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N/P Ratio of Nutrient Uptake in the Baltic Sea : Volume 8, Issue 3 (10/06/2011)

By Wan, Z.

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Book Id: WPLBN0003988244
Format Type: PDF Article :
File Size: Pages 27
Reproduction Date: 2015

Title: N/P Ratio of Nutrient Uptake in the Baltic Sea : Volume 8, Issue 3 (10/06/2011)  
Author: Wan, Z.
Volume: Vol. 8, Issue 3
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Bi, H., Jonasson, L., & Wan, Z. (2011). N/P Ratio of Nutrient Uptake in the Baltic Sea : Volume 8, Issue 3 (10/06/2011). Retrieved from

Description: Centre for Ocean and Ice, Danish Meteorological Institute, Lyngbyvey 100, 2100 Copenhagen, Denmark. The N/P ratio of nutrient uptake, i.e., the ratio of dissolved inorganic nitrogen (DIN) to dissolved inorganic phosphorus (DIP) taken by primary producers, varies in different basins and in different seasons in the Baltic Sea. The N/P ratio of nutrient alteration fore and after spring blooms is not same as the N/P ratio of nutrient uptake, but the former can be regarded as an indicator for the later in the Baltic Sea. Based on the observed N/P ratio of nutrient alteration, we hypothesize a non-Redfield N/P ratio of nutrient uptake. The 3D-ecosystem model ERGOM coupled with the circulation model DMI-BSHcmod was used to test the hypothesis. When the Redfield ratio was used in the model, the DIP surplus after spring blooms was too high and resulted in the overly growth of cyanobacteria and too much nitrogen fixation. When the non-Redfield ratio was used in the model, the corresponding problem tended to disappear. In summary, we show that: (1) the Redfield N/P ratio of nutrient uptake in the Baltic Sea tends to be too high; (2) a lower N/P ratio 10:1 appears to work better than the Redfield value; and (3) the N/P ratio of nutrient uptake in the Baltic Proper during spring blooms is around 6:1.

N/P ratio of nutrient uptake in the Baltic Sea

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