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Nitrogen uptake and regeneration pathways in the equatorial Pacific: a basin scale modeling study by Wang, X. J.; Murtugudde, R.; Le Borgne, R. is a Environmental Science article available to read on EtoBox.

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Abstract. It is well known that most primary production is fueled by regenerated nitrogen in the open ocean. Therefore, studying the nitrogen cycle by focusing on uptake and regeneration pathways would advance our understanding of nitrogen dynamics in the marine ecosystem. Here, we carry out a basin-scale modeling study, by assessing model simulations of nitrate and ammonium, and rates of nitrate uptake, ammonium uptake and regeneration in the equatorial Pacific. Model-data comparisons show that the model is able to reproduce many observed features of nitrate, ammonium, such as the deep ammonium maximum (DAM). The model also reproduces the observed de-coupling of ammonium uptake and regeneration, i.e., regeneration rate greater than uptake rate in the lower euphotic zone. The de-coupling largely explains the observed DAM in the equatorial Pacific Ocean. Our study indicates that zooplankton excretion and remineralization of organic nitrogen play a different role in nitrogen regeneration. Rates of zooplankton excretion vary from <0.01 mmol m−3 d−1 to 0.1 mmol m−3 d−1 in the upper euphotic zone while rates of remineralization fall within a narrow range (0.015–0.025 mmol m−3 d−1 . Zoop

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Author

Wang, X. J.; Murtugudde, R.; Le Borgne, R.

Publisher

Copernicus GmbH; Göttingen: Copernicus Publ. (ISSN 1726-4189)

Published

2009

Language

EN

Field

Environmental Science (Physical Sciences)