Efficiency of the silicate pump at a coastal oligotrophic site in the Mediterranean Sea
A one-year survey of the sedimenting particulate material was conducted at the SOFi site located on the edge of the continental slope in the Gulf of Lions (Northwestern Mediterranean) between September 1999 and December 2000. The main focus of this paper was to establish an annual budget of biogenic...
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ftccsdartic:oai:HAL:hal-00688018v1 2023-05-15T18:26:01+02:00 Efficiency of the silicate pump at a coastal oligotrophic site in the Mediterranean Sea LEBLANC, Karine QUEGUINER, Bernard Raimbault, Patrick Garcia, Nicole Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN) 2005 https://hal.archives-ouvertes.fr/hal-00688018 https://hal.archives-ouvertes.fr/hal-00688018/document https://hal.archives-ouvertes.fr/hal-00688018/file/bg-2-219-2005.pdf en eng HAL CCSD European Geosciences Union hal-00688018 https://hal.archives-ouvertes.fr/hal-00688018 https://hal.archives-ouvertes.fr/hal-00688018/document https://hal.archives-ouvertes.fr/hal-00688018/file/bg-2-219-2005.pdf http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess CC-BY-ND ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.archives-ouvertes.fr/hal-00688018 Biogeosciences, European Geosciences Union, 2005, 2, pp.219-229 PARTICLE FLUXES NORTHEASTERN ATLANTIC PARTICULATE FLUXES MARINE-SEDIMENTS BIOGENIC SILICA DOWNWARD FLUXES ORGANIC-MATTER SOUTHERN-OCEAN WORLD OCEAN LIONS [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2005 ftccsdartic 2021-10-24T00:33:13Z A one-year survey of the sedimenting particulate material was conducted at the SOFi site located on the edge of the continental slope in the Gulf of Lions (Northwestern Mediterranean) between September 1999 and December 2000. The main focus of this paper was to establish an annual budget of biogenic silica export, to describe the seasonnal pattern of Si fluxes in relation to the organic and mineral C fluxes and to quantify the Si/C decoupling processes during sedimentation. The pattern of the downward flux of BSi was partly typical with increased daily sedimentation rates during spring followed by smaller peaks during summer. However, an unusual sedimentation event was recorded in the bottom trap in February before the spring thermal stratification occurred, and represented 37% of the annual BSi mass flux. The total annual BSi flux at the SOFi site was estimated from the bottom trap and amounted to 86.8 mmol Si m(-2) y(-1), while the organic carbon flux amounted to 154.9 mmol C m(-2) y(-1). The overall efficiency of C export to depth compared to surface primary production budgets was low (3%) and similar to values found for oligotrophic regions of the Eastern Mediterranean. On the other hand, we documented a very high efficiency of the Si export at the SOFi site, with 62% of the Si produced in the surface layer exported to the bottom trap. The excellent correlation between BSi and particulate organic C (POC) in the bottom trap further indicates that the bulk of the organic matter is transferred to depth in association with diatoms. However, the main fraction of the C produced by phytoplankton is lost in the water column through oxidation or metabolisation, while biogenic silica is more efficiently transferred to depth. This strong Si/C decoupling with depth is likely to be the cause of the spring depletion of silicic acid over the entire water column which was observed by mid-April in a companion study (Leblanc et al., 2003) and may cause a severe Si limitation of the diatom spring bloom in this oligotrophic ... Article in Journal/Newspaper Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) LeBlanc ENVELOPE(-98.767,-98.767,-71.733,-71.733) Southern Ocean |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
PARTICLE FLUXES NORTHEASTERN ATLANTIC PARTICULATE FLUXES MARINE-SEDIMENTS BIOGENIC SILICA DOWNWARD FLUXES ORGANIC-MATTER SOUTHERN-OCEAN WORLD OCEAN LIONS [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
