Oxygen fluxes beneath Arctic land-fast ice and pack ice: towards estimates of ice productivity
Sea-ice ecosystems are among the most extensive of Earth's habitats; yet its autotrophic and heterotrophic activities remain poorly constrained. We employed the in situ aquatic eddy-covariance (AEC) O-2 flux method and laboratory incubation techniques ((HCO3-)-C-14, [H-3] thymidine and [H-3] le...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/251199 2024-01-07T09:40:43+01:00 Oxygen fluxes beneath Arctic land-fast ice and pack ice: towards estimates of ice productivity Attard, Karl M. Søgaard, Dorte H. Piontek, Judith Lange, Benjamin A. Katlein, Christian Sørensen, Heidi L. McGinnis, Daniel F. Rovelli, Lorenzo Rysgaard, Søren Wenzhöfer, Frank Glud, Ronnie N. Ecosystems and Environment Research Programme Tvärminne Zoological Station Marine Ecosystems Research Group Tvärminne Benthic Ecology Team 2018-10-18T10:26:01Z 16 application/pdf http://hdl.handle.net/10138/251199 eng eng Springer 10.1007/s00300-018-2350-1 Attard , K M , Søgaard , D H , Piontek , J , Lange , B A , Katlein , C , Sørensen , H L , McGinnis , D F , Rovelli , L , Rysgaard , S , Wenzhöfer , F & Glud , R N 2018 , ' Oxygen fluxes beneath Arctic land-fast ice and pack ice: towards estimates of ice productivity ' , Polar Biology , vol. 41 , no. 10 , pp. 2119-2134 . https://doi.org/10.1007/s00300-018-2350-1 RIS: urn:6881536A4F2E214A09453AE2E04F6CDD RIS: Attard2018 ORCID: /0000-0002-8009-5462/work/49703189 85048370474 f8041018-ec86-48d8-901e-1d7a0a8a6e0a http://hdl.handle.net/10138/251199 000445212100017 cc_by openAccess info:eu-repo/semantics/openAccess 1172 Environmental sciences 1171 Geosciences Sea-ice Primary production Bacterial production Carbon cycling Eddy-covariance AQUATIC EDDY-CORRELATION MELTING SEA-ICE HETEROTROPHIC ACTIVITY PERMEABLE SEDIMENTS O-2 MICROSENSORS DISSOLVED-OXYGEN PAM FLUOROMETER FRAM STRAIT UPPER OCEAN HEAT-FLUX Article publishedVersion 2018 ftunivhelsihelda 2023-12-14T00:09:02Z Sea-ice ecosystems are among the most extensive of Earth's habitats; yet its autotrophic and heterotrophic activities remain poorly constrained. We employed the in situ aquatic eddy-covariance (AEC) O-2 flux method and laboratory incubation techniques ((HCO3-)-C-14, [H-3] thymidine and [H-3] leucine) to assess productivity in Arctic sea-ice using different methods, in conditions ranging from land-fast ice during winter, to pack ice within the central Arctic Ocean during summer. Laboratory tracer measurements resolved rates of bacterial C demand of 0.003-0.166mmolCm(-2)day(-1) and primary productivity rates of 0.008-0.125mmolCm(-2)day(-1) for the different ice floes. Pack ice in the central Arctic Ocean was overall net autotrophic (0.002-0.063mmolCm(-2)day(-1)), whereas winter land-fast ice was net heterotrophic (-0.155mmol C m(-2) day(-1)). AEC measurements resolved an uptake of O-2 by the bottom-ice environment, from similar to-2mmolO(2)m(-2) day(-1) under winter land-fast ice to similar to-6mmolO(2)m(-2)day(-1) under summer pack ice. Flux of O-2-deplete meltwater and changes in water flow velocity masked potential biological-mediated activity. AEC estimates of primary productivity were only possible at one study location. Here, productivity rates of 1.3 +/- 0.9mmolO(2)m(-2)day(-1), much larger than concurrent laboratory tracer estimates (0.03mmolCm(-2)day(-1)), indicate that ice algal production and its importance within the marine Arctic could be underestimated using traditional approaches. Given careful flux interpretation and with further development, the AEC technique represents a promising new tool for assessing oxygen dynamics and sea-ice productivity in ice-covered regions. Peer reviewed Article in Journal/Newspaper Arctic Arctic Arctic Ocean Fram Strait Polar Biology Sea ice HELDA – University of Helsinki Open Repository Arctic Arctic Ocean Polar Biology 41 10 2119 2134 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
1172 Environmental sciences 1171 Geosciences Sea-ice Primary production Bacterial production Carbon cycling Eddy-covariance AQUATIC EDDY-CORRELATION MELTING SEA-ICE HETEROTROPHIC ACTIVITY PERMEABLE SEDIMENTS O-2 MICROSENSORS DISSOLVED-OXYGEN PAM FLUOROMETER FRAM STRAIT UPPER OCEAN HEAT-FLUX |
spellingShingle |
1172 Environmental sciences 1171 Geosciences Sea-ice Primary production Bacterial production Carbon cycling Eddy-covariance AQUATIC EDDY-CORRELATION MELTING SEA-ICE HETEROTROPHIC ACTIVITY PERMEABLE SEDIMENTS O-2 MICROSENSORS DISSOLVED-OXYGEN PAM FLUOROMETER FRAM STRAIT UPPER OCEAN HEAT-FLUX Attard, Karl M. Søgaard, Dorte H. Piontek, Judith Lange, Benjamin A. Katlein, Christian Sørensen, Heidi L. McGinnis, Daniel F. Rovelli, Lorenzo Rysgaard, Søren Wenzhöfer, Frank Glud, Ronnie N. Oxygen fluxes beneath Arctic land-fast ice and pack ice: towards estimates of ice productivity |
