Modeling organic iron-binding ligands in a three-dimensional biogeochemical ocean model.
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Most dissolved iron in the ocean is bound to organic molecules with strong conditional stability constants, known as ligands that are found at concentrations ranging from 0.2 to more than 10 nmol L− 1. In this work we report the first mechanistic description of ligand dynamics in two three-dimensional models of ocean biogeochemistry and circulation. The model for ligands is based on the concept that ligands are produced both from organic matter remineralization and phytoplankton processes, and that they are lost through bacterial and photochemical degradation, as well as aggregation and to some extent in the process of phytoplankton uptake of ligand-bound iron. A comparison with a compilation of in-situ measurements shows that the model is able to reproduce some large-scale features of the observations, such as a decrease in ligand concentrations along the conveyor belt circulation in the deep ocean, lower surface and subsurface values in the Southern Ocean, or higher values in the .....
Essential Ocean Variables (EOV)Dissolved organic carbon
Best Practice TypeBest Practice
CitationVölker, C. and Tagliabue, A. (2015) Modeling organic iron-binding ligands in a three-dimensional biogeochemical ocean model. Marine Chemistry, 173, pp.67-77. DOI: https://doi.org/10.1016/j.marchem.2014.11.008
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