Modeling plankton ecosystem functioning and nitrogen fluxes in the oligotrophic waters of the Beaufort Sea, Arctic Ocean: a focus on light-driven processes
The Arctic Ocean (AO) undergoes profound changes of its physical and biotic environments due to climate change. In some areas of the Beaufort Sea, the stronger haline stratification observed in summer alters the plankton ecosystem structure, functioning and productivity, promoting oligotrophy. A one...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2013
|
Subjects: | |
Online Access: | https://doi.org/10.5194/bg-10-4785-2013 https://doaj.org/article/367581ecf9cf414bb584ad8c99f8a6fe |
id |
ftdoajarticles:oai:doaj.org/article:367581ecf9cf414bb584ad8c99f8a6fe |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:367581ecf9cf414bb584ad8c99f8a6fe 2023-05-15T14:54:50+02:00 Modeling plankton ecosystem functioning and nitrogen fluxes in the oligotrophic waters of the Beaufort Sea, Arctic Ocean: a focus on light-driven processes V. Le Fouest B. Zakardjian H. Xie P. Raimbault F. Joux M. Babin 2013-07-01T00:00:00Z https://doi.org/10.5194/bg-10-4785-2013 https://doaj.org/article/367581ecf9cf414bb584ad8c99f8a6fe EN eng Copernicus Publications http://www.biogeosciences.net/10/4785/2013/bg-10-4785-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-4785-2013 1726-4170 1726-4189 https://doaj.org/article/367581ecf9cf414bb584ad8c99f8a6fe Biogeosciences, Vol 10, Iss 7, Pp 4785-4800 (2013) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/bg-10-4785-2013 2022-12-31T07:33:22Z The Arctic Ocean (AO) undergoes profound changes of its physical and biotic environments due to climate change. In some areas of the Beaufort Sea, the stronger haline stratification observed in summer alters the plankton ecosystem structure, functioning and productivity, promoting oligotrophy. A one-dimension (1-D) physical–biological coupled model based on the large multiparametric database of the Malina project in the Beaufort Sea was used (i) to infer the plankton ecosystem functioning and related nitrogen fluxes and (ii) to assess the model sensitivity to key light-driven processes involved in nutrient recycling and phytoplankton growth. The coupled model suggested that ammonium photochemically produced from photosensitive dissolved organic nitrogen (i.e., photoammonification process) was a necessary nitrogen source to achieve the observed levels of microbial biomass and production. Photoammonification directly and indirectly (by stimulating the microbial food web activity) contributed to 70% and 18.5% of the 0–10 m and whole water column, respectively, simulated primary production (respectively 66% and 16% for the bacterial production). The model also suggested that variable carbon to chlorophyll ratios were required to simulate the observed herbivorous versus microbial food web competition and realistic nitrogen fluxes in the Beaufort Sea oligotrophic waters. In face of accelerating Arctic warming, more attention should be paid in the future to the mechanistic processes involved in food webs and functional group competition, nutrient recycling and primary production in poorly productive waters of the AO, as they are expected to expand rapidly. Article in Journal/Newspaper Arctic Arctic Ocean Beaufort Sea Climate change Phytoplankton Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Biogeosciences 10 7 4785 4800 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 V. Le Fouest B. Zakardjian H. Xie P. Raimbault F. Joux M. Babin Modeling plankton ecosystem functioning and nitrogen fluxes in the oligotrophic waters of the Beaufort Sea, Arctic Ocean: a focus on light-driven processes |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The Arctic Ocean (AO) undergoes profound changes of its physical and biotic environments due to climate change. In some areas of the Beaufort Sea, the stronger haline stratification observed in summer alters the plankton ecosystem structure, functioning and productivity, promoting oligotrophy. A one-dimension (1-D) physical–biological coupled model based on the large multiparametric database of the Malina project in the Beaufort Sea was used (i) to infer the plankton ecosystem functioning and related nitrogen fluxes and (ii) to assess the model sensitivity to key light-driven processes involved in nutrient recycling and phytoplankton growth. The coupled model suggested that ammonium photochemically produced from photosensitive dissolved organic nitrogen (i.e., photoammonification process) was a necessary nitrogen source to achieve the observed levels of microbial biomass and production. Photoammonification directly and indirectly (by stimulating the microbial food web activity) contributed to 70% and 18.5% of the 0–10 m and whole water column, respectively, simulated primary production (respectively 66% and 16% for the bacterial production). The model also suggested that variable carbon to chlorophyll ratios were required to simulate the observed herbivorous versus microbial food web competition and realistic nitrogen fluxes in the Beaufort Sea oligotrophic waters. In face of accelerating Arctic warming, more attention should be paid in the future to the mechanistic processes involved in food webs and functional group competition, nutrient recycling and primary production in poorly productive waters of the AO, as they are expected to expand rapidly. |
format |
Article in Journal/Newspaper |
author |
V. Le Fouest B. Zakardjian H. Xie P. Raimbault F. Joux M. Babin |
author_facet |
V. Le Fouest B. Zakardjian H. Xie P. Raimbault F. Joux M. Babin |
author_sort |
V. Le Fouest |
title |
Modeling plankton ecosystem functioning and nitrogen fluxes in the oligotrophic waters of the Beaufort Sea, Arctic Ocean: a focus on light-driven processes |
title_short |
Modeling plankton ecosystem functioning and nitrogen fluxes in the oligotrophic waters of the Beaufort Sea, Arctic Ocean: a focus on light-driven processes |
title_full |
Modeling plankton ecosystem functioning and nitrogen fluxes in the oligotrophic waters of the Beaufort Sea, Arctic Ocean: a focus on light-driven processes |
title_fullStr |
Modeling plankton ecosystem functioning and nitrogen fluxes in the oligotrophic waters of the Beaufort Sea, Arctic Ocean: a focus on light-driven processes |
title_full_unstemmed |
Modeling plankton ecosystem functioning and nitrogen fluxes in the oligotrophic waters of the Beaufort Sea, Arctic Ocean: a focus on light-driven processes |
title_sort |
modeling plankton ecosystem functioning and nitrogen fluxes in the oligotrophic waters of the beaufort sea, arctic ocean: a focus on light-driven processes |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-4785-2013 https://doaj.org/article/367581ecf9cf414bb584ad8c99f8a6fe |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Beaufort Sea Climate change Phytoplankton |
genre_facet |
Arctic Arctic Ocean Beaufort Sea Climate change Phytoplankton |
op_source |
Biogeosciences, Vol 10, Iss 7, Pp 4785-4800 (2013) |
op_relation |
http://www.biogeosciences.net/10/4785/2013/bg-10-4785-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-4785-2013 1726-4170 1726-4189 https://doaj.org/article/367581ecf9cf414bb584ad8c99f8a6fe |
op_doi |
https://doi.org/10.5194/bg-10-4785-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
7 |
container_start_page |
4785 |
op_container_end_page |
4800 |
_version_ |
1766326578867863552 |