Benthic primary production and mineralization in a High Arctic fjord:in situ assessments by aquatic eddy covariance
Coastal and shelf systems likely exert major influence on Arctic Ocean functioning, yet key ecosystem processes remain poorly quantified. We employed the aquatic eddy covariance (AEC) oxygen (O2) flux method to estimate benthic primary production and mineralization in a High Arctic Greenland fjord....
Published in: | Marine Ecology Progress Series |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2016
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Online Access: | https://portal.findresearcher.sdu.dk/da/publications/522bf70d-e798-4dc6-b605-6e14e08eb3b2 https://doi.org/10.3354/meps11780 |
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ftsydanskunivpub:oai:sdu.dk:publications/522bf70d-e798-4dc6-b605-6e14e08eb3b2 2024-06-23T07:48:31+00:00 Benthic primary production and mineralization in a High Arctic fjord:in situ assessments by aquatic eddy covariance Attard, Karl Hancke, Kasper Sejr, Mikael K. Glud, Ronnie N. 2016-07-28 https://portal.findresearcher.sdu.dk/da/publications/522bf70d-e798-4dc6-b605-6e14e08eb3b2 https://doi.org/10.3354/meps11780 eng eng https://portal.findresearcher.sdu.dk/da/publications/522bf70d-e798-4dc6-b605-6e14e08eb3b2 info:eu-repo/semantics/restrictedAccess Attard , K , Hancke , K , Sejr , M K & Glud , R N 2016 , ' Benthic primary production and mineralization in a High Arctic fjord : in situ assessments by aquatic eddy covariance ' , Marine Ecology - Progress Series , vol. 554 , pp. 35-50 . https://doi.org/10.3354/meps11780 Benthic primary production carbon cycling Arctic Aquatic eddy covariance Benthic macrofauna article 2016 ftsydanskunivpub https://doi.org/10.3354/meps11780 2024-06-11T14:20:39Z Coastal and shelf systems likely exert major influence on Arctic Ocean functioning, yet key ecosystem processes remain poorly quantified. We employed the aquatic eddy covariance (AEC) oxygen (O2) flux method to estimate benthic primary production and mineralization in a High Arctic Greenland fjord. Seabed gross primary production (GPP) within the 40 m deep photic zone was highest at 10 m (29 mmol O2 m−2 d−1) and decreased to 5 mmol O2 m−2 d−1 at 40 m, while nighttime community respiration (CR) ranged from 11 to 25 mmol O2m−2 d−1. CR decreased to ~2.5 mmol O2m−2 d−1 at 80 m and remained constant with further depth. Fauna activity accounted for ~50% of the CR at depths ≤60 m but was <15% at depths ≥80 m. Benthic GPP and CR were comparable when scaled to the outer fjord area ≤40 m depth (2.7 and 3.1 t C d−1), and here the seabed was twice as important as the pelagic compartment for primary production. However, when scaled to the entire outer fjord area of which 80% is >40 m, benthic GPP was 26% of the pelagic production. CR was 2-fold higher than GPP over this region (5.7 t C d−1) and thus net heterotrophic. By scaling AEC-derived Arctic benthic GPP to the entire Arctic Ocean using modelled seabed light data, we estimate an annual Arctic Ocean benthic GPP of 11.5 × 107 t C yr−1. On average, this value represents 26% of the Arctic Ocean annual net phytoplankton production estimates. This scarcely considered component is thus potentially important for contemporary and future Arctic ecosystem functioning. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Greenland Phytoplankton University of Southern Denmark Research Portal Arctic Arctic Ocean Greenland Marine Ecology Progress Series 554 35 50 |
institution |
Open Polar |
collection |
University of Southern Denmark Research Portal |
op_collection_id |
ftsydanskunivpub |
language |
English |
topic |
Benthic primary production carbon cycling Arctic Aquatic eddy covariance Benthic macrofauna |
spellingShingle |
