Citation:

PANGAEA.926855

Name: Tropical Atlantic seawater U-series of James Cook cruise JC094
Published: 2021-01-21
License: https://creativecommons.org/licenses/by/4.0/
Keywords: beam attenuation coefficient; Pa/Th; tropical Atlantic; XRF

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Abstract:

The radiogenic isotope ratio 231Pa/230Th of seawater and ocean sediments is a potentially powerful tool for tracing oceanic processes such as the ocean circulation and marine primary productivity. However, 231Pa/230Th reflects the combined signal of multiple controls associated with scavenging and oceanic transport, limiting its use as a paleo-proxy. Given that links between seawater and sedimentary 231Pa and 230Th distributions are crucial for understanding the cycling and removal fluxes of these nuclides, we carry out analysis of 231Pa and 230Th in both seawater (dissolved phase) and modern sediment samples acquired from five depth transects across the northern tropical Atlantic open ocean during the JC094 research expedition which took place in October-November 2013. Measurements of the radiogenic isotopes were performed using a MultiCollector-Inductively Coupled Plasma-Mass Spectrometer (MC-ICP-MS). In addition, CTD beam attenuation coefficient measurements and XRF scan Fe and Ti measurements of two sediment cores collected from the region during the same research expedition are presented to aid interpretation of 231Pa and 230Th data. Here we show the U-series dataset for the seawater samples.

Keyword(s):

beam attenuation coefficient; Pa/Th; tropical Atlantic; XRF

Related to:

Ng, Hong Chin; Robinson, Laura F; Rowland, George Henry; Chen, Siyuan Sean; McManus, Jerry F (2020): Coupled analysis of seawater and sedimentary 231Pa/230Th in the tropical Atlantic. Marine Chemistry, 227, https://doi.org/10.1016/j.marchem.2020.103894

Ng, Hong Chin; Robinson, Laura F; Rowland, George Henry; Chen, Siyuan Sean; McManus, Jerry F (2021): Beam attenuation coefficient data from Carter Seamount station JC094-STN002 of the James Cook cruise JC094 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.926856

Ng, Hong Chin; Robinson, Laura F; Rowland, George Henry; Chen, Siyuan Sean; McManus, Jerry F (2021): Beam attenuation coefficient data from Knipovich seamount station JC094-STN020 of the James Cook cruise JC094 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.926857

Ng, Hong Chin; Robinson, Laura F; Rowland, George Henry; Chen, Siyuan Sean; McManus, Jerry F (2021): Beam attenuation coefficient data from Vayda ridge station JC094-STN044 of the James Cook cruise JC094 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.926859

Ng, Hong Chin; Robinson, Laura F; Rowland, George Henry; Chen, Siyuan Sean; McManus, Jerry F (2021): Beam attenuation coefficient data from Vema ridge stations JC094-STN032 and JCO94-STN039 of the James Cook cruise JC094 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.926858

Ng, Hong Chin; Robinson, Laura F; Rowland, George Henry; Chen, Siyuan Sean; McManus, Jerry F (2021): Iron and titanium content of sediment cores from Carter Seamount station JC094-STN018 of the James Cook cruise JC094 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.926860

Ng, Hong Chin; Robinson, Laura F; Rowland, George Henry; Chen, Siyuan Sean; McManus, Jerry F (2021): Iron and titanium content of sediment cores from Gramberg Seamount station JC094-STN059 of the James Cook cruise JC094 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.926862

Ng, Hong Chin; Robinson, Laura F; Rowland, George Henry; Chen, Siyuan Sean; McManus, Jerry F (2021): Tropical Atlantic sediment U-series of James Cook cruise JC094 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.926847

Rowland, George Henry; Ng, Hong Chin; Robinson, Laura F; McManus, Jerry F; Mohamed, Kais J; McGee, David (2017): Investigating the use of 232Th/230Th as a dust proxy using co-located seawater and sediment samples from the low-latitude North Atlantic. Geochimica et Cosmochimica Acta, 214, 143-156, https://doi.org/10.1016/j.gca.2017.07.033

Coverage:

Median Latitude: 10.825380 * Median Longitude: -35.566520 * South-bound Latitude: 5.705700 * West-bound Longitude: -50.991400 * North-bound Latitude: 15.464300 * East-bound Longitude: -21.632600

Date/Time Start: 2013-10-19T04:16:00 * Date/Time End: 2013-11-27T01:48:00

Minimum DEPTH, water: 605 m * Maximum DEPTH, water: 4512 m

Event(s):

JC094-STN002 * Latitude: 9.284500 * Longitude: -21.632167 * Date/Time: 2013-10-19T04:16:00 * Elevation: -4522.0 m * Campaign: (TROPICS) * Basis: * Method/Device: * Comment: CTD in and out of water (mini core attached at 04:10:00). 24 successful bottles.

JC094-STN019 * Latitude: 7.434833 * Longitude: -21.796333 * Date/Time: 2013-10-28T20:08:00 * Elevation: -3419.0 m * Campaign: (TROPICS) * Basis: * Method/Device: MegaCorer (MEGAC) * Comment: 4 sucesful megacores about 25cm - 40cm long composed of muddy sand and sandy mud.

