Hydroxylamine as a potential indicator of nitrification in the open ocean.

Korth, Frederike , Kock, Annette, Arevalo-Martinez, Damian L. and Bange, Hermann W. (2019) Hydroxylamine as a potential indicator of nitrification in the open ocean. Geophysical Research Letters, 46 (4). pp. 2158-2166. DOI 10.1029/2018GL080466.

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Abstract

Hydroxylamine (NH 2 OH), a short-lived intermediate in the nitrogen cycle, is a potential precursor of nitrous oxide (N 2 O) in the ocean. However, measurements of NH 2 OH in the ocean are sparse. Here we present a data set of depth profiles of NH 2 OH from the equatorial Atlantic Ocean and the eastern tropical South Pacific and compare it to N 2 O, nitrate, and nitrite profiles under varying oxygen conditions. The presence of NH 2 OH in surface waters points toward surface nitrification in the upper 100 m. Overall, we found a ratio of 1:3 between NH 2 OH and N 2 O in open ocean areas when oxygen concentrations were >50 μmol/L. In the equatorial Atlantic Ocean and the open ocean eastern tropical South Pacific, where nitrification is the dominant N 2 O production pathway, stepwise multiple regressions demonstrated that N 2 O, NH 2 OH, and nitrate concentrations were highly correlated, suggesting that NH 2 OH is a potential indicator for nitrification.

Document Type: Article
Keywords: Amines; Nitrates; Nitrification; Nitrogen oxides; Oxygen; Tropics
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > SFB 754
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2018GL080466
ISSN: 0094-8276
Projects: SFB754, SOPRAN, MEMENTO
Expeditions/Models/Experiments:
Date Deposited: 04 Mar 2019 12:46
Last Modified: 16 Apr 2019 12:18
URI: http://oceanrep.geomar.de/id/eprint/45967

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