Benthic primary production carbon cycling Arctic Aquatic eddy covariance Benthic macrofauna Attard, Karl Hancke, Kasper Sejr, Mikael K. Glud, Ronnie N. Benthic primary production and mineralization in a High Arctic fjord:in situ assessments by aquatic eddy covariance |
topic_facet |
Benthic primary production carbon cycling Arctic Aquatic eddy covariance Benthic macrofauna |
description |
Coastal and shelf systems likely exert major influence on Arctic Ocean functioning, yet key ecosystem processes remain poorly quantified. We employed the aquatic eddy covariance (AEC) oxygen (O2) flux method to estimate benthic primary production and mineralization in a High Arctic Greenland fjord. Seabed gross primary production (GPP) within the 40 m deep photic zone was highest at 10 m (29 mmol O2 m−2 d−1) and decreased to 5 mmol O2 m−2 d−1 at 40 m, while nighttime community respiration (CR) ranged from 11 to 25 mmol O2m−2 d−1. CR decreased to ~2.5 mmol O2m−2 d−1 at 80 m and remained constant with further depth. Fauna activity accounted for ~50% of the CR at depths ≤60 m but was <15% at depths ≥80 m. Benthic GPP and CR were comparable when scaled to the outer fjord area ≤40 m depth (2.7 and 3.1 t C d−1), and here the seabed was twice as important as the pelagic compartment for primary production. However, when scaled to the entire outer fjord area of which 80% is >40 m, benthic GPP was 26% of the pelagic production. CR was 2-fold higher than GPP over this region (5.7 t C d−1) and thus net heterotrophic. By scaling AEC-derived Arctic benthic GPP to the entire Arctic Ocean using modelled seabed light data, we estimate an annual Arctic Ocean benthic GPP of 11.5 × 107 t C yr−1. On average, this value represents 26% of the Arctic Ocean annual net phytoplankton production estimates. This scarcely considered component is thus potentially important for contemporary and future Arctic ecosystem functioning. |
format |
Article in Journal/Newspaper |
author |
Attard, Karl Hancke, Kasper Sejr, Mikael K. Glud, Ronnie N. |
author_facet |
Attard, Karl Hancke, Kasper Sejr, Mikael K. Glud, Ronnie N. |
author_sort |
Attard, Karl |
title |
Benthic primary production and mineralization in a High Arctic fjord:in situ assessments by aquatic eddy covariance |
title_short |
Benthic primary production and mineralization in a High Arctic fjord:in situ assessments by aquatic eddy covariance |
title_full |
Benthic primary production and mineralization in a High Arctic fjord:in situ assessments by aquatic eddy covariance |
title_fullStr |
Benthic primary production and mineralization in a High Arctic fjord:in situ assessments by aquatic eddy covariance |
title_full_unstemmed |
Benthic primary production and mineralization in a High Arctic fjord:in situ assessments by aquatic eddy covariance |
title_sort |
benthic primary production and mineralization in a high arctic fjord:in situ assessments by aquatic eddy covariance |
publishDate |
2016 |
url |
https://portal.findresearcher.sdu.dk/da/publications/522bf70d-e798-4dc6-b605-6e14e08eb3b2 https://doi.org/10.3354/meps11780 |
geographic |
Arctic Arctic Ocean Greenland |
geographic_facet |
Arctic Arctic Ocean Greenland |
genre |
Arctic Arctic Arctic Ocean Greenland Phytoplankton |
genre_facet |
Arctic Arctic Arctic Ocean Greenland Phytoplankton |
op_source |
Attard , K , Hancke , K , Sejr , M K & Glud , R N 2016 , ' Benthic primary production and mineralization in a High Arctic fjord : in situ assessments by aquatic eddy covariance ' , Marine Ecology - Progress Series , vol. 554 , pp. 35-50 . https://doi.org/10.3354/meps11780 |
op_relation |
https://portal.findresearcher.sdu.dk/da/publications/522bf70d-e798-4dc6-b605-6e14e08eb3b2 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.3354/meps11780 |
container_title |
Marine Ecology Progress Series |
container_volume |
554 |
container_start_page |
35 |
op_container_end_page |
50 |
_version_ |
1802638903750950912 |