JC094-STN020 * Latitude: 5.791667 * Longitude: -26.683167 * Date/Time: 2013-10-30T06:42:00 * Elevation: -4054.0 m * Campaign: (TROPICS) * Basis: * Method/Device: * Comment: Successful ctd, 24 niskins, no mini corer, altimeter working.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Ng, Hong Chin
2	Location	Location		Ng, Hong Chin
3	Sample ID	Sample ID		Ng, Hong Chin
4	LATITUDE	Latitude		Ng, Hong Chin		Geocode
5	LONGITUDE	Longitude		Ng, Hong Chin		Geocode
6	DEPTH, water	Depth water	m	Ng, Hong Chin		Geocode
7	Uranium-238	238U	dpm/kg	Rowland, George Henry	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
8	Uranium-238, error	238U e	±	Rowland, George Henry	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)	2 SEM
9	Thorium-232	232Th	dpm/kg	Rowland, George Henry	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
10	Thorium-232, error	232Th e	±	Rowland, George Henry	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)	2 SEM
11	Thorium-230 excess, decay-corrected	230Th xs,0	dpm/kg	Rowland, George Henry	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
12	Thorium-230 excess, decay-corrected, error	230Th xs,0 e	±	Rowland, George Henry	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)	2 SEM
13	Protactinium-231 excess, decay-corrected	230Pa xs,0	dpm/kg	Ng, Hong Chin	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
14	Protactinium-231 excess, decay-corrected, error	230Pa xs,0 e	±	Ng, Hong Chin	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)	2 SEM
15	Protactinium-231/Thorium-230 excess, decay-corrected	231Pa/230Th xs0		Ng, Hong Chin	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
16	Protactinium-231/Thorium-230 excess, decay-corrected, error	231Pa/230Th xs,0 e	±	Ng, Hong Chin	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)	2 SEM

License:

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

Size:

240 data points

Data

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

1 Event	2 Location	3 Sample ID	4 Latitude	5 Longitude	6 Depth water [m]	7 238U [dpm/kg]	8 238U e [±]	9 232Th [dpm/kg]	11 230Th xs,0 [dpm/kg]	12 230Th xs,0 e [±]	13 230Pa xs,0 [dpm/kg]	14 230Pa xs,0 e [±]	15 231Pa/230Th xs0	16 231Pa/230Th xs,0 e [±]
JC094-STN002	Carter	JC094-W0147	9.2844	-21.6326	705	2368000	11000	16.84	170	10	175	11	1.031	0.085
JC094-STN002	Carter	JC094-W0145	9.2844	-21.6326	1503	2393000	11000	20.42	335	12	336	16	1.003	0.059
JC094-STN002	Carter	JC094-W0144	9.2844	-21.6326	2002	2376000	11000	20.61	476	20	362	16	0.762	0.046
JC094-STN002	Carter	JC094-W0143	9.2844	-21.6326	2800	2378000	27000	17.69	562	17	369	16	0.656	0.035
JC094-STN019	Carter	JC094-W0303	7.4349	-21.7963	3419	2386000	23000	23.58	682	20	312	16	0.457	0.028
JC094-STN002	Carter	JC094-W0140	9.2844	-21.6326	4512	2392000	22000	18.55	673	22	266	12	0.395	0.022
JC094-STN020	Knipovich	JC094-W0441	5.7917	-26.6833	1002	2367000	21000	17.35	265	5	270	12	1.021	0.048
JC094-STN020	Knipovich	JC094-W0439	5.7917	-26.6833	2000	2392000	10000	22.30	542	13	339	15	0.626	0.032
JC094-STN020	Knipovich	JC094-W0438	5.7917	-26.6833	2799	2377000	10000	16.61	582	23	326	14	0.560	0.034
JC094-STN027	Knipovich	JC094-W0555	5.7057	-27.2738	4405	2390000	26000	16.02	592	14	240	15	0.406	0.027
JC094-STN039	Vema	JC094-W0955	10.9630	-44.4915	605	2374000	26000	15.46	162	7	143	10	0.885	0.070
JC094-STN032	Vema	JC094-W0721	10.5548	-44.5148	1009	2374000	26000	14.42	244	7	235	15	0.962	0.063
JC094-STN039	Vema	JC094-W0950	10.9630	-44.4915	2801	2386000	119000	10.35	496	24	277	14	0.559	0.036
JC094-STN044	Vayda	JC094-W1192	15.2708	-48.2597	1004	2372000	37000	7.88	139	7	228	16	1.642	0.136
JC094-STN044	Vayda	JC094-W1190	15.2708	-48.2597	1503	2386000	14000	13.81	456	10	292	13	0.639	0.035
JC094-STN044	Vayda	JC094-W1189	15.2708	-48.2597	2001	2373000	15000	4.33	177	9	122	11	0.690	0.072
JC094-STN044	Vayda	JC094-W1188	15.2708	-48.2597	2800	2376000	24000	3.46	153	6	188	11	1.227	0.094
JC094-STN044	Vayda	JC094-W1187	15.2708	-48.2597	3798	2368000	29000	3.77	161	7	141	10	0.876	0.075
JC094-STN044	Vayda	JC094-W1186	15.2708	-48.2597	4168	2356000	41000	7.21	303	13	174	10	0.575	0.040
JC094-STN061	Gramberg	JC094-W1377	15.4643	-50.9914	2714	2396000	32000	3.95	186	11	151	11	0.813	0.076