Nitric oxide (NO) in the oxygen minimum zone off Peru.

Lutterbeck, Hannah E., Arevalo-Martinez, Damian L. , Löscher, Carolin R. and Bange, Hermann W. (2018) Nitric oxide (NO) in the oxygen minimum zone off Peru. Deep Sea Research Part II: Topical Studies in Oceanography, 156 . pp. 148-154. DOI 10.1016/j.dsr2.2017.12.023.

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Nitric oxide (NO) is a short-lived compound of the marine nitrogen cycle. However, measurements of NO in seawater are analytically challenging and our knowledge about its oceanic distribution is, therefore, rudimentary. NO was measured in the oxygen minimum zone (OMZ) of the eastern tropical South Pacific Ocean (ETSP) off Peru during R/V Meteor cruise M93 in February/March 2013. NO concentrations ranged from close to or below the detection limit (0.5nmolL-1) in the surface layer to 9.5nmolL-1 in the OMZ. NO concentrations increased significantly when oxygen (O2) concentrations dropped below 1-2μmolL-1. We found positive correlations between NO and NO2 - as well as between NO and the abundance of archaeal amoA, a marker gene for archaeal nitrifiers. No trends between NO and nirS and hzo, marker genes for canonical denitrification and anammox, respectively, were found. To this end, we conclude that NO off Peru was mainly produced by archaeal nitrifier-denitrification at low O2 concentrations in the OMZ.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/H2020/04272
Keywords: Nitric oxide; N cycle; OMZ; ETSP
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R07
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > SFB 754 > B4
OceanRep > SFB 754
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
Publisher: Elsevier
Projects: SFB754, Future Ocean, NITROX, InGOS
Date Deposited: 29 Jan 2018 12:59
Last Modified: 08 Nov 2023 05:20

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