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| Titel |
Sensitivity of phytoplankton distributions to vertical mixing along a North Atlantic transect |
| VerfasserIn |
L. Hahn-Woernle, H. A. Dijkstra, H. J. Woerd |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 10, no. 6 ; Nr. 10, no. 6 (2014-12-11), S.993-1011 |
| Datensatznummer |
250117097
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| Publikation (Nr.) |
 copernicus.org/os-10-993-2014.pdf |
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| Zusammenfassung |
| 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. |
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