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Scholz, Florian (2016): Iron and Aluminium measured from Go-Flo bottle samples during METEOR cruise M92. PANGAEA,, Supplement to: Scholz, Florian; Löscher, Carolin R; Fiskal, Annika; Sommer, Stefan; Hensen, Christian; Lomnitz, Ulrike; Wuttig, Kathrin; Göttlicher, Jörg; Kossel, Elke; Steininger, F F; Canfield, Donald E (2016): Nitrate-dependent iron oxidation limits iron transport in anoxic ocean regions. Earth and Planetary Science Letters, 454, 272-281,

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Iron is an essential element for life on Earth and limits primary production in large parts of the ocean. Oxygen-free continental margin sediments represent an important source of bioavailable iron to the ocean, yet little of the iron released from the seabed reaches the productive sea surface. Even in the anoxic water of oxygen minimum zones, where iron solubility should be enhanced, most of the iron is rapidly re-precipitated. To constrain the mechanism(s) of iron removal in anoxic ocean regions we explored the sediment and water in the oxygen minimum zone off Peru. During our sampling campaign the water column featured two distinct redox boundaries separating oxic from nitrate-reducing (i.e., nitrogenous) water and nitrogenous from weakly sulfidic water. The sulfidic water mass in contact with the shelf sediment contained elevated iron concentrations >300 nM. At the boundary between sulfidic and nitrogenous conditions, iron concentrations dropped sharply to <20 nM coincident with a maximum in particulate iron concentration. Within the iron gradient, we found an increased expression of the key functional marker gene for nitrate reduction (narG). Part of this upregulation was related to the activity of known iron-oxidizing bacteria. Collectively, our data suggest that iron oxidation and removal is induced by nitrate-reducing microbes, either enzymatically through anaerobic iron oxidation or by providing nitrite for an abiotic reaction. Given the important role that iron plays in nitrogen fixation, photosynthesis and respiration, nitrate-dependent iron oxidation likely represents a key-link between the marine biogeochemical cycles of nitrogen, oxygen and carbon.
German Science Foundation (DFG), grant/award no. 27542298: Climate - Biogeochemistry Interactions in the Tropical Ocean
Median Latitude: -12.408604 * Median Longitude: -77.431833 * South-bound Latitude: -12.598000 * West-bound Longitude: -77.695667 * North-bound Latitude: -12.224833 * East-bound Longitude: -77.180167
Date/Time Start: 2013-01-08T23:30:00 * Date/Time End: 2013-01-29T23:55:00
Minimum DEPTH, water: 14 m * Maximum DEPTH, water: 875 m
M92_0031-1 * Latitude: -12.388333 * Longitude: -77.403667 * Date/Time: 2013-01-08T23:30:00 * Elevation: -244.3 m * Campaign: M92 * Basis: Meteor (1986) * Method/Device: Go-Flo bottles (GOFLO)
M92_0060-1 * Latitude: -12.311500 * Longitude: -77.300000 * Date/Time: 2013-01-12T00:11:00 * Elevation: -145.0 m * Campaign: M92 * Basis: Meteor (1986) * Method/Device: Go-Flo bottles (GOFLO)
M92_0072-1 * Latitude: -12.224833 * Longitude: -77.180167 * Date/Time: 2013-01-12T17:18:00 * Elevation: -73.5 m * Campaign: M92 * Basis: Meteor (1986) * Method/Device: Go-Flo bottles (GOFLO)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventScholz, Florian
2Date/Time of eventDate/TimeScholz, Florian
3Latitude of eventLatitudeScholz, Florian
4Longitude of eventLongitudeScholz, Florian
5Sample code/labelSample labelScholz, Florian
6DEPTH, waterDepth watermScholz, FlorianGeocode
7Iron, dissolvedFe dissnmol/lScholz, Florian
8Iron, particulateFe partµg/lScholz, FlorianInductively coupled plasma - mass spectrometry (ICP-MS)
9Aluminium, particulateAl partµg/lScholz, FlorianInductively coupled plasma - mass spectrometry (ICP-MS)
10Iron/Aluminium ratioFe/AlScholz, Florian
250 data points

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