In:
Geophysical Research Letters, American Geophysical Union (AGU), Vol. 44, No. 15 ( 2017-08-16), p. 7883-7891
Abstract:
Nitrite is a key intermediate in the biogeochemistry of low‐oxygen marine environments, including the loss of fixed nitrogen as dinitrogen gas and nitrous oxide. Nitrate reduction to nitrite coupled to reoxidation of nitrite to nitrate has been proposed as a cycle that can preserve bioavailable nitrogen in oxygen minimum zones. This cycle implies that nitrite oxidation occurs in the absence, or near absence, of oxygen. Nitrite oxidation is considered to be an obligately aerobic process, although it has been reported from anoxic waters. Here we report on the regulation of nitrite oxidation by oxygen and nitrite in natural assemblages from the oxygen minimum zone of the Eastern Tropical North Pacific. We show that natural assemblages have very high affinity for nitrite and that oxygen actually inhibits nitrite oxidation in anoxic samples. These findings have implications for the marine nitrogen budget now and in future scenarios of changing ocean conditions.
Type of Medium:
Online Resource
ISSN:
0094-8276
,
1944-8007
DOI:
10.1002/2017GL074355
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2017
detail.hit.zdb_id:
2021599-X
detail.hit.zdb_id:
7403-2
SSG:
16,13
Permalink
