Citation:

PANGAEA.936029

Name: Radium isotopes and 228Th in surface water samples collected on POLARSTERN expedition PS100
Published: 2021-09-21
License: https://creativecommons.org/licenses/by/4.0/
Keywords: GEOTRACES; Radium; Thorium

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Abstract:

Radium isotopes are produced by decay of an isotope of thorium, a highly particle reactive element. Radium is relatively soluble in seawater such that once a thorium isotope in suspended or bottom sediments decays, a fraction of the produced radium isotope may be released to solution. 228Ra is strongly enriched in shelf waters and in the Transpolar Drift (TPD) and its half-life (5.8 years) is well suited to study the fate of this shelf-derived water in the central Arctic. The 228Th/228Ra ratio in the subsurface water column can be used to trace particle fluxes. In previous studies up to PS94 (2015) we had identified the strong and increasing 228Ra signal in the Transpolar Drift. During PS100 we studied the distribution of 228Ra in Fram Strait to investigate how this 228Ra signal in the TPD is changed by dilution and decay on its way to the East Greenland Current. Water from the ship's seawater intake was filtered and passed over MnO2-coated cartridges to absorb the Ra and Th. On board, short-lived Radium isotopes and 228Th were analysed using RaDeCC counting. In the lab, the cartridges were leached in refluxing HCl and long-lived Radium isotopes were measured by gamma spectroscopy.

Keyword(s):

GEOTRACES; Radium; Thorium

Supplement to:

Krisch, Stephan; Hopwood, Mark James; Roig, Stéphane; Gerringa, Loes J A; Middag, Rob; Rutgers van der Loeff, Michiel M; Petrova, Mariia V; Lodeiro, Pablo Fernandez; Colombo, Manuel; Cullen, Jay T; Jackson, Sarah L; Heimbürger-Boavida, Lars-Eric; Achterberg, Eric Pieter (2022): Arctic – Atlantic exchange of the dissolved micronutrients Iron, Manganese, Cobalt, Nickel, Copper and Zinc with a focus on Fram Strait. Global Biogeochemical Cycles, https://doi.org/10.1029/2021GB007191

Related to:

Krisch, Stephan; Hopwood, Mark James; Schaffer, Janin; Al Hashem,, A; Höfer, Juan; Rutgers van der Loeff, Michiel M; Conway, Tim M; Summers, Brent A; Lodeiro, Pablo Fernandez; Ardiningsih, Indah; Steffens, Tim; Achterberg, Eric Pieter (2021): The 79°N Glacier cavity modulates subglacial iron export to the NE Greenland Shelf. Nature Communications, 12(1), 3030, https://doi.org/10.1038/s41467-021-23093-0

Project(s):

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

Coverage:

Median Latitude: 79.287886 * Median Longitude: -7.293314 * South-bound Latitude: 76.302000 * West-bound Longitude: -19.517000 * North-bound Latitude: 80.730000 * East-bound Longitude: 8.324000

Date/Time Start: 2016-07-23T01:09:00 * Date/Time End: 2016-09-01T01:18:00

Minimum DEPTH, water: 10 m * Maximum DEPTH, water: 10 m

Event(s):

PS100/015-3 * Latitude: 78.999670 * Longitude: 8.330000 * Date/Time: 2016-07-22T22:01:00 * Elevation: -786.8 m * Location: North Greenland Sea * Campaign: (ARK-XXX/2, GN05) * Basis: * Method/Device: In situ pump (ISP)

PS100/028-3 * Latitude: 78.986500 * Longitude: 6.994330 * Date/Time: 2016-07-24T22:19:00 * Elevation: -1198.4 m * Location: North Greenland Sea * Campaign: (ARK-XXX/2, GN05) * Basis: * Method/Device: In situ pump (ISP)

