The distinct nitrogen isotopic compositions of low and high molecular weight marine DON

To constrain the sources and cycling of bulk and size-fractionated marine dissolved organic nitrogen (DON), samples were collected for concentration and isotopic (δ15N) analysis from the western tropical North Atlantic Ocean as well as over the North Australian shelf. Bulk DON concentrations are typ...

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Bibliographic Details
Published in:Marine chemistry 2012-06, Vol.136-137, p.24-33
Main Authors: Knapp, Angela N., Sigman, Daniel M., Kustka, Adam B., Sañudo-Wilhelmy, Sergio A., Capone, Douglas G.
Format: Article
Language:English
Subjects:
accounting
Amazon River
Atlantic Ocean
Dissolved organic nitrogen
isotope fractionation
microorganisms
molecular weight
nitrogen fixation
Nitrogen isotopes
phytoplankton
primary productivity
Size fractionated organic matter
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Summary:To constrain the sources and cycling of bulk and size-fractionated marine dissolved organic nitrogen (DON), samples were collected for concentration and isotopic (δ15N) analysis from the western tropical North Atlantic Ocean as well as over the North Australian shelf. Bulk DON concentrations are typically between 4 and 6μM, with low molecular weight (LMW, i.e., 1000Da to
ISSN:0304-4203
1872-7581
DOI:10.1016/j.marchem.2012.05.001