Sea-ice algal primary production and nitrogen uptake rates off East Antarctica
Antarctic pack ice comprises about 90% of the sea ice in the southern hemisphere and plays an important structuring role in Antarctic marine ecosystems, yet measurements of ice algal primary production and nitrogen uptake rates remain scarce. During the early austral spring of 2012, measurements for...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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ftunivtasecite:oai:ecite.utas.edu.au:104046 2023-05-15T14:03:25+02:00 Sea-ice algal primary production and nitrogen uptake rates off East Antarctica Roukaerts, A Cavagna, A-J Fripiat, F Lannuzel, D Meiners, KM Dehairs, F 2015 https://doi.org/10.1016/j.dsr2.2015.08.007 http://ecite.utas.edu.au/104046 en eng Pergamon-Elsevier Science Ltd http://dx.doi.org/10.1016/j.dsr2.2015.08.007 Roukaerts, A and Cavagna, A-J and Fripiat, F and Lannuzel, D and Meiners, KM and Dehairs, F, Sea-ice algal primary production and nitrogen uptake rates off East Antarctica, Deep-Sea Research. Part II, 131 pp. 140-149. ISSN 0967-0645 (2015) [Refereed Article] http://ecite.utas.edu.au/104046 Earth Sciences Oceanography Chemical Oceanography Refereed Article PeerReviewed 2015 ftunivtasecite https://doi.org/10.1016/j.dsr2.2015.08.007 2019-12-13T22:05:26Z Antarctic pack ice comprises about 90% of the sea ice in the southern hemisphere and plays an important structuring role in Antarctic marine ecosystems, yet measurements of ice algal primary production and nitrogen uptake rates remain scarce. During the early austral spring of 2012, measurements for primary production rates and uptake of two nitrogen substrates (nitrate and ammonium) were conducted at 5 stations in the East Antarctic pack ice (6366S, 115125E). Carbon uptake was low (3.52mgCm −2 d −1 ) but a trend of increased production was observed towards the end of the voyage suggesting pre-bloom conditions. Significant snow covers reaching, up to 0.8m, induced strong light limitation. Two different regimes were observed in the ice with primarily nitrate based new production ( f -ratio: 0.800.95) at the bottom of the ice cover, due to nutrient-replete conditions at the icewater interface, and common for pre-bloom conditions. In the sea-ice interior, POC:PN ratios (2070) and higher POC:Chl a ratios suggested the presence of large amounts of detrital material trapped in the ice and here ammonium was the prevailing nitrogen substrate. This suggests that most primary production in the sea-ice interior was regenerated and supported by a microbial food web, recycling detritus. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice eCite UTAS (University of Tasmania) Antarctic Austral East Antarctica Deep Sea Research Part II: Topical Studies in Oceanography 131 140 149 |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Chemical Oceanography |
spellingShingle |
Earth Sciences Oceanography Chemical Oceanography Roukaerts, A Cavagna, A-J Fripiat, F Lannuzel, D Meiners, KM Dehairs, F Sea-ice algal primary production and nitrogen uptake rates off East Antarctica |
topic_facet |
Earth Sciences Oceanography Chemical Oceanography |
description |
Antarctic pack ice comprises about 90% of the sea ice in the southern hemisphere and plays an important structuring role in Antarctic marine ecosystems, yet measurements of ice algal primary production and nitrogen uptake rates remain scarce. During the early austral spring of 2012, measurements for primary production rates and uptake of two nitrogen substrates (nitrate and ammonium) were conducted at 5 stations in the East Antarctic pack ice (6366S, 115125E). Carbon uptake was low (3.52mgCm −2 d −1 ) but a trend of increased production was observed towards the end of the voyage suggesting pre-bloom conditions. Significant snow covers reaching, up to 0.8m, induced strong light limitation. Two different regimes were observed in the ice with primarily nitrate based new production ( f -ratio: 0.800.95) at the bottom of the ice cover, due to nutrient-replete conditions at the icewater interface, and common for pre-bloom conditions. In the sea-ice interior, POC:PN ratios (2070) and higher POC:Chl a ratios suggested the presence of large amounts of detrital material trapped in the ice and here ammonium was the prevailing nitrogen substrate. This suggests that most primary production in the sea-ice interior was regenerated and supported by a microbial food web, recycling detritus. |
format |
Article in Journal/Newspaper |
author |
Roukaerts, A Cavagna, A-J Fripiat, F Lannuzel, D Meiners, KM Dehairs, F |
author_facet |
Roukaerts, A Cavagna, A-J Fripiat, F Lannuzel, D Meiners, KM Dehairs, F |
author_sort |
Roukaerts, A |
title |
Sea-ice algal primary production and nitrogen uptake rates off East Antarctica |
title_short |
Sea-ice algal primary production and nitrogen uptake rates off East Antarctica |
title_full |
Sea-ice algal primary production and nitrogen uptake rates off East Antarctica |
title_fullStr |
Sea-ice algal primary production and nitrogen uptake rates off East Antarctica |
title_full_unstemmed |
Sea-ice algal primary production and nitrogen uptake rates off East Antarctica |
title_sort |
sea-ice algal primary production and nitrogen uptake rates off east antarctica |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2015 |
url |
https://doi.org/10.1016/j.dsr2.2015.08.007 http://ecite.utas.edu.au/104046 |
geographic |
Antarctic Austral East Antarctica |
geographic_facet |
Antarctic Austral East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice |
op_relation |
http://dx.doi.org/10.1016/j.dsr2.2015.08.007 Roukaerts, A and Cavagna, A-J and Fripiat, F and Lannuzel, D and Meiners, KM and Dehairs, F, Sea-ice algal primary production and nitrogen uptake rates off East Antarctica, Deep-Sea Research. Part II, 131 pp. 140-149. ISSN 0967-0645 (2015) [Refereed Article] http://ecite.utas.edu.au/104046 |
op_doi |
https://doi.org/10.1016/j.dsr2.2015.08.007 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
131 |
container_start_page |
140 |
op_container_end_page |
149 |
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1766274073075122176 |