Sensitivity of phytoplankton distributions to vertical mixing along a North Atlantic transect
Using in situ data of upper ocean vertical mixing along a transect in the North Atlantic and a one-dimensional phytoplankton growth model, we study the sensitivity of the surface phytoplankton concentration to vertical mixing distributions. The study is divided into two parts. In the first part, the...
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ftcopernicus:oai:publications.copernicus.org:os24087 2023-05-15T17:28:43+02:00 Sensitivity of phytoplankton distributions to vertical mixing along a North Atlantic transect Hahn-Woernle, L. Dijkstra, H. A. Woerd, H. J. 2018-01-15 application/pdf https://doi.org/10.5194/os-10-993-2014 https://os.copernicus.org/articles/10/993/2014/ eng eng doi:10.5194/os-10-993-2014 https://os.copernicus.org/articles/10/993/2014/ eISSN: 1812-0792 Text 2018 ftcopernicus https://doi.org/10.5194/os-10-993-2014 2020-07-20T16:24:50Z Using in situ data of upper ocean vertical mixing along a transect in the North Atlantic and a one-dimensional phytoplankton growth model, we study the sensitivity of the surface phytoplankton concentration to vertical mixing distributions. The study is divided into two parts. In the first part, the model is calibrated to the observations. The optical model parameters are determined from measurements of the light attenuation. The biological parameters are calibrated to three different reference stations with observed vertical profiles of the chlorophyll a (Chl a ) concentration and the nutrient concentration. In the second part, the sensitivity of the three model calibrations to the vertical mixing is studied. Therefore measured vertical mixing profiles are applied to the model. These mixing profiles are based on the measurements along the transect and are treated as a set of possible mixing situations of the North Atlantic. Results show that shifts in vertical mixing are able to induce a transition from an upper chlorophyll maximum to a deep one and vice versa. Furthermore, a clear correlation between the surface phytoplankton concentration and the mixing induced nutrient flux is found for nutrient-limited cases. This may open up the possibility to extract characteristics of vertical mixing from satellite ocean colour data using data-assimilation methods. Text North Atlantic Copernicus Publications: E-Journals Ocean Science 10 6 993 1011 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Using in situ data of upper ocean vertical mixing along a transect in the North Atlantic and a one-dimensional phytoplankton growth model, we study the sensitivity of the surface phytoplankton concentration to vertical mixing distributions. The study is divided into two parts. In the first part, the model is calibrated to the observations. The optical model parameters are determined from measurements of the light attenuation. The biological parameters are calibrated to three different reference stations with observed vertical profiles of the chlorophyll a (Chl a ) concentration and the nutrient concentration. In the second part, the sensitivity of the three model calibrations to the vertical mixing is studied. Therefore measured vertical mixing profiles are applied to the model. These mixing profiles are based on the measurements along the transect and are treated as a set of possible mixing situations of the North Atlantic. Results show that shifts in vertical mixing are able to induce a transition from an upper chlorophyll maximum to a deep one and vice versa. Furthermore, a clear correlation between the surface phytoplankton concentration and the mixing induced nutrient flux is found for nutrient-limited cases. This may open up the possibility to extract characteristics of vertical mixing from satellite ocean colour data using data-assimilation methods. |
format |
Text |
author |
Hahn-Woernle, L. Dijkstra, H. A. Woerd, H. J. |
spellingShingle |
Hahn-Woernle, L. Dijkstra, H. A. Woerd, H. J. Sensitivity of phytoplankton distributions to vertical mixing along a North Atlantic transect |
author_facet |
Hahn-Woernle, L. Dijkstra, H. A. Woerd, H. J. |
author_sort |
Hahn-Woernle, L. |
title |
Sensitivity of phytoplankton distributions to vertical mixing along a North Atlantic transect |
title_short |
Sensitivity of phytoplankton distributions to vertical mixing along a North Atlantic transect |
title_full |
Sensitivity of phytoplankton distributions to vertical mixing along a North Atlantic transect |
title_fullStr |
Sensitivity of phytoplankton distributions to vertical mixing along a North Atlantic transect |
title_full_unstemmed |
Sensitivity of phytoplankton distributions to vertical mixing along a North Atlantic transect |
title_sort |
sensitivity of phytoplankton distributions to vertical mixing along a north atlantic transect |
publishDate |
2018 |
url |
https://doi.org/10.5194/os-10-993-2014 https://os.copernicus.org/articles/10/993/2014/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: 1812-0792 |
op_relation |
doi:10.5194/os-10-993-2014 https://os.copernicus.org/articles/10/993/2014/ |
op_doi |
https://doi.org/10.5194/os-10-993-2014 |
container_title |
Ocean Science |
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10 |
container_issue |
6 |
container_start_page |
993 |
op_container_end_page |
1011 |
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1766121579091066880 |