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Model Study on Horizontal Variability of Nutrient N/P Ratio in the Baltic Sea and Its Impacts on Primary Production, Nitrogen Fixation and Nutrient Limitation : Volume 9, Issue 1 (31/01/2012)

By Wan, Z.

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Book Id: WPLBN0003984222
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Model Study on Horizontal Variability of Nutrient N/P Ratio in the Baltic Sea and Its Impacts on Primary Production, Nitrogen Fixation and Nutrient Limitation : Volume 9, Issue 1 (31/01/2012)  
Author: Wan, Z.
Volume: Vol. 9, Issue 1
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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Maar, M., She, J., Jonasson, L., Wan, Z., & Bi, H. (2012). Model Study on Horizontal Variability of Nutrient N/P Ratio in the Baltic Sea and Its Impacts on Primary Production, Nitrogen Fixation and Nutrient Limitation : Volume 9, Issue 1 (31/01/2012). Retrieved from

Description: Centre for Ocean and Ice, Danish Meteorological Institute, Lyngbyvej 100, 2100 Copenhagen, Denmark. The analysis of measured nutrient concentrations suggests that the ratio of dissolved inorganic nitrogen (DIN) alteration before and after spring blooms relative to the alteration of dissolved inorganic phosphorus (DIP) remains quite constant over the years (2000~2009). This ratio differs from the Redfield ratio and varies from 6.6 : 1 to 41.5 : 1 across basins within the Baltic Sea. If the found N/P ratios are indicators of phytoplankton stoichiometry, this would affect nutrient cycles in ecosystem models. We therefore tested the effects of using horizontally variable N/P ratio instead of fixed ratio (N/P = 10 : 1 or 16 : 1) on phytoplankton uptake and remineralization in a 3-D physical-biogeochemical coupled model ERGOM. The model results using the variable N/P ratio show systematical improvements in model performance in comparison with the fixed ratios. In addition, variable N/P ratios greatly affected the model estimated primary production, nitrogen fixation and nutrient limitation, which highlights the importance of using an accurate N/P ratio.

Model study on horizontal variability of nutrient N/P ratio in the Baltic Sea and its impacts on primary production, nitrogen fixation and nutrient limitation

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