
spellingShingle |
Antarctica Sediment trap Amundsen Sea Environmental sciences GE1-350 Hugh W. Ducklow Stephanie E. Wilson Anton F. Post Sharon E. Stammerjohn Matthew Erickson SangHoon Lee Kate E. Lowry Robert M. Sherrell Patricia L. Yager Particle flux on the continental shelf in the Amundsen Sea Polynya and Western Antarctic Peninsula |
topic_facet |
Antarctica Sediment trap Amundsen Sea Environmental sciences GE1-350 |
description |
Abstract We report results from a yearlong, moored sediment trap in the Amundsen Sea Polynya (ASP), the first such time series in this remote and productive ecosystem. Results are compared to a long-term (1992–2013) time series from the western Antarctic Peninsula (WAP). The ASP trap was deployed from December 2010 to December 2011 at 350 m depth. We observed two brief, but high flux events, peaking at 8 and 5 mmol C m−2 d−1 in January and December 2011, respectively, with a total annual capture of 315 mmol C m−2. Both peak fluxes and annual capture exceeded the comparable WAP observations. Like the overlying phytoplankton bloom observed during the cruise in the ASP (December 2010 to January 2011), particle flux was dominated by Phaeocystis antarctica, which produced phytodetrital aggregates. Particles at the start of the bloom were highly depleted in 13C, indicating their origin in the cold, CO2-rich winter waters exposed by retreating sea ice. As the bloom progressed, microscope visualization and stable isotopic composition provided evidence for an increasing contribution by zooplankton fecal material. Incubation experiments and zooplankton observations suggested that fecal pellet production likely contributed 10–40% of the total flux during the first flux event, and could be very high during episodic krill swarms. Independent estimates of export from the surface (100 m) were about 5–10 times that captured in the trap at 350 m. Estimated bacterial respiration was sufficient to account for much of the decline in the flux between 50 and 350 m, whereas zooplankton respiration was much lower. The ASP system appears to export only a small fraction of its production deeper than 350 m within the polynya region. The export efficiency was comparable to other polar regions where phytoplankton blooms were not dominated by diatoms. |
format |
Article in Journal/Newspaper |
author |
Hugh W. Ducklow Stephanie E. Wilson Anton F. Post Sharon E. Stammerjohn Matthew Erickson SangHoon Lee Kate E. Lowry Robert M. Sherrell Patricia L. Yager |
author_facet |
Hugh W. Ducklow Stephanie E. Wilson Anton F. Post Sharon E. Stammerjohn Matthew Erickson SangHoon Lee Kate E. Lowry Robert M. Sherrell Patricia L. Yager |
author_sort |
Hugh W. Ducklow |
title |
Particle flux on the continental shelf in the Amundsen Sea Polynya and Western Antarctic Peninsula |
title_short |
Particle flux on the continental shelf in the Amundsen Sea Polynya and Western Antarctic Peninsula |
title_full |
Particle flux on the continental shelf in the Amundsen Sea Polynya and Western Antarctic Peninsula |
title_fullStr |
Particle flux on the continental shelf in the Amundsen Sea Polynya and Western Antarctic Peninsula |
title_full_unstemmed |
Particle flux on the continental shelf in the Amundsen Sea Polynya and Western Antarctic Peninsula |
title_sort |
particle flux on the continental shelf in the amundsen sea polynya and western antarctic peninsula |
publisher |
BioOne |
publishDate |
2015 |
url |
https://doi.org/10.12952/journal.elementa.000046 https://doaj.org/article/1bd32d8facaf4bc598b64db9a37b0f64 |
geographic |
Amundsen Sea Antarctic Antarctic Peninsula |
geographic_facet |
Amundsen Sea Antarctic Antarctic Peninsula |
genre |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice |
op_source |
Elementa: Science of the Anthropocene (2015) |
op_relation |
http://elementascience.org/article/info:doi/10.12952/journal.elementa.000046 https://doaj.org/toc/2325-1026 2325-1026 doi:10.12952/journal.elementa.000046 https://doaj.org/article/1bd32d8facaf4bc598b64db9a37b0f64 |
op_doi |
https://doi.org/10.12952/journal.elementa.000046 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
3 |
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1766375694437187584 |