Export fluxes in a naturally iron-fertilized area of the Southern Ocean - Part 1: Seasonal dynamics of particulate organic carbon export from a moored sediment trap
A sediment trap moored in the naturally iron-fertilized Kerguelen Plateau in the Southern Ocean provided an annual record of particulate organic carbon and nitrogen fluxes at 289 m. At the trap deployment depth, current speeds were typically low (~ 10 cm s−1) and primarily tidal-driven (M2 tidal com...
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COPERNICUS GESELLSCHAFT MBH
2015
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ftawi:oai:epic.awi.de:40441 2023-05-15T18:25:07+02:00 Export fluxes in a naturally iron-fertilized area of the Southern Ocean - Part 1: Seasonal dynamics of particulate organic carbon export from a moored sediment trap Rembauville, Mathieu Salter, Ian Leblond, N. Gueneugues, A Blain, S. 2015-06-02 application/pdf https://epic.awi.de/id/eprint/40441/ https://epic.awi.de/id/eprint/40441/1/Rembauville_et_al_2015a_Biogeoscience.pdf https://hdl.handle.net/10013/epic.47495 https://hdl.handle.net/10013/epic.47495.d001 unknown COPERNICUS GESELLSCHAFT MBH https://epic.awi.de/id/eprint/40441/1/Rembauville_et_al_2015a_Biogeoscience.pdf https://hdl.handle.net/10013/epic.47495.d001 Rembauville, M. , Salter, I. orcid:0000-0002-4513-0314 , Leblond, N. , Gueneugues, A. and Blain, S. (2015) Export fluxes in a naturally iron-fertilized area of the Southern Ocean - Part 1: Seasonal dynamics of particulate organic carbon export from a moored sediment trap , Biogeosciences, 12 , pp. 3153-3170 . doi:10.519/bg-12-3153-2015 <https://doi.org/10.519/bg-12-3153-2015> , hdl:10013/epic.47495 EPIC3Biogeosciences, COPERNICUS GESELLSCHAFT MBH, 12, pp. 3153-3170, ISSN: 1726-4170 Article isiRev 2015 ftawi 2021-12-24T15:41:24Z A sediment trap moored in the naturally iron-fertilized Kerguelen Plateau in the Southern Ocean provided an annual record of particulate organic carbon and nitrogen fluxes at 289 m. At the trap deployment depth, current speeds were typically low (~ 10 cm s−1) and primarily tidal-driven (M2 tidal component). Although advection was weak, the sediment trap may have been subject to hydrodynamical and biological (swimmer feeding on trap funnel) biases. Particulate organic carbon (POC) flux was generally low (< 0.5 mmol m−2 d−1), although two episodic export events (< 14 days) of 1.5 mmol m−2 d−1 were recorded. These increases in flux occurred with a 1-month time lag from peaks in surface chlorophyll and together accounted for approximately 40% of the annual flux budget. The annual POC flux of 98.2 ± 4.4 mmol m−2 yr−1 was low considering the shallow deployment depth but comparable to independent estimates made at similar depths (~ 300 m) over the plateau, and to deep-ocean (> 2 km) fluxes measured from similarly productive iron-fertilized blooms. Although undertrapping cannot be excluded in shallow moored sediment trap deployment, we hypothesize that grazing pressure, including mesozooplankton and mesopelagic fishes, may be responsible for the low POC flux beneath the base of the winter mixed layer. The importance of plankton community structure in controlling the temporal variability of export fluxes is addressed in a companion paper. Article in Journal/Newspaper Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Kerguelen Southern Ocean |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
