Articles | Volume 14, issue 4
Biogeosciences, 14, 1021–1038, 2017
Biogeosciences, 14, 1021–1038, 2017

Research article 03 Mar 2017

Research article | 03 Mar 2017

Quantification of multiple simultaneously occurring nitrogen flows in the euphotic ocean

Min Nina Xu et al.

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Cited articles

Beman, J. M., Popp, B. N., and Alford, S. E.: Quantification of ammonia oxidation rates and ammonia-oxidizing archaea and bacteria at high resolution in the Gulf of California and eastern tropical North Pacific Ocean, Limnol. Oceanogr., 57, 711–726,, 2012.
Blackburn, T. H.: Method for Measuring Rates of NH4+ Turnover in Anoxic Marine Sediments, Using a 15N-NH4+ Dilution Technique, Appl. Environ. Microbiol., 37, 760–765, 1979.
Braman, R. S. and Hendrix, S. A.: Nanogram nitrite and nitrate determination in environmental and biological materials by vanadium (III) reduction with chemiluminescence detection, Anal. Chem., 61, 2715–2718,, 1989.
Bronk, D., Killberg-Thoreson, L., Sipler, R., Mulholland, M., Roberts, Q., Bernhardt, P., Garrett, M., O'Neil, J., and Heil, C.: Nitrogen uptake and regeneration (ammonium regeneration, nitrification and photoproduction) in waters of the West Florida Shelf prone to blooms of Karenia brevis, Harmful Algae, 38, 50–62,, 2014.
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Short summary
To resolve multiple N transformation rates, we proposed an innovative “isotope matrix method” to simultaneously derive rates for multiple transformations. This method was designed specifically for incubations in the euphotic zone under simulated in situ light conditions and minimized potential biases caused by non-targeted processes. The method facilitates simple post hoc analysis of data and can be used to probe specific effects of environmental factors on the rates of interactive N processes.
Final-revised paper