Citation:

2018GL079829

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Further details:

Anderson, Robert F; Fleisher, Martin Q; Robinson, Laura F; Edwards, R Lawrence; Hoff, J A; Moran, S Bradley; Rutgers van der Loeff, Michiel M; Thomas, Alexander L; Roy-Barman, Matthieu; Francois, Roger (2012): GEOTRACES intercalibration of 230Th, 232Th, 231Pa, and prospects for 10Be. Limnology and Oceanography-Methods, 10(4), 179-213, https://doi.org/10.4319/lom.2012.10.179

Hansen, R G; Ring, E J (1983): The preparation and certification of uranium reference material. Council for Mineral Technology, Randburg, South Africa

Project(s):

Global marine biogeochemical cycles of trace elements and their isotopes (GEOTRACES)

Marine Geochemistry @ AWI (AWI_MarGeoChem)

Coverage:

Latitude: 86.996830 * Longitude: 58.615000

Date/Time Start: 2015-09-02T05:11:00 * Date/Time End: 2015-09-02T05:11:00

Minimum DEPTH, water: 50 m * Maximum DEPTH, water: 4850 m

Event(s):

PS94/068-1 * Latitude: 86.996830 * Longitude: 58.615000 * Date/Time: 2015-09-02T05:11:00 * Elevation: -4908.2 m * Location: Arctic Ocean * Campaign: (ARK-XXIX/3) * Basis: * Method/Device: (CTD-RO)

Comment:

Analysis of 230Th and 232Th were performed in clean laboratories of the Alfred-Wegener-Institute (AWI), following GEOTRACES methods (Anderson et al., 2012).

Seawater samples were spiked with 229Th and 236U to prepare the isotope dilution analyses by ICP-MS. Spikes were calibrated against the reference standard material UREM11, a material in state of radioactive equilibrium (Hansen et al., 1983].

Particles were sampled using in-situ pumps (McLane and Challenger Oceanic). 208 L to 772 L seawater were pumped through a 142 mm ᴓ, 0.45 µm pore size Supor® (polyether sulfone) filter (Anderson et al., 2012). Filters were cut aboard for subsamples under a laminar flow hood on a cutting board using tweezers and scalpels. 5/6 of the filters were used for Thorium and 231Pa (not shown in this study) analysis. A subsample (23mm ᴓ) was dried, placed onto plastic mounts, covered with Mylar and aluminum foil and directly measured by beta decay counting of 234Th (t1/2 = 24.1 days) for at least 12 h. Background measurements were performed six months later. Measurements were performed using an ICP-MS (Thermo Scientific™ ELEMENT-2™) equipped with an Apex-Q (Elemental Scientific®).

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Version comment:

2020-01-28: Thorium 232, dissolved corrected

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, water	Depth water	m	Valk, Ole		Geocode
2	Thorium-230, dissolved	230Th diss	fg/kg	Valk, Ole	ICP-MS, Thermo Scientific, Element 2
3	Thorium-230, dissolved, standard deviation	230Th diss std dev	±	Valk, Ole	ICP-MS, Thermo Scientific, Element 2
4	Thorium-232, dissolved	232Th diss	pmol/kg	Valk, Ole	ICP-MS, Thermo Scientific, Element 2
5	Thorium-232, dissolved, standard deviation	232Th diss std dev	±	Valk, Ole	ICP-MS, Thermo Scientific, Element 2

Change history:

2020-01-28T15:04:25 – Thorium 232, dissolved corrected

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

52 data points

Data

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

1 Depth water [m]	2 230Th diss [fg/kg]	3 230Th diss std dev [±]	4 232Th diss [pmol/kg]	5 232Th diss std dev [±]
50	3.30	0.170	78.66	1.30
100	4.61	0.180	59.99	0.90
200	5.78	0.180	52.09	0.64
300	6.96	0.200	52.94	0.65
500	7.37	0.200	46.35	0.51
1000	7.18	0.170	51.49	0.39
1500	9.27	0.230	31.04	0.39
2000	5.09	0.180	12.62	0.17
2600	6.47	0.180	14.74	0.15
3000	6.46	0.170	9.65	0.09
3500	7.37	0.200	9.48	0.11
4000	8.44	0.210	16.72	0.19
4850	9.55	0.220	15.30	0.17