A sediment trap moored in the naturally iron-fertilized Kerguelen Plateau in the Southern Ocean provided an annual record of particulate organic carbon and nitrogen fluxes at 289 m. At the trap deployment depth, current speeds were typically low (~ 10 cm s−1) and primarily tidal-driven (M2 tidal component). Although advection was weak, the sediment trap may have been subject to hydrodynamical and biological (swimmer feeding on trap funnel) biases. Particulate organic carbon (POC) flux was generally low (< 0.5 mmol m−2 d−1), although two episodic export events (< 14 days) of 1.5 mmol m−2 d−1 were recorded. These increases in flux occurred with a 1-month time lag from peaks in surface chlorophyll and together accounted for approximately 40% of the annual flux budget. The annual POC flux of 98.2 ± 4.4 mmol m−2 yr−1 was low considering the shallow deployment depth but comparable to independent estimates made at similar depths (~ 300 m) over the plateau, and to deep-ocean (> 2 km) fluxes measured from similarly productive iron-fertilized blooms. Although undertrapping cannot be excluded in shallow moored sediment trap deployment, we hypothesize that grazing pressure, including mesozooplankton and mesopelagic fishes, may be responsible for the low POC flux beneath the base of the winter mixed layer. The importance of plankton community structure in controlling the temporal variability of export fluxes is addressed in a companion paper. |
format |
Article in Journal/Newspaper |
author |
Rembauville, Mathieu Salter, Ian Leblond, N. Gueneugues, A Blain, S. |
spellingShingle |
Rembauville, Mathieu Salter, Ian Leblond, N. Gueneugues, A Blain, S. Export fluxes in a naturally iron-fertilized area of the Southern Ocean - Part 1: Seasonal dynamics of particulate organic carbon export from a moored sediment trap |
author_facet |
Rembauville, Mathieu Salter, Ian Leblond, N. Gueneugues, A Blain, S. |
author_sort |
Rembauville, Mathieu |
title |
Export fluxes in a naturally iron-fertilized area of the Southern Ocean - Part 1: Seasonal dynamics of particulate organic carbon export from a moored sediment trap |
title_short |
Export fluxes in a naturally iron-fertilized area of the Southern Ocean - Part 1: Seasonal dynamics of particulate organic carbon export from a moored sediment trap |
title_full |
Export fluxes in a naturally iron-fertilized area of the Southern Ocean - Part 1: Seasonal dynamics of particulate organic carbon export from a moored sediment trap |
title_fullStr |
Export fluxes in a naturally iron-fertilized area of the Southern Ocean - Part 1: Seasonal dynamics of particulate organic carbon export from a moored sediment trap |
title_full_unstemmed |
Export fluxes in a naturally iron-fertilized area of the Southern Ocean - Part 1: Seasonal dynamics of particulate organic carbon export from a moored sediment trap |
title_sort |
export fluxes in a naturally iron-fertilized area of the southern ocean - part 1: seasonal dynamics of particulate organic carbon export from a moored sediment trap |
publisher |
COPERNICUS GESELLSCHAFT MBH |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/40441/ https://epic.awi.de/id/eprint/40441/1/Rembauville_et_al_2015a_Biogeoscience.pdf https://hdl.handle.net/10013/epic.47495 https://hdl.handle.net/10013/epic.47495.d001 |
geographic |
Kerguelen Southern Ocean |
geographic_facet |
Kerguelen Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC3Biogeosciences, COPERNICUS GESELLSCHAFT MBH, 12, pp. 3153-3170, ISSN: 1726-4170 |
op_relation |
https://epic.awi.de/id/eprint/40441/1/Rembauville_et_al_2015a_Biogeoscience.pdf https://hdl.handle.net/10013/epic.47495.d001 Rembauville, M. , Salter, I. orcid:0000-0002-4513-0314 , Leblond, N. , Gueneugues, A. and Blain, S. (2015) Export fluxes in a naturally iron-fertilized area of the Southern Ocean - Part 1: Seasonal dynamics of particulate organic carbon export from a moored sediment trap , Biogeosciences, 12 , pp. 3153-3170 . doi:10.519/bg-12-3153-2015 <https://doi.org/10.519/bg-12-3153-2015> , hdl:10013/epic.47495 |
_version_ |
1766206337467809792 |