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Kleint, Charlotte; Hawkes, Jeffrey A; Sander, Sylvia G; Koschinsky, Andrea (2016): Geochemical characterization and the voltammetric investigation of hydrothermal Iron speciation of samples gained during SONNE cruise SO229. PANGAEA, https://doi.org/10.1594/PANGAEA.867265, Supplement to: Kleint, C et al. (2016): Voltammetric investigation of hydrothermal iron speciation. Frontiers in Marine Science, 3, 11 pp, https://doi.org/10.3389/fmars.2016.00075

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Abstract:
Hydrothermal vent fluids are highly enriched in iron (Fe) compared to ambient seawater, and organic ligands may play a role in facilitating the transport of some hydrothermal Fe into the open ocean. This is important since Fe is a limiting micronutrient for primary production in large parts of the world's surface ocean. We have investigated the concentration and speciation of Fe in several vent fluid and plume samples from the Nifonea vent field, Coriolis Troughs, New Hebrides Island Arc, South Pacific Ocean using competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-AdCSV) with salicylaldoxime (SA) as the artificial ligand. Our results for total dissolved Fe (dFe) in the buoyant hydrothermal plume samples showed concentrations up to 3.86 µM dFe with only a small fraction between 1.1 and 11.8% being chemically labile. Iron binding ligand concentrations ([L]) were found in µM level with strong conditional stability constants up to logKFeL,Fe3+ of 22.9. Within the non-buoyant hydrothermal plume above the Nifonea vent field, up to 84.7% of the available Fe is chemically labile and [L] concentrations up to 97 nM were measured. [L] was consistently in excess of Felab, indicating that all available Fe is being complexed, which in combination with high Felab values in the non-buoyant plume, signifies that a high fraction of hydrothermal dFe is potentially being transported away from the plume into the surrounding waters, contributing to the global oceanic Fe budget.
Coverage:
Median Latitude: -17.831499 * Median Longitude: 169.278667 * South-bound Latitude: -18.130670 * West-bound Longitude: 168.402830 * North-bound Latitude: -16.688830 * East-bound Longitude: 169.519170
Date/Time Start: 2013-07-09T22:02:00 * Date/Time End: 2013-07-20T07:49:00
Minimum DEPTH, water: 400 m * Maximum DEPTH, water: 1873 m
Event(s):
SO229-19-1  * Latitude Start: -16.689500 * Longitude Start: 168.402830 * Latitude End: -16.688830 * Longitude End: 168.404670 * Date/Time Start: 2013-07-09T22:02:00 * Date/Time End: 2013-07-10T05:12:00 * Elevation Start: -339.8 m * Elevation End: -334.0 m * Location: Coral Sea * Campaign: SO229 (VANUATU) * Basis: Sonne * Method/Device: Remote operated vehicle (ROV)
SO229-27-1  * Latitude Start: -18.128330 * Longitude Start: 169.512000 * Latitude End: -18.130670 * Longitude End: 169.518670 * Date/Time Start: 2013-07-11T22:32:00 * Date/Time End: 2013-07-12T06:08:00 * Elevation Start: -1878.0 m * Elevation End: -1875.0 m * Location: Coral Sea * Campaign: SO229 (VANUATU) * Basis: Sonne * Method/Device: Remote operated vehicle (ROV)
SO229-30-1  * Latitude: -18.129330 * Longitude: 169.517170 * Date/Time: 2013-07-12T13:24:00 * Elevation: -1872.5 m * Location: Coral Sea * Campaign: SO229 (VANUATU) * Basis: Sonne * Method/Device: CTD/Rosette (CTD-RO) * Comment: rope length max: 1810m
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
Event labelEventKleint, Charlotte
Sample IDSample IDKleint, Charlotte
Sample typeSamp typeKleint, Charlotte
Device typeDeviceKleint, CharlotteSampling device
Date/Time of eventDate/TimeKleint, Charlotte
Latitude of eventLatitudeKleint, Charlotte
Longitude of eventLongitudeKleint, Charlotte
Elevation of eventElevationmKleint, Charlotte
DEPTH, waterDepth watermKleint, CharlotteGeocode
10 Hydrogen sulfideH2Sµmol/lKleint, Charlotte
11 pHpHKleint, Charlotte
12 Oxidation reduction (RedOx) potentialEhmVKleint, Charlotte
13 Iron, dissolvedFe dissnmol/lKleint, Charlotte
14 Manganese, dissolvedMn dissnmol/lKleint, Charlotte
15 Iron-binding ligand, dissolvedFeL dissnmol/lKleint, Charlotteusing dissolved iron
16 Standard deviationStd dev±Kleint, Charlotteusing dissolved iron
17 Iron-binding strengthLogK FeL,Fe3+Kleint, Charlotte
18 Standard deviationStd dev±Kleint, Charlotte
19 Iron-binding ligand, dissolvedFeL dissnmol/lKleint, Charlotteusing chemically labile iron
20 Standard deviationStd dev±Kleint, Charlotteusing chemically labile iron
21 Iron-binding strengthLogK FeL,Fe3+Kleint, Charlotte
22 Standard deviationStd dev±Kleint, Charlotte
23 Iron, chemically labileFe labnmol/lKleint, Charlotte
24 RatioRatio%Kleint, CharlotteProportional chemically labile iron
25 Iron-binding ligand, excessFeL xsnmol/lKleint, Charlotte
26 RatioRatio%Kleint, CharlotteProportional excess of iron-binding ligand
Size:
197 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Event

