A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site
A one-dimensional model of Fe speciation and biogeochemistry, coupled with the General Ocean Turbulence Model (GOTM) and a NPZD-type ecosystem model, is applied for the Tropical Eastern North Atlantic Time-Series Observatory (TENATSO) site. Among diverse processes affecting Fe speciation, this study...
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ftdoajarticles:oai:doaj.org/article:4aedf194c2a84b5bab18b80c9eecd737 2023-05-15T17:32:03+02:00 A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site Y. Ye C. Völker D. A. Wolf-Gladrow 2009-10-01T00:00:00Z https://doaj.org/article/4aedf194c2a84b5bab18b80c9eecd737 EN eng Copernicus Publications http://www.biogeosciences.net/6/2041/2009/bg-6-2041-2009.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 https://doaj.org/article/4aedf194c2a84b5bab18b80c9eecd737 Biogeosciences, Vol 6, Iss 10, Pp 2041-2061 (2009) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2009 ftdoajarticles 2022-12-30T21:40:58Z A one-dimensional model of Fe speciation and biogeochemistry, coupled with the General Ocean Turbulence Model (GOTM) and a NPZD-type ecosystem model, is applied for the Tropical Eastern North Atlantic Time-Series Observatory (TENATSO) site. Among diverse processes affecting Fe speciation, this study is focusing on investigating the role of dust particles in removing dissolved iron (DFe) by a more complex description of particle aggregation and sinking, and explaining the abundance of organic Fe-binding ligands by modelling their origin and fate. The vertical distribution of different particle classes in the model shows high sensitivity to changing aggregation rates. Using the aggregation rates from the sensitivity study in this work, modelled particle fluxes are close to observations, with dust particles dominating near the surface and aggregates deeper in the water column. POC export at 1000 m is a little higher than regional sediment trap measurements, suggesting further improvement of modelling particle aggregation, sinking or remineralisation. Modelled strong ligands have a high abundance near the surface and decline rapidly below the deep chlorophyll maximum, showing qualitative similarity to observations. Without production of strong ligands, phytoplankton concentration falls to 0 within the first 2 years in the model integration, caused by strong Fe-limitation. A nudging of total weak ligands towards a constant value is required for reproducing the observed nutrient-like profiles, assuming a decay time of 7 years for weak ligands. This indicates that weak ligands have a longer decay time and therefore cannot be modelled adequately in a one-dimensional model. The modelled DFe profile is strongly influenced by particle concentration and vertical distribution, because the most important removal of DFe in deeper waters is colloid formation and aggregation. Redissolution of particulate iron is required to reproduce an observed DFe profile at TENATSO site. Assuming colloidal iron is mainly composed of inorganic ... Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles |
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collection |
Directory of Open Access Journals: DOAJ Articles |
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language |
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topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 Y. Ye C. Völker D. A. Wolf-Gladrow A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
A one-dimensional model of Fe speciation and biogeochemistry, coupled with the General Ocean Turbulence Model (GOTM) and a NPZD-type ecosystem model, is applied for the Tropical Eastern North Atlantic Time-Series Observatory (TENATSO) site. Among diverse processes affecting Fe speciation, this study is focusing on investigating the role of dust particles in removing dissolved iron (DFe) by a more complex description of particle aggregation and sinking, and explaining the abundance of organic Fe-binding ligands by modelling their origin and fate. The vertical distribution of different particle classes in the model shows high sensitivity to changing aggregation rates. Using the aggregation rates from the sensitivity study in this work, modelled particle fluxes are close to observations, with dust particles dominating near the surface and aggregates deeper in the water column. POC export at 1000 m is a little higher than regional sediment trap measurements, suggesting further improvement of modelling particle aggregation, sinking or remineralisation. Modelled strong ligands have a high abundance near the surface and decline rapidly below the deep chlorophyll maximum, showing qualitative similarity to observations. Without production of strong ligands, phytoplankton concentration falls to 0 within the first 2 years in the model integration, caused by strong Fe-limitation. A nudging of total weak ligands towards a constant value is required for reproducing the observed nutrient-like profiles, assuming a decay time of 7 years for weak ligands. This indicates that weak ligands have a longer decay time and therefore cannot be modelled adequately in a one-dimensional model. The modelled DFe profile is strongly influenced by particle concentration and vertical distribution, because the most important removal of DFe in deeper waters is colloid formation and aggregation. Redissolution of particulate iron is required to reproduce an observed DFe profile at TENATSO site. Assuming colloidal iron is mainly composed of inorganic ... |
format |
Article in Journal/Newspaper |
author |
Y. Ye C. Völker D. A. Wolf-Gladrow |
author_facet |
Y. Ye C. Völker D. A. Wolf-Gladrow |
author_sort |
Y. Ye |
title |
A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site |
title_short |
A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site |
title_full |
A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site |
title_fullStr |
A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site |
title_full_unstemmed |
A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site |
title_sort |
model of fe speciation and biogeochemistry at the tropical eastern north atlantic time-series observatory site |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://doaj.org/article/4aedf194c2a84b5bab18b80c9eecd737 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Biogeosciences, Vol 6, Iss 10, Pp 2041-2061 (2009) |
op_relation |
http://www.biogeosciences.net/6/2041/2009/bg-6-2041-2009.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 https://doaj.org/article/4aedf194c2a84b5bab18b80c9eecd737 |
_version_ |
1766129985797488640 |