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Sensitivity of Phytoplankton Distributions to Vertical Mixing Along a North Atlantic Transect : Volume 10, Issue 6 (11/12/2014)

By Hahn-woernle, L.

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Book Id: WPLBN0004020239
Format Type: PDF Article :
File Size: Pages 19
Reproduction Date: 2015

Title: Sensitivity of Phytoplankton Distributions to Vertical Mixing Along a North Atlantic Transect : Volume 10, Issue 6 (11/12/2014)  
Author: Hahn-woernle, L.
Volume: Vol. 10, Issue 6
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Van Der Woerd, H. J., Dijkstra, H. A., & Hahn-Woernle, L. (2014). Sensitivity of Phytoplankton Distributions to Vertical Mixing Along a North Atlantic Transect : Volume 10, Issue 6 (11/12/2014). Retrieved from

Description: Institute for Marine and Atmospheric Research Utrecht (IMAU), Dept. of Physics and Astronomy, Utrecht University, P.O. Box 80.005, 3508 TA Utrecht, the Netherlands. 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.

Sensitivity of phytoplankton distributions to vertical mixing along a North Atlantic transect

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