Modelling the silica pump in the Permanently Open Ocean Zone of the Southern Ocean
A coupled 1D physical–biogeochemical model has been built to simulate the cycles of silicon and of nitrogen in the Indian sector of the Permanently Open Ocean Zone of the Southern Ocean. Based on a simplified trophic network, that includes two size classes of phytoplankton and of zooplankton, and a...
Main Authors: | , , , , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1996
|
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.549.3464 http://www.com.univ-mrs.fr/~queguiner/files/Pondaven et al_1998.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.549.3464 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.549.3464 2023-05-15T17:35:10+02:00 Modelling the silica pump in the Permanently Open Ocean Zone of the Southern Ocean P. Pondaven A C. Fravalo A D. Ruiz-pino B P. Treguer A B. Queguiner A C. Jeandel C The Pennsylvania State University CiteSeerX Archives 1996 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.549.3464 http://www.com.univ-mrs.fr/~queguiner/files/Pondaven et al_1998.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.549.3464 http://www.com.univ-mrs.fr/~queguiner/files/Pondaven et al_1998.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.com.univ-mrs.fr/~queguiner/files/Pondaven et al_1998.pdf text 1996 ftciteseerx 2016-01-08T11:26:18Z A coupled 1D physical–biogeochemical model has been built to simulate the cycles of silicon and of nitrogen in the Indian sector of the Permanently Open Ocean Zone of the Southern Ocean. Based on a simplified trophic network, that includes two size classes of phytoplankton and of zooplankton, and a microbial loop, it has been calibrated by reference to X X.surface physical, chemical and biological data sets collected at the KERFIX time-series station 50840 S–68825 E. The model correctly reproduces the high nutrient low chlorophyll features typical of the studied area. In a region where the spring–summer mixed layer depth is usually deeper than 60 m, the maximum of chlorophyll never exceeds 1.5 mg my3, and y2 y1 the annual primary production is only 68 g C m year. In the surface layer nitrate is never exhausted range 27–23.5 y3. y3.mmoles m while silicic acid shows strong seasonal variations range 5–20 mmoles m. On an annual basis 71 % of the primary production sustained by nanophytoplankton is grazed by microzooplankton. Compared to North Atlantic, siliceous microphytoplankton is mainly prevented from blooming because of an unfavourable spring–summer light-mixing regime. y3.Silicic acid limitation high half saturation constant for Si uptake: 8 mmoles m also plays a major role on diatom growth. Mesozooplankton grazing pressure excerpts its influence especially in late spring. The model illustrates the efficiency of the silica pump in the Southern Ocean: up to 63 % of the biogenic silica that has been synthetized in the photic layer is exported towards the deep ocean, while only 11 % of the particulate organic nitrogen escapes recycling in the surface layer. Text North Atlantic Southern Ocean Unknown Indian Southern Ocean |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
A coupled 1D physical–biogeochemical model has been built to simulate the cycles of silicon and of nitrogen in the Indian sector of the Permanently Open Ocean Zone of the Southern Ocean. Based on a simplified trophic network, that includes two size classes of phytoplankton and of zooplankton, and a microbial loop, it has been calibrated by reference to X X.surface physical, chemical and biological data sets collected at the KERFIX time-series station 50840 S–68825 E. The model correctly reproduces the high nutrient low chlorophyll features typical of the studied area. In a region where the spring–summer mixed layer depth is usually deeper than 60 m, the maximum of chlorophyll never exceeds 1.5 mg my3, and y2 y1 the annual primary production is only 68 g C m year. In the surface layer nitrate is never exhausted range 27–23.5 y3. y3.mmoles m while silicic acid shows strong seasonal variations range 5–20 mmoles m. On an annual basis 71 % of the primary production sustained by nanophytoplankton is grazed by microzooplankton. Compared to North Atlantic, siliceous microphytoplankton is mainly prevented from blooming because of an unfavourable spring–summer light-mixing regime. y3.Silicic acid limitation high half saturation constant for Si uptake: 8 mmoles m also plays a major role on diatom growth. Mesozooplankton grazing pressure excerpts its influence especially in late spring. The model illustrates the efficiency of the silica pump in the Southern Ocean: up to 63 % of the biogenic silica that has been synthetized in the photic layer is exported towards the deep ocean, while only 11 % of the particulate organic nitrogen escapes recycling in the surface layer. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
P. Pondaven A C. Fravalo A D. Ruiz-pino B P. Treguer A B. Queguiner A C. Jeandel C |
spellingShingle |
P. Pondaven A C. Fravalo A D. Ruiz-pino B P. Treguer A B. Queguiner A C. Jeandel C Modelling the silica pump in the Permanently Open Ocean Zone of the Southern Ocean |
author_facet |
P. Pondaven A C. Fravalo A D. Ruiz-pino B P. Treguer A B. Queguiner A C. Jeandel C |
author_sort |
P. Pondaven A |
title |
Modelling the silica pump in the Permanently Open Ocean Zone of the Southern Ocean |
title_short |
Modelling the silica pump in the Permanently Open Ocean Zone of the Southern Ocean |
title_full |
Modelling the silica pump in the Permanently Open Ocean Zone of the Southern Ocean |
title_fullStr |
Modelling the silica pump in the Permanently Open Ocean Zone of the Southern Ocean |
title_full_unstemmed |
Modelling the silica pump in the Permanently Open Ocean Zone of the Southern Ocean |
title_sort |
modelling the silica pump in the permanently open ocean zone of the southern ocean |
publishDate |
1996 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.549.3464 http://www.com.univ-mrs.fr/~queguiner/files/Pondaven et al_1998.pdf |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
http://www.com.univ-mrs.fr/~queguiner/files/Pondaven et al_1998.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.549.3464 http://www.com.univ-mrs.fr/~queguiner/files/Pondaven et al_1998.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766134246672433152 |