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Korth, Frederike; Kock, Annette; Arévalo-Martínez, Damian L; Bange, Hermann Werner (2019): Hydroxylamine as a potential indicator of nitrification in the open ocean. PANGAEA, (dataset in review), Supplement to: Korth, F et al. (2019): Hydroxylamine as a Potential Indicator of Nitrification in the Open Ocean. Geophysical Research Letters, 46(4), 2158-2166,

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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.
water column
German Science Foundation (DFG), grant/award no. 27542298: Climate - Biogeochemistry Interactions in the Tropical Ocean
Median Latitude: -7.459692 * Median Longitude: -62.363519 * South-bound Latitude: -16.750000 * West-bound Longitude: -85.950000 * North-bound Latitude: 4.000000 * East-bound Longitude: -23.000000
Date/Time Start: 2011-05-30T00:00:00 * Date/Time End: 2012-12-06T00:00:00
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