Modelling the impact of riverine DON removal by marine bacterioplankton on primary production in the Arctic Ocean
The planktonic and biogeochemical dynamics of the Arctic shelves exhibit a strong variability in response to Arctic warming. In this study, we employ a biogeochemical model coupled to a pan-Arctic ocean–sea ice model (MITgcm) to elucidate the processes regulating the primary production (PP) of phyto...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2015
|
Subjects: | |
Online Access: | https://doi.org/10.5194/bg-12-3385-2015 https://doaj.org/article/bb3af1459aa94119bff4f01456cc5b53 |
id |
ftdoajarticles:oai:doaj.org/article:bb3af1459aa94119bff4f01456cc5b53 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:bb3af1459aa94119bff4f01456cc5b53 2023-05-15T14:40:05+02:00 Modelling the impact of riverine DON removal by marine bacterioplankton on primary production in the Arctic Ocean V. Le Fouest M. Manizza B. Tremblay M. Babin 2015-06-01T00:00:00Z https://doi.org/10.5194/bg-12-3385-2015 https://doaj.org/article/bb3af1459aa94119bff4f01456cc5b53 EN eng Copernicus Publications https://www.biogeosciences.net/12/3385/2015/bg-12-3385-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-12-3385-2015 1726-4170 1726-4189 https://doaj.org/article/bb3af1459aa94119bff4f01456cc5b53 Biogeosciences, Vol 12, Pp 3385-3402 (2015) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/bg-12-3385-2015 2022-12-31T14:46:00Z The planktonic and biogeochemical dynamics of the Arctic shelves exhibit a strong variability in response to Arctic warming. In this study, we employ a biogeochemical model coupled to a pan-Arctic ocean–sea ice model (MITgcm) to elucidate the processes regulating the primary production (PP) of phytoplankton, bacterioplankton (BP), and their interactions. The model explicitly simulates and quantifies the contribution of usable dissolved organic nitrogen (DON) drained by the major circum-Arctic rivers to PP and BP in a scenario of melting sea ice (1998–2011). Model simulations suggest that, on average between 1998 and 2011, the removal of usable riverine dissolved organic nitrogen (RDON) by bacterioplankton is responsible for a ~ 26% increase in the annual BP for the whole Arctic Ocean. With respect to total PP, the model simulates an increase of ~ 8% on an annual basis and of ~ 18% in summer. Recycled ammonium is responsible for the PP increase. The recycling of RDON by bacterioplankton promotes higher BP and PP, but there is no significant temporal trend in the BP : PP ratio within the ice-free shelves over the 1998–2011 period. This suggests no significant evolution in the balance between autotrophy and heterotrophy in the last decade, with a constant annual flux of RDON into the coastal ocean, although changes in RDON supply and further reduction in sea-ice cover could potentially alter this delicate balance. Article in Journal/Newspaper Arctic Arctic Ocean Phytoplankton Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Biogeosciences 12 11 3385 3402 |
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 M. Manizza B. Tremblay M. Babin Modelling the impact of riverine DON removal by marine bacterioplankton on primary production in the Arctic Ocean |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The planktonic and biogeochemical dynamics of the Arctic shelves exhibit a strong variability in response to Arctic warming. In this study, we employ a biogeochemical model coupled to a pan-Arctic ocean–sea ice model (MITgcm) to elucidate the processes regulating the primary production (PP) of phytoplankton, bacterioplankton (BP), and their interactions. The model explicitly simulates and quantifies the contribution of usable dissolved organic nitrogen (DON) drained by the major circum-Arctic rivers to PP and BP in a scenario of melting sea ice (1998–2011). Model simulations suggest that, on average between 1998 and 2011, the removal of usable riverine dissolved organic nitrogen (RDON) by bacterioplankton is responsible for a ~ 26% increase in the annual BP for the whole Arctic Ocean. With respect to total PP, the model simulates an increase of ~ 8% on an annual basis and of ~ 18% in summer. Recycled ammonium is responsible for the PP increase. The recycling of RDON by bacterioplankton promotes higher BP and PP, but there is no significant temporal trend in the BP : PP ratio within the ice-free shelves over the 1998–2011 period. This suggests no significant evolution in the balance between autotrophy and heterotrophy in the last decade, with a constant annual flux of RDON into the coastal ocean, although changes in RDON supply and further reduction in sea-ice cover could potentially alter this delicate balance. |
format |
Article in Journal/Newspaper |
author |
V. Le Fouest M. Manizza B. Tremblay M. Babin |
author_facet |
V. Le Fouest M. Manizza B. Tremblay M. Babin |
author_sort |
V. Le Fouest |
title |
Modelling the impact of riverine DON removal by marine bacterioplankton on primary production in the Arctic Ocean |
title_short |
Modelling the impact of riverine DON removal by marine bacterioplankton on primary production in the Arctic Ocean |
title_full |
Modelling the impact of riverine DON removal by marine bacterioplankton on primary production in the Arctic Ocean |
title_fullStr |
Modelling the impact of riverine DON removal by marine bacterioplankton on primary production in the Arctic Ocean |
title_full_unstemmed |
Modelling the impact of riverine DON removal by marine bacterioplankton on primary production in the Arctic Ocean |
title_sort |
modelling the impact of riverine don removal by marine bacterioplankton on primary production in the arctic ocean |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-3385-2015 https://doaj.org/article/bb3af1459aa94119bff4f01456cc5b53 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Ocean Phytoplankton Sea ice |
op_source |
Biogeosciences, Vol 12, Pp 3385-3402 (2015) |
op_relation |
https://www.biogeosciences.net/12/3385/2015/bg-12-3385-2015.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-12-3385-2015 1726-4170 1726-4189 https://doaj.org/article/bb3af1459aa94119bff4f01456cc5b53 |
op_doi |
https://doi.org/10.5194/bg-12-3385-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
11 |
container_start_page |
3385 |
op_container_end_page |
3402 |
_version_ |
1766312009382494208 |