Role of advection in Arctic Ocean lower trophic dynamics: a modelling perspective
The Arctic Ocean (AO) is an oligotrophic system with a pronounced subsurface Chl-a maximum dominating productivity over the majority of the basin. Strong haline stratification of the AO and substantial ice cover suppress vertical mixing and restrict the vertical supply of nutrients to the photic zon...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://eprints.soton.ac.uk/350463/ https://eprints.soton.ac.uk/350463/1/jgrc20126_Popova.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:350463 2023-07-30T03:59:49+02:00 Role of advection in Arctic Ocean lower trophic dynamics: a modelling perspective Popova, E.E. Yool, A. Aksenov, Y. Coward, A.C. 2013-03 text https://eprints.soton.ac.uk/350463/ https://eprints.soton.ac.uk/350463/1/jgrc20126_Popova.pdf en eng https://eprints.soton.ac.uk/350463/1/jgrc20126_Popova.pdf Popova, E.E., Yool, A., Aksenov, Y. and Coward, A.C. (2013) Role of advection in Arctic Ocean lower trophic dynamics: a modelling perspective. Journal of Geophysical Research, 118 (3), 1571-1586. (doi:10.1002/jgrc.20126 <http://dx.doi.org/10.1002/jgrc.20126>). Article PeerReviewed 2013 ftsouthampton https://doi.org/10.1002/jgrc.20126 2023-07-09T21:45:32Z The Arctic Ocean (AO) is an oligotrophic system with a pronounced subsurface Chl-a maximum dominating productivity over the majority of the basin. Strong haline stratification of the AO and substantial ice cover suppress vertical mixing and restrict the vertical supply of nutrients to the photic zone. In such a vertically stratified oligotrophic system, the horizontal supply of nutrients by advection plays an important role in sustaining primary production. In this paper we attempt to characterise the role of nutrient advection in the maintenance of the subsurface Chl-a maximum, using time scales to determine the connectivity between the photic zone of the deep Arctic Ocean, nutrient-rich Pacific and Atlantic inflow waters, and bottom waters of the wide continental shelves of the AO. Our study uses output from a general circulation model, NEMO, coupled to a model of ocean biogeochemistry, MEDUSA. A Lagrangian particle tracking approach is used to back-track water from where it forms subsurface Chl-a maxima to the points of entry into the AO and to analyse nutrient transformation along the route. Our experiments show that advective timescales linking subsurface layers of the central AO with the nutrient rich Pacific and Atlantic waters do not exceed 15-20?years, and that the advective supply of shelf nutrients to the deep AO occurs on the timescale of about 5?years. We show substantial role of the continental shelf pump in sustaining up to 20% of total AO primary production. Article in Journal/Newspaper Arctic Arctic Arctic Ocean University of Southampton: e-Prints Soton Arctic Arctic Ocean Pacific Medusa ENVELOPE(157.417,157.417,-79.633,-79.633) Journal of Geophysical Research: Oceans 118 3 1571 1586 |
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Open Polar |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
The Arctic Ocean (AO) is an oligotrophic system with a pronounced subsurface Chl-a maximum dominating productivity over the majority of the basin. Strong haline stratification of the AO and substantial ice cover suppress vertical mixing and restrict the vertical supply of nutrients to the photic zone. In such a vertically stratified oligotrophic system, the horizontal supply of nutrients by advection plays an important role in sustaining primary production. In this paper we attempt to characterise the role of nutrient advection in the maintenance of the subsurface Chl-a maximum, using time scales to determine the connectivity between the photic zone of the deep Arctic Ocean, nutrient-rich Pacific and Atlantic inflow waters, and bottom waters of the wide continental shelves of the AO. Our study uses output from a general circulation model, NEMO, coupled to a model of ocean biogeochemistry, MEDUSA. A Lagrangian particle tracking approach is used to back-track water from where it forms subsurface Chl-a maxima to the points of entry into the AO and to analyse nutrient transformation along the route. Our experiments show that advective timescales linking subsurface layers of the central AO with the nutrient rich Pacific and Atlantic waters do not exceed 15-20?years, and that the advective supply of shelf nutrients to the deep AO occurs on the timescale of about 5?years. We show substantial role of the continental shelf pump in sustaining up to 20% of total AO primary production. |
format |
Article in Journal/Newspaper |
author |
Popova, E.E. Yool, A. Aksenov, Y. Coward, A.C. |
spellingShingle |
Popova, E.E. Yool, A. Aksenov, Y. Coward, A.C. Role of advection in Arctic Ocean lower trophic dynamics: a modelling perspective |
author_facet |
Popova, E.E. Yool, A. Aksenov, Y. Coward, A.C. |
author_sort |
Popova, E.E. |
title |
Role of advection in Arctic Ocean lower trophic dynamics: a modelling perspective |
title_short |
Role of advection in Arctic Ocean lower trophic dynamics: a modelling perspective |
title_full |
Role of advection in Arctic Ocean lower trophic dynamics: a modelling perspective |
title_fullStr |
Role of advection in Arctic Ocean lower trophic dynamics: a modelling perspective |
title_full_unstemmed |
Role of advection in Arctic Ocean lower trophic dynamics: a modelling perspective |
title_sort |
role of advection in arctic ocean lower trophic dynamics: a modelling perspective |
publishDate |
2013 |
url |
https://eprints.soton.ac.uk/350463/ https://eprints.soton.ac.uk/350463/1/jgrc20126_Popova.pdf |
long_lat |
ENVELOPE(157.417,157.417,-79.633,-79.633) |
geographic |
Arctic Arctic Ocean Pacific Medusa |
geographic_facet |
Arctic Arctic Ocean Pacific Medusa |
genre |
Arctic Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Arctic Ocean |
op_relation |
https://eprints.soton.ac.uk/350463/1/jgrc20126_Popova.pdf Popova, E.E., Yool, A., Aksenov, Y. and Coward, A.C. (2013) Role of advection in Arctic Ocean lower trophic dynamics: a modelling perspective. Journal of Geophysical Research, 118 (3), 1571-1586. (doi:10.1002/jgrc.20126 <http://dx.doi.org/10.1002/jgrc.20126>). |
op_doi |
https://doi.org/10.1002/jgrc.20126 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
118 |
container_issue |
3 |
container_start_page |
1571 |
op_container_end_page |
1586 |
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1772810583145447424 |