Manganese in the west Atlantic Ocean in the context of the first global ocean circulation model of manganese
Dissolved manganese (Mn) is a biologically essential element. Moreover, its oxidised form is involved in removing itself and several other trace elements from ocean waters. Here we report the longest thus far (17 500 km length) full-depth ocean section of dissolved Mn in the west Atlantic Ocean, com...
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ftdoajarticles:oai:doaj.org/article:be3c82518ec54692a8e32af2ec96f637 2023-05-15T17:13:53+02:00 Manganese in the west Atlantic Ocean in the context of the first global ocean circulation model of manganese M. van Hulten R. Middag J.-C. Dutay H. de Baar M. Roy-Barman M. Gehlen A. Tagliabue A. Sterl 2017-03-01T00:00:00Z https://doi.org/10.5194/bg-14-1123-2017 https://doaj.org/article/be3c82518ec54692a8e32af2ec96f637 EN eng Copernicus Publications http://www.biogeosciences.net/14/1123/2017/bg-14-1123-2017.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-14-1123-2017 https://doaj.org/article/be3c82518ec54692a8e32af2ec96f637 Biogeosciences, Vol 14, Iss 5, Pp 1123-1152 (2017) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2017 ftdoajarticles https://doi.org/10.5194/bg-14-1123-2017 2022-12-30T22:39:53Z Dissolved manganese (Mn) is a biologically essential element. Moreover, its oxidised form is involved in removing itself and several other trace elements from ocean waters. Here we report the longest thus far (17 500 km length) full-depth ocean section of dissolved Mn in the west Atlantic Ocean, comprising 1320 data values of high accuracy. This is the GA02 transect that is part of the GEOTRACES programme, which aims to understand trace element distributions. The goal of this study is to combine these new observations with new, state-of-the-art, modelling to give a first assessment of the main sources and redistribution of Mn throughout the ocean. To this end, we simulate the distribution of dissolved Mn using a global-scale circulation model. This first model includes simple parameterisations to account for the sources, processes and sinks of Mn in the ocean. Oxidation and (photo)reduction, aggregation and settling, as well as biological uptake and remineralisation by plankton are included in the model. Our model provides, together with the observations, the following insights: – The high surface concentrations of manganese are caused by the combination of photoreduction and sources contributing to the upper ocean. The most important sources are sediments, dust, and, more locally, rivers. – Observations and model simulations suggest that surface Mn in the Atlantic Ocean moves downwards into the southward-flowing North Atlantic Deep Water (NADW), but because of strong removal rates there is no elevated concentration of Mn visible any more in the NADW south of 40° N. – The model predicts lower dissolved Mn in surface waters of the Pacific Ocean than the observed concentrations. The intense oxygen minimum zone (OMZ) in subsurface waters is deemed to be a major source of dissolved Mn also mixing upwards into surface waters, but the OMZ is not well represented by the model. Improved high-resolution simulation of the OMZ may solve this problem. – There is a mainly homogeneous background concentration of dissolved Mn ... Article in Journal/Newspaper NADW North Atlantic Deep Water North Atlantic Directory of Open Access Journals: DOAJ Articles Pacific Biogeosciences 14 5 1123 1152 |
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Open Polar |
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ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 M. van Hulten R. Middag J.-C. Dutay H. de Baar M. Roy-Barman M. Gehlen A. Tagliabue A. Sterl Manganese in the west Atlantic Ocean in the context of the first global ocean circulation model of manganese |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Dissolved manganese (Mn) is a biologically essential element. Moreover, its oxidised form is involved in removing itself and several other trace elements from ocean waters. Here we report the longest thus far (17 500 km length) full-depth ocean section of dissolved Mn in the west Atlantic Ocean, comprising 1320 data values of high accuracy. This is the GA02 transect that is part of the GEOTRACES programme, which aims to understand trace element distributions. The goal of this study is to combine these new observations with new, state-of-the-art, modelling to give a first assessment of the main sources and redistribution of Mn throughout the ocean. To this end, we simulate the distribution of dissolved Mn using a global-scale circulation model. This first model includes simple parameterisations to account for the sources, processes and sinks of Mn in the ocean. Oxidation and (photo)reduction, aggregation and settling, as well as biological uptake and remineralisation by plankton are included in the model. Our model provides, together with the observations, the following insights: – The high surface concentrations of manganese are caused by the combination of photoreduction and sources contributing to the upper ocean. The most important sources are sediments, dust, and, more locally, rivers. – Observations and model simulations suggest that surface Mn in the Atlantic Ocean moves downwards into the southward-flowing North Atlantic Deep Water (NADW), but because of strong removal rates there is no elevated concentration of Mn visible any more in the NADW south of 40° N. – The model predicts lower dissolved Mn in surface waters of the Pacific Ocean than the observed concentrations. The intense oxygen minimum zone (OMZ) in subsurface waters is deemed to be a major source of dissolved Mn also mixing upwards into surface waters, but the OMZ is not well represented by the model. Improved high-resolution simulation of the OMZ may solve this problem. – There is a mainly homogeneous background concentration of dissolved Mn ... |
format |
Article in Journal/Newspaper |
author |
M. van Hulten R. Middag J.-C. Dutay H. de Baar M. Roy-Barman M. Gehlen A. Tagliabue A. Sterl |
author_facet |
M. van Hulten R. Middag J.-C. Dutay H. de Baar M. Roy-Barman M. Gehlen A. Tagliabue A. Sterl |
author_sort |
M. van Hulten |
title |
Manganese in the west Atlantic Ocean in the context of the first global ocean circulation model of manganese |
title_short |
Manganese in the west Atlantic Ocean in the context of the first global ocean circulation model of manganese |
title_full |
Manganese in the west Atlantic Ocean in the context of the first global ocean circulation model of manganese |
title_fullStr |
Manganese in the west Atlantic Ocean in the context of the first global ocean circulation model of manganese |
title_full_unstemmed |
Manganese in the west Atlantic Ocean in the context of the first global ocean circulation model of manganese |
title_sort |
manganese in the west atlantic ocean in the context of the first global ocean circulation model of manganese |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/bg-14-1123-2017 https://doaj.org/article/be3c82518ec54692a8e32af2ec96f637 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_source |
Biogeosciences, Vol 14, Iss 5, Pp 1123-1152 (2017) |
op_relation |
http://www.biogeosciences.net/14/1123/2017/bg-14-1123-2017.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-14-1123-2017 https://doaj.org/article/be3c82518ec54692a8e32af2ec96f637 |
op_doi |
https://doi.org/10.5194/bg-14-1123-2017 |
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Biogeosciences |
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14 |
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5 |
container_start_page |
1123 |
op_container_end_page |
1152 |
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1766071076164468736 |