A carbon budget for the Amundsen Sea Polynya, Antarctica : Estimating net community production and export in a highly productive polar ecosystem
Polynyas, or recurring areas of seasonally open water surrounded by sea ice, are foci for energy and material transfer between the atmosphere and the polar ocean. They are also climate sensitive, with both sea ice extent and glacial melt influencing their productivity. The Amundsen Sea Polynya (ASP)...
Published in: | Elementa: Science of the Anthropocene |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Linnéuniversitetet, Institutionen för biologi och miljö (BOM)
2016
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-70979 https://doi.org/10.12952/journal.elementa.000140 |
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ftlinnaeusuniv:oai:DiVA.org:lnu-70979 2024-09-09T18:59:54+00:00 A carbon budget for the Amundsen Sea Polynya, Antarctica : Estimating net community production and export in a highly productive polar ecosystem Yager, P. L. Sherrell, R. M. Stammerjohn, S. E. Ducklow, H. W. Schofield, O. M. E. Ingall, E. D. Wilson, S. E. Lowry, K. E. Williams, C. M. Riemann, Lasse Bertilsson, S. Alderkamp, A-C Dinasquet, Julie Logares, R. Richert, I. Sipler, R. E. Melara, A. J. Mu, L. Newstead, R. G. Post, A. F. Swalethorp, R. van Dijken, G. L. 2016 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-70979 https://doi.org/10.12952/journal.elementa.000140 eng eng Linnéuniversitetet, Institutionen för biologi och miljö (BOM) Univ Georgia, USA Rutgers State Univ, USA Univ Colorado, USA Columbia Univ, USA Georgia Inst Technol, USA Bangor Univ, UK Stanford Univ, USA Univ Copenhagen, Denmark Uppsala University CSIC, Spain Coll William & Mary, USA Florida Atlantic Univ, USA Tech Univ Denmark, Denmark;University of Gothenburg Elementa : Science of the Anthropocene, 2016, 4, http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-70979 doi:10.12952/journal.elementa.000140 ISI:000389924300002 info:eu-repo/semantics/openAccess Ecology Ekologi Article in journal info:eu-repo/semantics/article text 2016 ftlinnaeusuniv https://doi.org/10.12952/journal.elementa.000140 2024-07-09T14:06:23Z Polynyas, or recurring areas of seasonally open water surrounded by sea ice, are foci for energy and material transfer between the atmosphere and the polar ocean. They are also climate sensitive, with both sea ice extent and glacial melt influencing their productivity. The Amundsen Sea Polynya (ASP) is the greenest polynya in the Southern Ocean, with summertime chlorophyll a concentrations exceeding 20 mu g L-1. During the Amundsen Sea Polynya International Research Expedition (ASPIRE) in austral summer 2010-11, we aimed to determine the fate of this high algal productivity. We collected water column profiles for total dissolved inorganic carbon (DIC) and nutrients, particulate and dissolved organic matter, chlorophyll a, mesozoo-plankton, and microbial biomass to make a carbon budget for this ecosystem. We also measured primary and secondary production, community respiration rates, vertical particle flux and fecal pellet production and grazing. With observations arranged along a gradient of increasing integrated dissolved inorganic nitrogen drawdown (Delta DIN; 0.027-0.74 mol N m(-2)), changes in DIC in the upper water column (ranging from 0.2 to 4.7 mol C m(-2)) and gas exchange (0-1.7 mol C m(-2)) were combined to estimate early season net community production (sNCP; 0.2-5.9 mol C m(-2)) and then compared to organic matter inventories to estimate export. From a phytoplankton bloom dominated by Phaeocystis antarctica, a high fraction (up to similar to 60%) of sNCP was exported to sub-euphotic depths. Microbial respiration remineralized much of this export in the mid waters. Comparisons to short-term (2-3 days) drifting traps and a year-long moored sediment trap capturing the downward flux confirmed that a relatively high fraction (3-6%) of the export from similar to 100 m made it through the mid waters to depth. We discuss the climate-sensitive nature of these carbon fluxes, in light of the changing sea ice cover and melting ice sheets in the region. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctica Sea ice Southern Ocean Linnaeus University Kalmar Växjö: Publications (DiVA) Amundsen Sea Austral Southern Ocean Elementa: Science of the Anthropocene 4 |
institution |
Open Polar |
collection |
Linnaeus University Kalmar Växjö: Publications (DiVA) |
op_collection_id |
ftlinnaeusuniv |
language |
English |
topic |
Ecology Ekologi |
spellingShingle |
