Photosynthetic production in the central Arctic Ocean during the record sea-ice minimum in 2012
The ice-covered central Arctic Ocean is characterized by low primary productivity due to light and nutrient limitations. The recent reduction in ice cover has the potential to substantially increase phytoplankton primary production, but little is yet known about the fate of the ice-associated primar...
Published in: | Biogeosciences |
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Language: | English |
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Copernicus Publications
2015
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00016284 2023-05-15T14:49:54+02:00 Photosynthetic production in the central Arctic Ocean during the record sea-ice minimum in 2012 Fernández-Méndez, M. Katlein, C. Rabe, B. Nicolaus, M. Peeken, I. Bakker, K. Flores, H. Boetius, A. 2015-06 electronic https://doi.org/10.5194/bg-12-3525-2015 https://noa.gwlb.de/receive/cop_mods_00016284 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016239/bg-12-3525-2015.pdf https://bg.copernicus.org/articles/12/3525/2015/bg-12-3525-2015.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-12-3525-2015 https://noa.gwlb.de/receive/cop_mods_00016284 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016239/bg-12-3525-2015.pdf https://bg.copernicus.org/articles/12/3525/2015/bg-12-3525-2015.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2015 ftnonlinearchiv https://doi.org/10.5194/bg-12-3525-2015 2022-02-08T22:54:15Z The ice-covered central Arctic Ocean is characterized by low primary productivity due to light and nutrient limitations. The recent reduction in ice cover has the potential to substantially increase phytoplankton primary production, but little is yet known about the fate of the ice-associated primary production and of the nutrient supply with increasing warming. This study presents results from the central Arctic Ocean collected during summer 2012, when sea-ice extent reached its lowest ever recorded since the onset of satellite observations. Net primary productivity (NPP) was measured in the water column, sea ice and melt ponds by 14CO2 uptake at different irradiances. Photosynthesis vs. irradiance (PI) curves were established in laboratory experiments and used to upscale measured NPP to the deep Eurasian Basin (north of 78° N) using the irradiance-based Central Arctic Ocean Primary Productivity (CAOPP) model. In addition, new annual production has been calculated from the seasonal nutrient drawdown in the mixed layer since last winter. Results show that ice algae can contribute up to 60% to primary production in the central Arctic Ocean at the end of the productive season (August–September). The ice-covered water column has lower NPP rates than open water due to light limitation in late summer. As indicated by the nutrient ratios in the euphotic zone, nitrate was limiting primary production in the deep Eurasian Basin close to the Laptev Sea area, while silicate was the main limiting nutrient at the ice margin near the Atlantic inflow. Although sea-ice cover was substantially reduced in 2012, total annual new production in the Eurasian Basin was 17 ± 7 Tg C yr−1, which is within the range of estimates of previous years. However, when adding the contribution by sub-ice algae, the annual production for the deep Eurasian Basin (north of 78° N) could double previous estimates for that area with a surplus of 16 Tg C yr−1. Our data suggest that sub-ice algae are an important component of the productivity in the ice-covered Eurasian Basin of the central Arctic Ocean. It remains an important question whether their contribution to productivity is on the rise with thinning ice, or whether it will decline due to overall sea-ice retreat and be replaced by phytoplankton. Article in Journal/Newspaper Arctic Arctic Ocean ice algae laptev Laptev Sea Phytoplankton Sea ice Niedersächsisches Online-Archiv NOA Arctic Arctic Ocean Laptev Sea Biogeosciences 12 11 3525 3549 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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language |
English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Fernández-Méndez, M. Katlein, C. Rabe, B. Nicolaus, M. Peeken, I. Bakker, K. Flores, H. Boetius, A. Photosynthetic production in the central Arctic Ocean during the record sea-ice minimum in 2012 |
topic_facet |
article Verlagsveröffentlichung |
description |
The ice-covered central Arctic Ocean is characterized by low primary productivity due to light and nutrient limitations. The recent reduction in ice cover has the potential to substantially increase phytoplankton primary production, but little is yet known about the fate of the ice-associated primary production and of the nutrient supply with increasing warming. This study presents results from the central Arctic Ocean collected during summer 2012, when sea-ice extent reached its lowest ever recorded since the onset of satellite observations. Net primary productivity (NPP) was measured in the water column, sea ice and melt ponds by 14CO2 uptake at different irradiances. Photosynthesis vs. irradiance (PI) curves were established in laboratory experiments and used to upscale measured NPP to the deep Eurasian Basin (north of 78° N) using the irradiance-based Central Arctic Ocean Primary Productivity (CAOPP) model. In addition, new annual production has been calculated from the seasonal nutrient drawdown in the mixed layer since last winter. Results show that ice algae can contribute up to 60% to primary production in the central Arctic Ocean at the end of the productive season (August–September). The ice-covered water column has lower NPP rates than open water due to light limitation in late summer. As indicated by the nutrient ratios in the euphotic zone, nitrate was limiting primary production in the deep Eurasian Basin close to the Laptev Sea area, while silicate was the main limiting nutrient at the ice margin near the Atlantic inflow. Although sea-ice cover was substantially reduced in 2012, total annual new production in the Eurasian Basin was 17 ± 7 Tg C yr−1, which is within the range of estimates of previous years. However, when adding the contribution by sub-ice algae, the annual production for the deep Eurasian Basin (north of 78° N) could double previous estimates for that area with a surplus of 16 Tg C yr−1. Our data suggest that sub-ice algae are an important component of the productivity in the ice-covered Eurasian Basin of the central Arctic Ocean. It remains an important question whether their contribution to productivity is on the rise with thinning ice, or whether it will decline due to overall sea-ice retreat and be replaced by phytoplankton. |
format |
Article in Journal/Newspaper |
author |
Fernández-Méndez, M. Katlein, C. Rabe, B. Nicolaus, M. Peeken, I. Bakker, K. Flores, H. Boetius, A. |
author_facet |
Fernández-Méndez, M. Katlein, C. Rabe, B. Nicolaus, M. Peeken, I. Bakker, K. Flores, H. Boetius, A. |
author_sort |
Fernández-Méndez, M. |
title |
Photosynthetic production in the central Arctic Ocean during the record sea-ice minimum in 2012 |
title_short |
Photosynthetic production in the central Arctic Ocean during the record sea-ice minimum in 2012 |
title_full |
Photosynthetic production in the central Arctic Ocean during the record sea-ice minimum in 2012 |
title_fullStr |
Photosynthetic production in the central Arctic Ocean during the record sea-ice minimum in 2012 |
title_full_unstemmed |
Photosynthetic production in the central Arctic Ocean during the record sea-ice minimum in 2012 |
title_sort |
photosynthetic production in the central arctic ocean during the record sea-ice minimum in 2012 |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-3525-2015 https://noa.gwlb.de/receive/cop_mods_00016284 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016239/bg-12-3525-2015.pdf https://bg.copernicus.org/articles/12/3525/2015/bg-12-3525-2015.pdf |
geographic |
Arctic Arctic Ocean Laptev Sea |
geographic_facet |
Arctic Arctic Ocean Laptev Sea |
genre |
Arctic Arctic Ocean ice algae laptev Laptev Sea Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Ocean ice algae laptev Laptev Sea Phytoplankton Sea ice |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-12-3525-2015 https://noa.gwlb.de/receive/cop_mods_00016284 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016239/bg-12-3525-2015.pdf https://bg.copernicus.org/articles/12/3525/2015/bg-12-3525-2015.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-12-3525-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
11 |
container_start_page |
3525 |
op_container_end_page |
3549 |
_version_ |
1766320980566736896 |