Sample ID

Samp type

Device
(Sampling device)

Date/Time

Latitude

Longitude

Elevation [m]

Depth water [m]
10 
H2S [µmol/l]
11 
pH
12 
Eh [mV]
13 
Fe diss [nmol/l]
14 
Mn diss [nmol/l]
15 
FeL diss [nmol/l]
(using dissolved iron)
16 
Std dev [±]
(using dissolved iron)
17 
LogK FeL,Fe3+
18 
Std dev [±]
19 
FeL diss [nmol/l]
(using chemically labile iron)
20 
Std dev [±]
(using chemically labile iron)
21 
LogK FeL,Fe3+
22 
Std dev [±]
23 
Fe lab [nmol/l]
24 
Ratio [%]
(Proportional chemically labil...)
25 
FeL xs [nmol/l]
26 
Ratio [%]
(Proportional excess of iron-b...)
SO229-30-1 30 CTD 1500non-buoyant PlumeCTD2013-07-12T13:24-18.1293169.5172-187215001013221.40.213.1132.43.4726.6
SO229-30-130 CTD 1550non-buoyant PlumeCTD2013-07-12T13:24-18.1293169.5172-187215502836521.60.376.8124.99.2425.7
SO229-30-130 CTD 1600non-buoyant PlumeCTD2013-07-12T13:24-18.1293169.5172-1872160014
SO229-30-130 CTD 1650non-buoyant PlumeCTD2013-07-12T13:24-18.1293169.5172-187216503097819.70.0625.5084.767.3069.4
SO229-30-130 CTD 1700non-buoyant PlumeCTD2013-07-12T13:24-18.1293169.5172-18721700105.9359.2
SO229-56-1 56 CTD 1600BG water sampleCTD2013-07-18T12:27-18.0333169.3663-2839160070.1413120.80.520.7410.55.7143.9
SO229-19-1 19 ROV 06Diffuse vent, vent outletKIPS2013-07-09T22:02-16.6895168.4028-340<4004602.605501022.90.090.110.0521.91.485.001.191.0016.5
SO229-27-1 27 ROV 11Clear Smoker, buoyant plumeNiskin2013-07-11T22:32-18.1283169.5120-18781860207.2-2338200.2010803022.20.070.420.1821.00.4232.004.0260.0024.1
SO229-27-127 ROV 14Black smoker, vent outletKIPS2013-07-11T22:32-18.1283169.5120-1878186062003.3-267379000229.00
SO229-27-127 ROV 15Black smoker, buoyant plumeNiskin2013-07-11T22:32-18.1283169.5120-187818607.4-16116800.8020809021.90.111.541.3720.10.65143.008.5400.0019.2
SO229-27-127 ROV 16Black smoker, buoyant plumeNiskin2013-07-11T22:32-18.1283169.5120-187818607.3-738601.7038904022.10.063.031.8219.70.39457.0011.830.000.8
SO229-60-1 60 ROV 01Clear Smoker, vent outletKIPS2013-07-19T00:33-18.1287169.5182-1881187378004.7-21467000164.00
SO229-60-160 ROV 02Clear Smoker, buoyant plumeNiskin2013-07-19T00:33-18.1287169.5182-188118732006.4-2588601.709804022.10.130.230.1021.00.6361.007.1116.0011.8
SO229-60-160 ROV 07Black Smoker, buoyant plumeNiskin2013-07-19T00:33-18.1287169.5182-188118731006.9-2865402.405801022.30.060.100.0520.80.6233.006.041.007.1
SO229-66-1 66 ROV 05Black Smoker, buoyant plumeNiskin2013-07-19T22:02-18.1285169.5153-187518623006.011100060.00