Ecology Ekologi Yager, P. L. Sherrell, R. M. Stammerjohn, S. E. Ducklow, H. W. Schofield, O. M. E. Ingall, E. D. Wilson, S. E. Lowry, K. E. Williams, C. M. Riemann, Lasse Bertilsson, S. Alderkamp, A-C Dinasquet, Julie Logares, R. Richert, I. Sipler, R. E. Melara, A. J. Mu, L. Newstead, R. G. Post, A. F. Swalethorp, R. van Dijken, G. L. A carbon budget for the Amundsen Sea Polynya, Antarctica : Estimating net community production and export in a highly productive polar ecosystem |
topic_facet |
Ecology Ekologi |
description |
Polynyas, or recurring areas of seasonally open water surrounded by sea ice, are foci for energy and material transfer between the atmosphere and the polar ocean. They are also climate sensitive, with both sea ice extent and glacial melt influencing their productivity. The Amundsen Sea Polynya (ASP) is the greenest polynya in the Southern Ocean, with summertime chlorophyll a concentrations exceeding 20 mu g L-1. During the Amundsen Sea Polynya International Research Expedition (ASPIRE) in austral summer 2010-11, we aimed to determine the fate of this high algal productivity. We collected water column profiles for total dissolved inorganic carbon (DIC) and nutrients, particulate and dissolved organic matter, chlorophyll a, mesozoo-plankton, and microbial biomass to make a carbon budget for this ecosystem. We also measured primary and secondary production, community respiration rates, vertical particle flux and fecal pellet production and grazing. With observations arranged along a gradient of increasing integrated dissolved inorganic nitrogen drawdown (Delta DIN; 0.027-0.74 mol N m(-2)), changes in DIC in the upper water column (ranging from 0.2 to 4.7 mol C m(-2)) and gas exchange (0-1.7 mol C m(-2)) were combined to estimate early season net community production (sNCP; 0.2-5.9 mol C m(-2)) and then compared to organic matter inventories to estimate export. From a phytoplankton bloom dominated by Phaeocystis antarctica, a high fraction (up to similar to 60%) of sNCP was exported to sub-euphotic depths. Microbial respiration remineralized much of this export in the mid waters. Comparisons to short-term (2-3 days) drifting traps and a year-long moored sediment trap capturing the downward flux confirmed that a relatively high fraction (3-6%) of the export from similar to 100 m made it through the mid waters to depth. We discuss the climate-sensitive nature of these carbon fluxes, in light of the changing sea ice cover and melting ice sheets in the region. |
format |
Article in Journal/Newspaper |
author |
Yager, P. L. Sherrell, R. M. Stammerjohn, S. E. Ducklow, H. W. Schofield, O. M. E. Ingall, E. D. Wilson, S. E. Lowry, K. E. Williams, C. M. Riemann, Lasse Bertilsson, S. Alderkamp, A-C Dinasquet, Julie Logares, R. Richert, I. Sipler, R. E. Melara, A. J. Mu, L. Newstead, R. G. Post, A. F. Swalethorp, R. van Dijken, G. L. |
author_facet |
Yager, P. L. Sherrell, R. M. Stammerjohn, S. E. Ducklow, H. W. Schofield, O. M. E. Ingall, E. D. Wilson, S. E. Lowry, K. E. Williams, C. M. Riemann, Lasse Bertilsson, S. Alderkamp, A-C Dinasquet, Julie Logares, R. Richert, I. Sipler, R. E. Melara, A. J. Mu, L. Newstead, R. G. Post, A. F. Swalethorp, R. van Dijken, G. L. |
author_sort |
Yager, P. L. |
title |
A carbon budget for the Amundsen Sea Polynya, Antarctica : Estimating net community production and export in a highly productive polar ecosystem |
title_short |
A carbon budget for the Amundsen Sea Polynya, Antarctica : Estimating net community production and export in a highly productive polar ecosystem |
title_full |
A carbon budget for the Amundsen Sea Polynya, Antarctica : Estimating net community production and export in a highly productive polar ecosystem |
title_fullStr |
A carbon budget for the Amundsen Sea Polynya, Antarctica : Estimating net community production and export in a highly productive polar ecosystem |
title_full_unstemmed |
A carbon budget for the Amundsen Sea Polynya, Antarctica : Estimating net community production and export in a highly productive polar ecosystem |
title_sort |
carbon budget for the amundsen sea polynya, antarctica : estimating net community production and export in a highly productive polar ecosystem |
publisher |
Linnéuniversitetet, Institutionen för biologi och miljö (BOM) |
publishDate |
2016 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-70979 https://doi.org/10.12952/journal.elementa.000140 |
geographic |
Amundsen Sea Austral Southern Ocean |
geographic_facet |
Amundsen Sea Austral Southern Ocean |
genre |
Amundsen Sea Antarc* Antarctica Sea ice Southern Ocean |
genre_facet |
Amundsen Sea Antarc* Antarctica Sea ice Southern Ocean |
op_relation |
Elementa : Science of the Anthropocene, 2016, 4, http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-70979 doi:10.12952/journal.elementa.000140 ISI:000389924300002 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.12952/journal.elementa.000140 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
4 |
_version_ |
1809936135776894976 |