PS100/037-3 * Latitude: 78.833500 * Longitude: 3.502000 * Date/Time: 2016-07-26T20:18:00 * Elevation: -2300.1 m * Location: North Greenland Sea * Campaign: (ARK-XXX/2, GN05) * Basis: * Method/Device: In situ pump (ISP)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Rutgers van der Loeff, Michiel M
2	Station label	Station		Rutgers van der Loeff, Michiel M
3	DATE/TIME	Date/Time		Rutgers van der Loeff, Michiel M		Geocode
4	LATITUDE	Latitude		Rutgers van der Loeff, Michiel M		Geocode
5	LONGITUDE	Longitude		Rutgers van der Loeff, Michiel M		Geocode
6	Depth, bathymetric	Bathy depth	m	Rutgers van der Loeff, Michiel M
7	DEPTH, water	Depth water	m	Rutgers van der Loeff, Michiel M		Geocode
8	Thorium-228	228Th	dpm/m³	Rutgers van der Loeff, Michiel M	RaDeCC	dissolved
9	Thorium-228, standard deviation	228Th std dev	±	Rutgers van der Loeff, Michiel M	RaDeCC
10	Radium-224	224Ra	dpm/m³	Rutgers van der Loeff, Michiel M	RaDeCC	dissolved
11	Radium-224, standard deviation	224Ra std dev	±	Rutgers van der Loeff, Michiel M	RaDeCC
12	Radium-226	226Ra	dpm/m³	Rutgers van der Loeff, Michiel M	Gamma spectroscopy
13	Radium-226, standard deviation	226Ra std dev	±	Rutgers van der Loeff, Michiel M	Gamma spectroscopy
14	Radium-228	228Ra	dpm/m³	Rutgers van der Loeff, Michiel M	Gamma spectroscopy
15	Radium-228, standard deviation	228Ra std dev	±	Rutgers van der Loeff, Michiel M	Gamma spectroscopy
16	Radium-228/Radium-226 activity ratio	(228Ra/226Ra)		Rutgers van der Loeff, Michiel M
17	Radium-228/Radium-226 activity ratio, standard deviation	(228Ra/226Ra) std dev	±	Rutgers van der Loeff, Michiel M

