Dissolved Organic Matter Fluorescence as a Tracer of Upwelling and Microbial Activities in Two Cyclonic Eddies in the Eastern Tropical North Atlantic
Mesoscale eddies are frequently observed in the Eastern Tropical North Atlantic (ETNA), yet their effects on the transport and distribution of biogeochemical solutes, and specifically on the production and remineralization of dissolved organic matter (DOM) remain difficult to elucidate. Here, we inv...
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.science/hal-04198204 https://hal.science/hal-04198204/document https://hal.science/hal-04198204/file/Devresse2023.pdf https://doi.org/10.1029/2023jc019821 |
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ftinsu:oai:HAL:hal-04198204v1 2023-11-05T03:43:51+01:00 Dissolved Organic Matter Fluorescence as a Tracer of Upwelling and Microbial Activities in Two Cyclonic Eddies in the Eastern Tropical North Atlantic Devresse, Quentin Becker, Kevin, W Dilmahamod, Ahmad, Fehmi Ortega‐retuerta, Eva Engel, Anja Laboratoire d'Océanographie Microbienne (LOMIC) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Helmholtz Centre for Ocean Research Kiel (GEOMAR) 2023 https://hal.science/hal-04198204 https://hal.science/hal-04198204/document https://hal.science/hal-04198204/file/Devresse2023.pdf https://doi.org/10.1029/2023jc019821 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2023jc019821 hal-04198204 https://hal.science/hal-04198204 https://hal.science/hal-04198204/document https://hal.science/hal-04198204/file/Devresse2023.pdf doi:10.1029/2023jc019821 info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-04198204 Journal of Geophysical Research. Oceans, 2023, 128 (8), pp.e2023JC019821. ⟨10.1029/2023jc019821⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology info:eu-repo/semantics/article Journal articles 2023 ftinsu https://doi.org/10.1029/2023jc019821 2023-10-11T16:23:36Z Mesoscale eddies are frequently observed in the Eastern Tropical North Atlantic (ETNA), yet their effects on the transport and distribution of biogeochemical solutes, and specifically on the production and remineralization of dissolved organic matter (DOM) remain difficult to elucidate. Here, we investigated the submesoscale variability of chromophoric DOM (CDOM) and fluorescent DOM (FDOM) together with microbial production and remineralization processes in two cyclonic eddies (CEs) in the ETNA during summer and winter 2019. One CE, formed near the coast off Mauritania during the post-upwelling season, was sampled along a ∼900 km zonal corridor between Mauritania and the Cape Verde Islands. The other CE, formed nearby Brava Island, was out of coastal influence. Four fluorescent components were identified with parallel factor analysis, two humic-like, and two protein-like components. Humic-like FDOM components correlated to optode-based community respiration and were also good indicators of upwelling associated with the Brava Island CE as they correlated to physical parameters (e.g., temperature) and to dissolved inorganic nitrogen. The tryptophan-like FDOM components correlated with the carbon and nitrogen content of semi-labile DOM, phytoplankton biomass, community respiration, and bacterial production. Overall, our study revealed that DOM optical properties are suitable for tracing freshly produced organic matter and the transport of remineralized DOM within offshore eddies. Article in Journal/Newspaper North Atlantic Institut national des sciences de l'Univers: HAL-INSU Journal of Geophysical Research: Oceans 128 8 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology Devresse, Quentin Becker, Kevin, W Dilmahamod, Ahmad, Fehmi Ortega‐retuerta, Eva Engel, Anja Dissolved Organic Matter Fluorescence as a Tracer of Upwelling and Microbial Activities in Two Cyclonic Eddies in the Eastern Tropical North Atlantic |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
description |
Mesoscale eddies are frequently observed in the Eastern Tropical North Atlantic (ETNA), yet their effects on the transport and distribution of biogeochemical solutes, and specifically on the production and remineralization of dissolved organic matter (DOM) remain difficult to elucidate. Here, we investigated the submesoscale variability of chromophoric DOM (CDOM) and fluorescent DOM (FDOM) together with microbial production and remineralization processes in two cyclonic eddies (CEs) in the ETNA during summer and winter 2019. One CE, formed near the coast off Mauritania during the post-upwelling season, was sampled along a ∼900 km zonal corridor between Mauritania and the Cape Verde Islands. The other CE, formed nearby Brava Island, was out of coastal influence. Four fluorescent components were identified with parallel factor analysis, two humic-like, and two protein-like components. Humic-like FDOM components correlated to optode-based community respiration and were also good indicators of upwelling associated with the Brava Island CE as they correlated to physical parameters (e.g., temperature) and to dissolved inorganic nitrogen. The tryptophan-like FDOM components correlated with the carbon and nitrogen content of semi-labile DOM, phytoplankton biomass, community respiration, and bacterial production. Overall, our study revealed that DOM optical properties are suitable for tracing freshly produced organic matter and the transport of remineralized DOM within offshore eddies. |
author2 |
Laboratoire d'Océanographie Microbienne (LOMIC) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Helmholtz Centre for Ocean Research Kiel (GEOMAR) |
format |
Article in Journal/Newspaper |
author |
Devresse, Quentin Becker, Kevin, W Dilmahamod, Ahmad, Fehmi Ortega‐retuerta, Eva Engel, Anja |
author_facet |
Devresse, Quentin Becker, Kevin, W Dilmahamod, Ahmad, Fehmi Ortega‐retuerta, Eva Engel, Anja |
author_sort |
Devresse, Quentin |
title |
Dissolved Organic Matter Fluorescence as a Tracer of Upwelling and Microbial Activities in Two Cyclonic Eddies in the Eastern Tropical North Atlantic |
title_short |
Dissolved Organic Matter Fluorescence as a Tracer of Upwelling and Microbial Activities in Two Cyclonic Eddies in the Eastern Tropical North Atlantic |
title_full |
Dissolved Organic Matter Fluorescence as a Tracer of Upwelling and Microbial Activities in Two Cyclonic Eddies in the Eastern Tropical North Atlantic |
title_fullStr |
Dissolved Organic Matter Fluorescence as a Tracer of Upwelling and Microbial Activities in Two Cyclonic Eddies in the Eastern Tropical North Atlantic |
title_full_unstemmed |
Dissolved Organic Matter Fluorescence as a Tracer of Upwelling and Microbial Activities in Two Cyclonic Eddies in the Eastern Tropical North Atlantic |
title_sort |
dissolved organic matter fluorescence as a tracer of upwelling and microbial activities in two cyclonic eddies in the eastern tropical north atlantic |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04198204 https://hal.science/hal-04198204/document https://hal.science/hal-04198204/file/Devresse2023.pdf https://doi.org/10.1029/2023jc019821 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-04198204 Journal of Geophysical Research. Oceans, 2023, 128 (8), pp.e2023JC019821. ⟨10.1029/2023jc019821⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2023jc019821 hal-04198204 https://hal.science/hal-04198204 https://hal.science/hal-04198204/document https://hal.science/hal-04198204/file/Devresse2023.pdf doi:10.1029/2023jc019821 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2023jc019821 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
128 |
container_issue |
8 |
_version_ |
1781702665376366592 |