Sinking rates of particles in biogenic silica- and carbonate-dominated production systems of the Atlantic Ocean: implications for the organic carbon fluxes to the deep ocean
International audience The flux of materials to the deep sea is dominated by larger, organic-rich particles with sinking rates varying between a few meters and several hundred meters per day. Mineral ballast may regulate the transfer of organic matter and other components by determining the sinking...
Main Authors: | , |
---|---|
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2008
|
Subjects: | |
Online Access: | https://hal.science/hal-00298017 https://hal.science/hal-00298017/document https://hal.science/hal-00298017/file/bgd-5-2541-2008.pdf |
id |
ftccsdartic:oai:HAL:hal-00298017v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-00298017v1 2024-02-11T10:08:54+01:00 Sinking rates of particles in biogenic silica- and carbonate-dominated production systems of the Atlantic Ocean: implications for the organic carbon fluxes to the deep ocean Fischer, G. Karakas, G. Faculty of Geosciences and MARUM University of Bremen Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association 2008-06-16 https://hal.science/hal-00298017 https://hal.science/hal-00298017/document https://hal.science/hal-00298017/file/bgd-5-2541-2008.pdf en eng HAL CCSD European Geosciences Union hal-00298017 https://hal.science/hal-00298017 https://hal.science/hal-00298017/document https://hal.science/hal-00298017/file/bgd-5-2541-2008.pdf info:eu-repo/semantics/OpenAccess ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.science/hal-00298017 Biogeosciences Discussions, 2008, 5 (3), pp.2541-2581 [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2008 ftccsdartic 2024-01-21T01:00:03Z International audience The flux of materials to the deep sea is dominated by larger, organic-rich particles with sinking rates varying between a few meters and several hundred meters per day. Mineral ballast may regulate the transfer of organic matter and other components by determining the sinking rates, e.g. via particle density. We calculated particle sinking rates from flux patterns and alkenone measurements applying sediment trap experiments from the Atlantic Ocean. We obtained higher particle sinking rates in carbonate-dominated production systems, both regionally and seasonally. During a summer coccolithophorid bloom in the Cape Blanc coastal upwelling off Mauritania, sinking rates reached almost 570 m per day, most probably due the fast sedimentation via zooplankton fecal pellets. During the recurring winter-spring blooms off NW Africa and in opal-rich production systems of the Southern Ocean, sinking rates of larger particles, most probably diatom aggregates, appeared to be lower. Although a tight and overall coupling between dust supply and particle sinking rates was not observed, it remains noticeable that the highest sinking rates occurred mostly in the dust-rich ocean regions off NW Africa. We obtained increasing sinking rates with depth. By using a seven-compartment biogeochemical model, it was shown that deep ocean organic carbon fluxes at a mesotrophic sediment trap site off Cape Blanc can be captured fairly well using seasonal variable particle sinking rates. Our model provides a total organic carbon flux of 0.29 Tg per year down to 3000 m off the NW African upwelling region between 5 and 35° N. Article in Journal/Newspaper Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) 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 |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Fischer, G. Karakas, G. Sinking rates of particles in biogenic silica- and carbonate-dominated production systems of the Atlantic Ocean: implications for the organic carbon fluxes to the deep ocean |
topic_facet |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The flux of materials to the deep sea is dominated by larger, organic-rich particles with sinking rates varying between a few meters and several hundred meters per day. Mineral ballast may regulate the transfer of organic matter and other components by determining the sinking rates, e.g. via particle density. We calculated particle sinking rates from flux patterns and alkenone measurements applying sediment trap experiments from the Atlantic Ocean. We obtained higher particle sinking rates in carbonate-dominated production systems, both regionally and seasonally. During a summer coccolithophorid bloom in the Cape Blanc coastal upwelling off Mauritania, sinking rates reached almost 570 m per day, most probably due the fast sedimentation via zooplankton fecal pellets. During the recurring winter-spring blooms off NW Africa and in opal-rich production systems of the Southern Ocean, sinking rates of larger particles, most probably diatom aggregates, appeared to be lower. Although a tight and overall coupling between dust supply and particle sinking rates was not observed, it remains noticeable that the highest sinking rates occurred mostly in the dust-rich ocean regions off NW Africa. We obtained increasing sinking rates with depth. By using a seven-compartment biogeochemical model, it was shown that deep ocean organic carbon fluxes at a mesotrophic sediment trap site off Cape Blanc can be captured fairly well using seasonal variable particle sinking rates. Our model provides a total organic carbon flux of 0.29 Tg per year down to 3000 m off the NW African upwelling region between 5 and 35° N. |
author2 |
Faculty of Geosciences and MARUM University of Bremen Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association |
format |
Article in Journal/Newspaper |
author |
Fischer, G. Karakas, G. |
author_facet |
Fischer, G. Karakas, G. |
author_sort |
Fischer, G. |
title |
Sinking rates of particles in biogenic silica- and carbonate-dominated production systems of the Atlantic Ocean: implications for the organic carbon fluxes to the deep ocean |
title_short |
Sinking rates of particles in biogenic silica- and carbonate-dominated production systems of the Atlantic Ocean: implications for the organic carbon fluxes to the deep ocean |
title_full |
Sinking rates of particles in biogenic silica- and carbonate-dominated production systems of the Atlantic Ocean: implications for the organic carbon fluxes to the deep ocean |
title_fullStr |
Sinking rates of particles in biogenic silica- and carbonate-dominated production systems of the Atlantic Ocean: implications for the organic carbon fluxes to the deep ocean |
title_full_unstemmed |
Sinking rates of particles in biogenic silica- and carbonate-dominated production systems of the Atlantic Ocean: implications for the organic carbon fluxes to the deep ocean |
title_sort |
sinking rates of particles in biogenic silica- and carbonate-dominated production systems of the atlantic ocean: implications for the organic carbon fluxes to the deep ocean |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00298017 https://hal.science/hal-00298017/document https://hal.science/hal-00298017/file/bgd-5-2541-2008.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.science/hal-00298017 Biogeosciences Discussions, 2008, 5 (3), pp.2541-2581 |
op_relation |
hal-00298017 https://hal.science/hal-00298017 https://hal.science/hal-00298017/document https://hal.science/hal-00298017/file/bgd-5-2541-2008.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1790608529210474496 |