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

420 data points

Data

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

1 Event	2 Station	3 Date/Time	4 Latitude	5 Longitude	6 Bathy depth [m]	7 Depth water [m]	8 228Th [dpm/m³]	9 228Th std dev [±]	10 224Ra [dpm/m³]	11 224Ra std dev [±]	12 226Ra [dpm/m³]	13 226Ra std dev [±]	14 228Ra [dpm/m³]	15 228Ra std dev [±]	16 (228Ra/226Ra)	17 (228Ra/226Ra) std dev [±]
PS100/015-3	15	2016-07-23T01:09	79.000	8.324	791.4	10	2.74	0.44	10.22	0.81	94.13	4.70	17.14	1.79	0.182	0.019
PS100/028-3	28	2016-07-25T01:35	78.988	6.993	1198.4	10	2.26	0.30	8.31	0.63	77.03	2.84	15.79	0.91	0.205	0.011
PS100/037-3	37	2016-07-26T23:32	78.835	3.504	2300.3	10	2.71	0.29	10.07	0.63	82.38	2.52	17.86	0.88	0.217	0.010
PS100/044-3	44	2016-07-28T14:48	78.830	1.088	2474.4	10	6.87	0.85	15.60	1.33	76.67	2.38	12.74	0.92	0.166	0.012
PS100/052-3	52	2016-07-31T05:10	80.730	0.099	3189.2	10	16.57	0.54	29.05	1.02	69.88	2.06	17.99	0.84	0.257	0.012
PS100/54	54	2016-07-31T23:39	80.377	-1.511	4082.2	10	21.73	0.93	46.33	1.89	84.09	2.62	56.93	2.55	0.677	0.030
PS100/55	55	2016-08-01T07:49	80.370	-2.847	3397.9	10	31.52	0.77	53.14	1.59	81.82	3.46	52.06	2.10	0.636	0.031
PS100/56	56	2016-08-01T07:49	80.370	-4.000	2561.7	10	24.37	0.62	53.73	1.48	80.17	2.38	61.33	2.37	0.765	0.028
PS100/58	58	2016-08-02T03:10	80.274	-4.988	1487.4	10	34.24	1.03	75.38	2.19	84.57	3.60	53.88	2.31	0.637	0.033
PS100/60	60	2016-08-02T10:00	80.247	-6.017	370.2	10	34.21	1.24	59.87	2.41	80.92	2.55	57.20	2.48	0.707	0.030
PS100/73	73	2016-08-06T05:10	80.100	-8.500	282.0	10	21.91	0.62	43.40	1.27	84.45	2.52	60.74	2.39	0.719	0.027
PS100/75	75	2016-08-03T22:16	80.250	-9.016	302.6	10	20.13	1.43	59.66	3.38	89.30	2.94	61.21	2.98	0.685	0.033
PS100/76	76	2016-08-04T00:41	80.341	-10.006	324.6	10	20.18	0.83	44.00	1.87	85.31	2.57	51.76	2.08	0.607	0.023
PS100/78	78	2016-08-04T06:06	80.431	-12.005	268.8	10	13.77	0.55	29.00	1.45	79.00	2.54	49.10	2.36	0.621	0.030
PS100/79	79	2016-08-04T16:06	80.449	-12.836	279.5	10	24.30	1.04	43.10	2.42	89.57	3.03	44.48	2.80	0.497	0.032
PS100/80	80	2016-08-04T18:27	80.600	-13.602	135.2	10	13.72	1.60	41.15	3.55	83.38	3.17	59.82	3.57	0.718	0.043
PS100/82	82	2016-08-04T23:45	80.448	-13.190	290.9	10	22.23	1.15	43.54	2.46	90.46	3.14	47.71	3.02	0.527	0.034
PS100/90	90	2016-08-05T22:23	78.831	-12.001	200.6	10	18.10	1.13	40.67	2.48	86.89	3.18	47.87	2.98	0.551	0.034
PS100/94	94	2016-08-06T10:47	78.678	-7.943	172.1	10	15.43	1.90	65.12	7.40	97.05	10.01	69.11	7.98	0.712	0.047
PS100/96	96	2016-08-06T18:34	78.765	-5.985	324.6	10	26.10	2.95	66.27	8.12	88.41	9.05	45.61	5.30	0.516	0.034
PS100/99	99	2016-08-07T10:00	78.833	-3.750	1413.0	10	11.71	1.52	29.61	4.11	80.59	8.26	25.26	3.35	0.313	0.029
PS100/101-3	101	2016-08-07T23:06	78.700	-3.639	2042.0	10	10.61	1.16	30.52	3.50	73.61	7.47	17.68	2.12	0.240	0.017
PS100/103-4	103	2016-08-09T01:36	78.796	-2.499	2606.0	10	7.27	0.78	18.61	2.25	73.49	7.41	13.17	1.42	0.179	0.008
PS100/120	120	2016-08-11T13:39	76.302	-6.312	2337.0	10	6.39	1.15	21.98	3.49	87.19	9.00	18.93	3.17	0.217	0.030
PS100/135	135	2016-08-13T01:00	76.802	-8.615	350.9	10	14.39	0.93	38.55	1.75	72.37	2.47	41.02	2.52	0.567	0.035
PS100/143	143	2016-08-13T19:17	77.088	-10.237	458.2	10	22.82	0.91	43.82	1.91	69.67	2.08	43.11	1.72	0.619	0.024
PS100/165-3	165	2016-08-16T15:22	77.865	-14.768	451.0	10	12.37	0.87	38.08	2.64	85.07	3.42	49.69	3.81	0.584	0.046
PS100/179	179	2016-08-18T06:11	78.180	-15.727	360.8	10	10.57	0.35	17.66	0.90	44.07	1.40	23.65	1.12	0.537	0.025
PS100/189-3	189	2016-08-19T16:58	79.198	-17.092	397.0	10	14.78	0.87	38.20	1.57	76.42	2.32	40.99	1.86	0.536	0.024
PS100/241-3	241	2016-08-23T21:31	79.568	-19.517	468.9	10	17.34	0.60	38.62	4.09	111.91	11.45	75.45	8.52	0.674	0.040
PS100/262	262	2016-08-27T12:24	79.638	-16.640	246.9	10	4.45	0.22	10.46	0.54	25.90	0.86	14.26	0.81	0.551	0.031
PS100/274	274	2016-08-29T01:26	80.148	-17.382	180.6	10	7.96	0.40	17.55	1.36	55.95	1.85	39.09	2.02	0.699	0.036
PS100/280	280	2016-08-30T15:56	79.580	-4.785	1320.0	10	11.59	0.34	24.42	0.97	40.31	1.25	29.88	1.32	0.741	0.032
PS100/285-2	285	2016-09-01T01:18	78.732	-4.932	894.4	10	29.26	0.70	52.74	1.45	70.13	2.27	53.95	2.54	0.769	0.036
PS100/288	288	2016-09-01T01:18	78.732	-4.932	894.4	10	11.22	0.35	23.11	1.01	44.78	1.41	23.09	1.12	0.516	0.024