Physiological constrains on Sverdrup's Critical-Depth-Hypothesis: the influences of dark respiration and sinking
Discussions on the controls initiating the onset of the phytoplankton spring bloom in particular in the North Atlantic have since Sverdrup been dominated by the role of physical and biological drivers. Undoubtedly, these drivers play an important role in phytoplankton dynamics and thus the onset of...
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ftdtupubl:oai:pure.atira.dk:publications/72840196-f036-4077-9e28-ffd5f1b4d036 2024-06-23T07:55:12+00:00 Physiological constrains on Sverdrup's Critical-Depth-Hypothesis: the influences of dark respiration and sinking Lindemann, Christian Backhaus, Jan O. St. John, Michael 2015 application/pdf https://orbit.dtu.dk/en/publications/72840196-f036-4077-9e28-ffd5f1b4d036 https://doi.org/10.1093/icesjms/fsv046 https://backend.orbit.dtu.dk/ws/files/107881508/Publishers_version.pdf eng eng info:eu-repo/grantAgreement/EC/FP7/264933 https://orbit.dtu.dk/en/publications/72840196-f036-4077-9e28-ffd5f1b4d036 info:eu-repo/semantics/openAccess Lindemann , C , Backhaus , J O & St. John , M 2015 , ' Physiological constrains on Sverdrup's Critical-Depth-Hypothesis: the influences of dark respiration and sinking ' , ICES Journal of Marine Science , vol. 72 , no. 6 , pp. 1942-1951 . https://doi.org/10.1093/icesjms/fsv046 article 2015 ftdtupubl https://doi.org/10.1093/icesjms/fsv046 2024-06-11T14:43:21Z Discussions on the controls initiating the onset of the phytoplankton spring bloom in particular in the North Atlantic have since Sverdrup been dominated by the role of physical and biological drivers. Undoubtedly, these drivers play an important role in phytoplankton dynamics and thus the onset of the spring bloom. However, they neglect the cells ability to modify vital rates in response to changes in the external environment. In this study, we use a non-hydrostatic convection model coupled to an Individual-Based-Model to simulate changes phytoplankton cells during the transition from winter conditions as driven by convective mixing, and the onset of thermal stratification resulting in the spring bloom. The comparison between a simulation using a standard fixed rate approach in line with the original Sverdrup hypothesis and a simulation parameterized to include variable respiration and sinking rates showed that the latter approach was able to capture the observed phytoplankton concentration during deep convective mixing, the timing and magnitude of the spring bloom aswell as simulating realistic physiological rates. In contrast, the model employing fixed rate parameterizations could only replicate field observations when employing unrealistic parameter values. These results highlight the necessity to consider not only the physical and biological external controls determining phytoplankton dynamics but also the cells ability to modify critical physiological rates in response to external constraints. Understanding these adaptive qualities will be of increasing importance in the future as species assemblages and physical controls change with changing climate Article in Journal/Newspaper North Atlantic Technical University of Denmark: DTU Orbit ICES Journal of Marine Science 72 6 1942 1951 |
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Open Polar |
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Technical University of Denmark: DTU Orbit |
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ftdtupubl |
language |
English |
description |
Discussions on the controls initiating the onset of the phytoplankton spring bloom in particular in the North Atlantic have since Sverdrup been dominated by the role of physical and biological drivers. Undoubtedly, these drivers play an important role in phytoplankton dynamics and thus the onset of the spring bloom. However, they neglect the cells ability to modify vital rates in response to changes in the external environment. In this study, we use a non-hydrostatic convection model coupled to an Individual-Based-Model to simulate changes phytoplankton cells during the transition from winter conditions as driven by convective mixing, and the onset of thermal stratification resulting in the spring bloom. The comparison between a simulation using a standard fixed rate approach in line with the original Sverdrup hypothesis and a simulation parameterized to include variable respiration and sinking rates showed that the latter approach was able to capture the observed phytoplankton concentration during deep convective mixing, the timing and magnitude of the spring bloom aswell as simulating realistic physiological rates. In contrast, the model employing fixed rate parameterizations could only replicate field observations when employing unrealistic parameter values. These results highlight the necessity to consider not only the physical and biological external controls determining phytoplankton dynamics but also the cells ability to modify critical physiological rates in response to external constraints. Understanding these adaptive qualities will be of increasing importance in the future as species assemblages and physical controls change with changing climate |
format |
Article in Journal/Newspaper |
author |
Lindemann, Christian Backhaus, Jan O. St. John, Michael |
spellingShingle |
Lindemann, Christian Backhaus, Jan O. St. John, Michael Physiological constrains on Sverdrup's Critical-Depth-Hypothesis: the influences of dark respiration and sinking |
author_facet |
Lindemann, Christian Backhaus, Jan O. St. John, Michael |
author_sort |
Lindemann, Christian |
title |
Physiological constrains on Sverdrup's Critical-Depth-Hypothesis: the influences of dark respiration and sinking |
title_short |
Physiological constrains on Sverdrup's Critical-Depth-Hypothesis: the influences of dark respiration and sinking |
title_full |
Physiological constrains on Sverdrup's Critical-Depth-Hypothesis: the influences of dark respiration and sinking |
title_fullStr |
Physiological constrains on Sverdrup's Critical-Depth-Hypothesis: the influences of dark respiration and sinking |
title_full_unstemmed |
Physiological constrains on Sverdrup's Critical-Depth-Hypothesis: the influences of dark respiration and sinking |
title_sort |
physiological constrains on sverdrup's critical-depth-hypothesis: the influences of dark respiration and sinking |
publishDate |
2015 |
url |
https://orbit.dtu.dk/en/publications/72840196-f036-4077-9e28-ffd5f1b4d036 https://doi.org/10.1093/icesjms/fsv046 https://backend.orbit.dtu.dk/ws/files/107881508/Publishers_version.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Lindemann , C , Backhaus , J O & St. John , M 2015 , ' Physiological constrains on Sverdrup's Critical-Depth-Hypothesis: the influences of dark respiration and sinking ' , ICES Journal of Marine Science , vol. 72 , no. 6 , pp. 1942-1951 . https://doi.org/10.1093/icesjms/fsv046 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/264933 https://orbit.dtu.dk/en/publications/72840196-f036-4077-9e28-ffd5f1b4d036 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/icesjms/fsv046 |
container_title |
ICES Journal of Marine Science |
container_volume |
72 |
container_issue |
6 |
container_start_page |
1942 |
op_container_end_page |
1951 |
_version_ |
1802647692435783680 |