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...
Published in: | Biogeosciences |
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Language: | English |
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Copernicus Publications (EGU)
2009
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Online Access: | https://oceanrep.geomar.de/id/eprint/19727/ https://oceanrep.geomar.de/id/eprint/19727/1/bg-6-2041-2009.pdf https://oceanrep.geomar.de/id/eprint/19727/2/bg-6-2041-2009-supplement.pdf https://doi.org/10.5194/bg-6-2041-2009 |
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ftoceanrep:oai:oceanrep.geomar.de:19727 2023-05-15T17:32:08+02:00 A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site Ye, Y. Völker, Christoph Wolf-Gladrow, D. A. 2009 text https://oceanrep.geomar.de/id/eprint/19727/ https://oceanrep.geomar.de/id/eprint/19727/1/bg-6-2041-2009.pdf https://oceanrep.geomar.de/id/eprint/19727/2/bg-6-2041-2009-supplement.pdf https://doi.org/10.5194/bg-6-2041-2009 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/19727/1/bg-6-2041-2009.pdf https://oceanrep.geomar.de/id/eprint/19727/2/bg-6-2041-2009-supplement.pdf Ye, Y., Völker, C. and Wolf-Gladrow, D. A. (2009) A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site. Open Access Biogeosciences (BG), 6 (10). pp. 2041-2061. DOI 10.5194/bg-6-2041-2009 <https://doi.org/10.5194/bg-6-2041-2009>. doi:10.5194/bg-6-2041-2009 cc_by info:eu-repo/semantics/openAccess Article PeerReviewed 2009 ftoceanrep https://doi.org/10.5194/bg-6-2041-2009 2023-04-07T15:06:58Z 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 OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Biogeosciences 6 10 2041 2061 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
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 |
Ye, Y. Völker, Christoph Wolf-Gladrow, D. A. |
spellingShingle |
Ye, Y. Völker, Christoph Wolf-Gladrow, D. A. A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site |
author_facet |
Ye, Y. Völker, Christoph Wolf-Gladrow, D. A. |
author_sort |
Ye, Y. |
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 (EGU) |
publishDate |
2009 |
url |
https://oceanrep.geomar.de/id/eprint/19727/ https://oceanrep.geomar.de/id/eprint/19727/1/bg-6-2041-2009.pdf https://oceanrep.geomar.de/id/eprint/19727/2/bg-6-2041-2009-supplement.pdf https://doi.org/10.5194/bg-6-2041-2009 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/19727/1/bg-6-2041-2009.pdf https://oceanrep.geomar.de/id/eprint/19727/2/bg-6-2041-2009-supplement.pdf Ye, Y., Völker, C. and Wolf-Gladrow, D. A. (2009) A model of Fe speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site. Open Access Biogeosciences (BG), 6 (10). pp. 2041-2061. DOI 10.5194/bg-6-2041-2009 <https://doi.org/10.5194/bg-6-2041-2009>. doi:10.5194/bg-6-2041-2009 |
op_rights |
cc_by info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-6-2041-2009 |
container_title |
Biogeosciences |
container_volume |
6 |
container_issue |
10 |
container_start_page |
2041 |
op_container_end_page |
2061 |
_version_ |
1766130099972734976 |