topic_facet |
1172 Environmental sciences 1171 Geosciences Sea-ice Primary production Bacterial production Carbon cycling Eddy-covariance AQUATIC EDDY-CORRELATION MELTING SEA-ICE HETEROTROPHIC ACTIVITY PERMEABLE SEDIMENTS O-2 MICROSENSORS DISSOLVED-OXYGEN PAM FLUOROMETER FRAM STRAIT UPPER OCEAN HEAT-FLUX |
description |
Sea-ice ecosystems are among the most extensive of Earth's habitats; yet its autotrophic and heterotrophic activities remain poorly constrained. We employed the in situ aquatic eddy-covariance (AEC) O-2 flux method and laboratory incubation techniques ((HCO3-)-C-14, [H-3] thymidine and [H-3] leucine) to assess productivity in Arctic sea-ice using different methods, in conditions ranging from land-fast ice during winter, to pack ice within the central Arctic Ocean during summer. Laboratory tracer measurements resolved rates of bacterial C demand of 0.003-0.166mmolCm(-2)day(-1) and primary productivity rates of 0.008-0.125mmolCm(-2)day(-1) for the different ice floes. Pack ice in the central Arctic Ocean was overall net autotrophic (0.002-0.063mmolCm(-2)day(-1)), whereas winter land-fast ice was net heterotrophic (-0.155mmol C m(-2) day(-1)). AEC measurements resolved an uptake of O-2 by the bottom-ice environment, from similar to-2mmolO(2)m(-2) day(-1) under winter land-fast ice to similar to-6mmolO(2)m(-2)day(-1) under summer pack ice. Flux of O-2-deplete meltwater and changes in water flow velocity masked potential biological-mediated activity. AEC estimates of primary productivity were only possible at one study location. Here, productivity rates of 1.3 +/- 0.9mmolO(2)m(-2)day(-1), much larger than concurrent laboratory tracer estimates (0.03mmolCm(-2)day(-1)), indicate that ice algal production and its importance within the marine Arctic could be underestimated using traditional approaches. Given careful flux interpretation and with further development, the AEC technique represents a promising new tool for assessing oxygen dynamics and sea-ice productivity in ice-covered regions. Peer reviewed |
author2 |
Ecosystems and Environment Research Programme Tvärminne Zoological Station Marine Ecosystems Research Group Tvärminne Benthic Ecology Team |
format |
Article in Journal/Newspaper |
author |
Attard, Karl M. Søgaard, Dorte H. Piontek, Judith Lange, Benjamin A. Katlein, Christian Sørensen, Heidi L. McGinnis, Daniel F. Rovelli, Lorenzo Rysgaard, Søren Wenzhöfer, Frank Glud, Ronnie N. |
author_facet |
Attard, Karl M. Søgaard, Dorte H. Piontek, Judith Lange, Benjamin A. Katlein, Christian Sørensen, Heidi L. McGinnis, Daniel F. Rovelli, Lorenzo Rysgaard, Søren Wenzhöfer, Frank Glud, Ronnie N. |
author_sort |
Attard, Karl M. |
title |
Oxygen fluxes beneath Arctic land-fast ice and pack ice: towards estimates of ice productivity |
title_short |
Oxygen fluxes beneath Arctic land-fast ice and pack ice: towards estimates of ice productivity |
title_full |
Oxygen fluxes beneath Arctic land-fast ice and pack ice: towards estimates of ice productivity |
title_fullStr |
Oxygen fluxes beneath Arctic land-fast ice and pack ice: towards estimates of ice productivity |
title_full_unstemmed |
Oxygen fluxes beneath Arctic land-fast ice and pack ice: towards estimates of ice productivity |
title_sort |
oxygen fluxes beneath arctic land-fast ice and pack ice: towards estimates of ice productivity |
publisher |
Springer |
publishDate |
2018 |
url |
http://hdl.handle.net/10138/251199 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean Fram Strait Polar Biology Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Fram Strait Polar Biology Sea ice |
op_relation |
10.1007/s00300-018-2350-1 Attard , K M , Søgaard , D H , Piontek , J , Lange , B A , Katlein , C , Sørensen , H L , McGinnis , D F , Rovelli , L , Rysgaard , S , Wenzhöfer , F & Glud , R N 2018 , ' Oxygen fluxes beneath Arctic land-fast ice and pack ice: towards estimates of ice productivity ' , Polar Biology , vol. 41 , no. 10 , pp. 2119-2134 . https://doi.org/10.1007/s00300-018-2350-1 RIS: urn:6881536A4F2E214A09453AE2E04F6CDD RIS: Attard2018 ORCID: /0000-0002-8009-5462/work/49703189 85048370474 f8041018-ec86-48d8-901e-1d7a0a8a6e0a http://hdl.handle.net/10138/251199 000445212100017 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
container_title |
Polar Biology |
container_volume |
41 |
container_issue |
10 |
container_start_page |
2119 |
op_container_end_page |
2134 |
_version_ |
1787421528893161472 |