Do Oceanic Hypoxic Regions Act as Barriers for Sinking Particles? A Case Study in the Eastern Tropical North Atlantic
International audience In oxygen minimum zones (OMZs), the attenuation rates of particulate organic carbon (POC) fluxes of large particles are known to be reduced, thus increasing the efficiency with which the biological carbon pump (BCP) transfers carbon to the abyss. The BCP efficiency is expected...
Published in: | Global Biogeochemical Cycles |
---|---|
Main Authors: | , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2019
|
Subjects: | |
Online Access: | https://hal.sorbonne-universite.fr/hal-02421663 https://hal.sorbonne-universite.fr/hal-02421663/document https://hal.sorbonne-universite.fr/hal-02421663/file/Rasse_et_al-2019-Global_Biogeochemical_Cycles.pdf https://doi.org/10.1029/2019GB006305 |
id |
ftinsu:oai:HAL:hal-02421663v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:hal-02421663v1 2023-11-05T03:43:52+01:00 Do Oceanic Hypoxic Regions Act as Barriers for Sinking Particles? A Case Study in the Eastern Tropical North Atlantic Rasse, Rafael Dall'Olmo, Giorgio Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Plymouth University 2019-12-05 https://hal.sorbonne-universite.fr/hal-02421663 https://hal.sorbonne-universite.fr/hal-02421663/document https://hal.sorbonne-universite.fr/hal-02421663/file/Rasse_et_al-2019-Global_Biogeochemical_Cycles.pdf https://doi.org/10.1029/2019GB006305 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2019GB006305 hal-02421663 https://hal.sorbonne-universite.fr/hal-02421663 https://hal.sorbonne-universite.fr/hal-02421663/document https://hal.sorbonne-universite.fr/hal-02421663/file/Rasse_et_al-2019-Global_Biogeochemical_Cycles.pdf doi:10.1029/2019GB006305 info:eu-repo/semantics/OpenAccess ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://hal.sorbonne-universite.fr/hal-02421663 Global Biogeochemical Cycles, 2019, ⟨10.1029/2019GB006305⟩ [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2019 ftinsu https://doi.org/10.1029/2019GB006305 2023-10-11T16:36:35Z International audience In oxygen minimum zones (OMZs), the attenuation rates of particulate organic carbon (POC) fluxes of large particles are known to be reduced, thus increasing the efficiency with which the biological carbon pump (BCP) transfers carbon to the abyss. The BCP efficiency is expected to further increase if OMZs expand. However, little is known about how the POC fluxes of small particles-a significant component of the BCP-are attenuated inside OMZs. In this study, data collected by two BGC-Argo floats deployed in the hypoxic OMZ of the eastern tropical North Atlantic were used to estimate net instantaneous fluxes of POC via small particle during 3 years. This information was analyzed together with meteorological data and published POC fluxes of large particles and allowed us to conclude that (1) major pulses of surface-derived small particles toward the OMZ interior coincided with seasonal changes in wind stress and precipitation; (2) a permanent layer of small particles, presumably linked to microbial communities, was found in the upper section of the OMZ which might play a key role attenuating POC fluxes; and (3) fluxes of large particles were attenuated less efficiently inside this poorly oxygenated region than above it, while attenuation of small-particle fluxes were equivalent or significantly higher inside the OMZ. These results highlight that more information about the processes controlling the fluxes of small and large particles in hypoxic OMZs is needed to better understand the impact of hypoxic OMZs on the BCP efficiency. Article in Journal/Newspaper North Atlantic Institut national des sciences de l'Univers: HAL-INSU Global Biogeochemical Cycles 33 12 1611 1630 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Rasse, Rafael Dall'Olmo, Giorgio Do Oceanic Hypoxic Regions Act as Barriers for Sinking Particles? A Case Study in the Eastern Tropical North Atlantic |
topic_facet |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience In oxygen minimum zones (OMZs), the attenuation rates of particulate organic carbon (POC) fluxes of large particles are known to be reduced, thus increasing the efficiency with which the biological carbon pump (BCP) transfers carbon to the abyss. The BCP efficiency is expected to further increase if OMZs expand. However, little is known about how the POC fluxes of small particles-a significant component of the BCP-are attenuated inside OMZs. In this study, data collected by two BGC-Argo floats deployed in the hypoxic OMZ of the eastern tropical North Atlantic were used to estimate net instantaneous fluxes of POC via small particle during 3 years. This information was analyzed together with meteorological data and published POC fluxes of large particles and allowed us to conclude that (1) major pulses of surface-derived small particles toward the OMZ interior coincided with seasonal changes in wind stress and precipitation; (2) a permanent layer of small particles, presumably linked to microbial communities, was found in the upper section of the OMZ which might play a key role attenuating POC fluxes; and (3) fluxes of large particles were attenuated less efficiently inside this poorly oxygenated region than above it, while attenuation of small-particle fluxes were equivalent or significantly higher inside the OMZ. These results highlight that more information about the processes controlling the fluxes of small and large particles in hypoxic OMZs is needed to better understand the impact of hypoxic OMZs on the BCP efficiency. |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Plymouth University |
format |
Article in Journal/Newspaper |
author |
Rasse, Rafael Dall'Olmo, Giorgio |
author_facet |
Rasse, Rafael Dall'Olmo, Giorgio |
author_sort |
Rasse, Rafael |
title |
Do Oceanic Hypoxic Regions Act as Barriers for Sinking Particles? A Case Study in the Eastern Tropical North Atlantic |
title_short |
Do Oceanic Hypoxic Regions Act as Barriers for Sinking Particles? A Case Study in the Eastern Tropical North Atlantic |
title_full |
Do Oceanic Hypoxic Regions Act as Barriers for Sinking Particles? A Case Study in the Eastern Tropical North Atlantic |
title_fullStr |
Do Oceanic Hypoxic Regions Act as Barriers for Sinking Particles? A Case Study in the Eastern Tropical North Atlantic |
title_full_unstemmed |
Do Oceanic Hypoxic Regions Act as Barriers for Sinking Particles? A Case Study in the Eastern Tropical North Atlantic |
title_sort |
do oceanic hypoxic regions act as barriers for sinking particles? a case study in the eastern tropical north atlantic |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.sorbonne-universite.fr/hal-02421663 https://hal.sorbonne-universite.fr/hal-02421663/document https://hal.sorbonne-universite.fr/hal-02421663/file/Rasse_et_al-2019-Global_Biogeochemical_Cycles.pdf https://doi.org/10.1029/2019GB006305 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://hal.sorbonne-universite.fr/hal-02421663 Global Biogeochemical Cycles, 2019, ⟨10.1029/2019GB006305⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019GB006305 hal-02421663 https://hal.sorbonne-universite.fr/hal-02421663 https://hal.sorbonne-universite.fr/hal-02421663/document https://hal.sorbonne-universite.fr/hal-02421663/file/Rasse_et_al-2019-Global_Biogeochemical_Cycles.pdf doi:10.1029/2019GB006305 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2019GB006305 |
container_title |
Global Biogeochemical Cycles |
container_volume |
33 |
container_issue |
12 |
container_start_page |
1611 |
op_container_end_page |
1630 |
_version_ |
1781702704073015296 |