PARTICLE FLUXES NORTHEASTERN ATLANTIC PARTICULATE FLUXES MARINE-SEDIMENTS BIOGENIC SILICA DOWNWARD FLUXES ORGANIC-MATTER SOUTHERN-OCEAN WORLD OCEAN LIONS [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere LEBLANC, Karine QUEGUINER, Bernard Raimbault, Patrick Garcia, Nicole Efficiency of the silicate pump at a coastal oligotrophic site in the Mediterranean Sea |
topic_facet |
PARTICLE FLUXES NORTHEASTERN ATLANTIC PARTICULATE FLUXES MARINE-SEDIMENTS BIOGENIC SILICA DOWNWARD FLUXES ORGANIC-MATTER SOUTHERN-OCEAN WORLD OCEAN LIONS [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
A one-year survey of the sedimenting particulate material was conducted at the SOFi site located on the edge of the continental slope in the Gulf of Lions (Northwestern Mediterranean) between September 1999 and December 2000. The main focus of this paper was to establish an annual budget of biogenic silica export, to describe the seasonnal pattern of Si fluxes in relation to the organic and mineral C fluxes and to quantify the Si/C decoupling processes during sedimentation. The pattern of the downward flux of BSi was partly typical with increased daily sedimentation rates during spring followed by smaller peaks during summer. However, an unusual sedimentation event was recorded in the bottom trap in February before the spring thermal stratification occurred, and represented 37% of the annual BSi mass flux. The total annual BSi flux at the SOFi site was estimated from the bottom trap and amounted to 86.8 mmol Si m(-2) y(-1), while the organic carbon flux amounted to 154.9 mmol C m(-2) y(-1). The overall efficiency of C export to depth compared to surface primary production budgets was low (3%) and similar to values found for oligotrophic regions of the Eastern Mediterranean. On the other hand, we documented a very high efficiency of the Si export at the SOFi site, with 62% of the Si produced in the surface layer exported to the bottom trap. The excellent correlation between BSi and particulate organic C (POC) in the bottom trap further indicates that the bulk of the organic matter is transferred to depth in association with diatoms. However, the main fraction of the C produced by phytoplankton is lost in the water column through oxidation or metabolisation, while biogenic silica is more efficiently transferred to depth. This strong Si/C decoupling with depth is likely to be the cause of the spring depletion of silicic acid over the entire water column which was observed by mid-April in a companion study (Leblanc et al., 2003) and may cause a severe Si limitation of the diatom spring bloom in this oligotrophic ... |
author2 |
Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN) |
format |
Article in Journal/Newspaper |
author |
LEBLANC, Karine QUEGUINER, Bernard Raimbault, Patrick Garcia, Nicole |
author_facet |
LEBLANC, Karine QUEGUINER, Bernard Raimbault, Patrick Garcia, Nicole |
author_sort |
LEBLANC, Karine |
title |
Efficiency of the silicate pump at a coastal oligotrophic site in the Mediterranean Sea |
title_short |
Efficiency of the silicate pump at a coastal oligotrophic site in the Mediterranean Sea |
title_full |
Efficiency of the silicate pump at a coastal oligotrophic site in the Mediterranean Sea |
title_fullStr |
Efficiency of the silicate pump at a coastal oligotrophic site in the Mediterranean Sea |
title_full_unstemmed |
Efficiency of the silicate pump at a coastal oligotrophic site in the Mediterranean Sea |
title_sort |
efficiency of the silicate pump at a coastal oligotrophic site in the mediterranean sea |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.archives-ouvertes.fr/hal-00688018 https://hal.archives-ouvertes.fr/hal-00688018/document https://hal.archives-ouvertes.fr/hal-00688018/file/bg-2-219-2005.pdf |
long_lat |
ENVELOPE(-98.767,-98.767,-71.733,-71.733) |
geographic |
LeBlanc Southern Ocean |
geographic_facet |
LeBlanc Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.archives-ouvertes.fr/hal-00688018 Biogeosciences, European Geosciences Union, 2005, 2, pp.219-229 |
op_relation |
hal-00688018 https://hal.archives-ouvertes.fr/hal-00688018 https://hal.archives-ouvertes.fr/hal-00688018/document https://hal.archives-ouvertes.fr/hal-00688018/file/bg-2-219-2005.pdf |
op_rights |
http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess |
op_rightsnorm |
CC-BY-ND |
_version_ |
1766207802496253952 |