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: 84.398670 * Longitude: 30.715170

Date/Time Start: 2015-08-26T09:05:00 * Date/Time End: 2015-08-26T09:05:00

Minimum DEPTH, water: 50 m * Maximum DEPTH, water: 3965 m

Event(s):

PS94/050-1 * Latitude: 84.398670 * Longitude: 30.715170 * Date/Time: 2015-08-26T09:05:00 * Elevation: -4055.7 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
6	Thorium-230, particulate	230Th part	fg/kg	Valk, Ole	ICP-MS, Thermo Scientific, Element 2
7	Thorium-230, particulate, standard deviation	230Th part std dev	±	Valk, Ole	ICP-MS, Thermo Scientific, Element 2
8	Thorium-230	230Th	fg/kg	Valk, Ole	ICP-MS, Thermo Scientific, Element 2	Total
9	Thorium-230, standard deviation	230Th std dev	±	Valk, Ole	ICP-MS, Thermo Scientific, Element 2	Total
10	Thorium-232	232Th	pmol/kg	Valk, Ole	ICP-MS, Thermo Scientific, Element 2	Total
11	Thorium-232, standard deviation	232Th std dev	±	Valk, Ole	ICP-MS, Thermo Scientific, Element 2	Total
12	Thorium-234, fraction of particulate	234Th frac part	%	Valk, Ole	ICP-MS, Thermo Scientific, Element 2

Change history:

2020-01-29T10:14:55 – Thorium 232, dissolved corrected

License:

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

Size:

117 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 [±]	6 230Th part [fg/kg]	7 230Th part std dev [±]	8 230Th [fg/kg]	9 230Th std dev [±]	10 232Th [pmol/kg]	11 232Th std dev [±]	12 234Th frac part [%]
50	3.30	0.17	40.38	0.71	0.28	0.26	3.58	0.43	0.202	0.003
100	3.40	0.18	47.63	0.92	0.51	0.28	3.91	0.46	0.257	0.004
300	1.84	0.14	35.57	0.43	0.54	0.28	2.38	0.42	0.162	0.002
500	5.42	0.17	59.73	0.59	0.57	0.26	5.99	0.42	0.370	0.004	3.14
750	6.34	0.18	56.14	0.56
1000	7.92	0.19	40.02	0.40
1500	10.67	0.19	35.04	0.27	1.62	0.26	12.29	0.44	0.255	0.002	1.49
2000	14.45	0.35	38.93	0.63	3.07	0.29	17.52	0.48	0.319	0.005	2.65
2500	4.62	0.16	11.64	0.12	4.20	0.29	8.82	0.49	0.189	0.002	1.18
2750					5.40	0.35					8.48
3000	4.95	0.18	14.98	0.19	5.22	0.32	10.17	0.70	0.164	0.002	7.32
3250					6.60	0.34					9.86
3500	6.35	0.19	11.18	0.13	5.99	0.74	12.34	0.48	0.148	0.009	5.97
3965					5.36	0.36	13.22	0.52	0.188	0.003	3.57