Citation:

PANGAEA.773254

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Abstract:

Material and data were collected at 41 sites in the subpolar North Atlantic Ocean between Scotland and Newfoundland, during the RRS CharlesDarwin CD159 cruise in July 2004 (McCave, 2005). Sites were selected to reflect the major inputs of water that becomes the North Atlantic Deep Water (NADW); the Iceland-Scotland Overflow Water (ISOW), the Denmark Strait Overflow Water (DSOW) and the Labrador Sea Water (LSW). Areas cored were the south Iceland Rise, SE Greenland slope/rise and Eirik Drift, and the Labrador margin. A total of 29 box cores, 19 piston cores, 6 kasten cores, 9 short gravity cores and 20 CTD casts as well as 28 surface water samples were collected during the cruise. Here we present sediment core-top sample ages. The cores were sampled at 1 or 0.5 cm intervals and we used the top 1 or 2 cm, depending on availability of foraminifera in the samples. Sediment samples were disaggregated on an end-over-end wheel, wet sieved at >63 um, and dry sieved to 63-150 and >150 um. Accelerator Mass Spectrometer (AMS) radiocarbon dating was done for each core top based on between 900-1600 monospecific planktonic foraminifera (Globigerina bulloides or Neogloboquadrina pachyderma (sinistral)). All dates were of modern or late Holocene age except site RAPID-08-5B (9806 ± 38 uncorrected 14C years BP) and site RAPID-14-10B (11543 ± 40 uncorrected 14C years BP). The >150 um fraction was split until approximately 300 foraminifera remained and counted for number of lithic grains, benthic foraminifera, planktonic foraminifera and foraminifera fragments. In all but the shallowest sample (Greenland rise, 761m water depth) benthic foraminifera constituted less than 2% of the total >150 um fraction of the sample.

Related to:

McCave, I Nick (2005): Cruise Report, RRS Charles Darwin Cruise 159, 1st-30th July 2004, Fairlie, Scotland to St. John's, Newfoundland. For the RAPID Climate Change Research Programme of NERC under grant NER/T/S/2002/00436. Dept. of Earth Sciences, Cambridge, U.K., 47 pp, https://www.bodc.ac.uk/resources/inventories/cruise_inventory/report/6755/

Coverage:

Median Latitude: 59.137486 * Median Longitude: -32.509100 * South-bound Latitude: 50.710833 * West-bound Longitude: -52.952000 * North-bound Latitude: 63.139833 * East-bound Longitude: -12.162167

Minimum DEPTH, sediment/rock: 0.0000 m * Maximum DEPTH, sediment/rock: 0.0100 m

Event(s):

RAPiD-01-1B * Latitude: 57.485833 * Longitude: -12.237167 * Elevation: -1805.0 m * Location: Eastern North Atlantic * Campaign: * Basis: Charles Darwin * Method/Device: Box corer (BC)

RAPiD-03-1C * Latitude: 59.962667 * Longitude: -12.162167 * Elevation: -1206.0 m * Location: Eastern North Atlantic * Campaign: * Basis: Charles Darwin * Method/Device: (CTD-GC)

RAPiD-04-2C * Latitude: 61.743333 * Longitude: -15.405167 * Elevation: -2284.0 m * Location: South of Iceland * Campaign: * Basis: Charles Darwin * Method/Device: (CTD-GC)

Comment:

1. 14C results have been normalised to d13C [per mil PDB] -25 using the d13C values

2. Estimated d13C value - insufficient sample material for an independent d13C measurement

3. Absolute % Modern involves a mathematical adjustment to account for ongoing radioactive decay of the international reference standard (oxalic acid) since AD 1950. (Stuiver and Polach, Radiocarbon vol.19 No.3, pp.355-363). This method of reporting may be used for modelling 14C and/or for 14C results which are greater than 100% modern 14C.

4. Sample RAPiD-27-15B, SUERC-16529, 0-1cm contained 300 µg C and was too small for routine analysis. The sample was prepared to graphite using a dedicated vacuum line" for small samples and analysed on the 5MVAMS at low current. The 13C/12C ratio for this sample was measured on the SUERC AMS during 14C determination and used to model the d13C value by comparison to the Craig (1957) 13C/12C value for PDB. This value is shown in brackets and was considered the most appropriate to normalise 14C data to d13C [per mil VPDB] = -25, but is not necessarily representative of the d13C in the original sample material. The sample was too small for acid etching (usually carried out for shells to remove the outer shell surface) prior to hydrolysis to CO2.

5. Samples RAPiD-08-5B and RAPiD-14-10B: These two old ages come from sites under the core of the deep western Boundary current south of Iceland and have a winnowed surface: 5B was only a surface scrape from a hard bottom, and 10B was 'gravelly' in part.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Method/Device of event	Method/Device
3	Sample comment	Sample comment		McCave, I Nick
4	DEPTH, sediment/rock	Depth sed	m			Geocode
5	Depth, top/min	Depth top	m	McCave, I Nick
6	Depth, bottom/max	Depth bot	m	McCave, I Nick
7	Size fraction	Size fraction		McCave, I Nick
8	Location of event	Location
9	Latitude of event	Latitude
10	Longitude of event	Longitude
11	Elevation of event	Elevation	m
12	Age, dated material	Dated material		McCave, I Nick
13	Environment	Environment		McCave, I Nick
14	Sample code/label	Sample label		McCave, I Nick		Scottish Universities Environmental Research Centre number
15	Enrichment	Enrichm	%	McCave, I Nick		of 14C in % of modern
16	Standard deviation	Std dev	±	McCave, I Nick		1 sigma
17	Absolute	Abs	%	McCave, I Nick		of modern
18	Standard deviation	Std dev	±	McCave, I Nick		1 sigma
19	Age, dated	Age dated	ka	McCave, I Nick	Age, 14C AMS
20	Age, dated standard deviation	Age dated std dev	±	McCave, I Nick		1 sigma
21	δ13C	δ13C	‰ PDB	McCave, I Nick
22	Method comment	Method comm		McCave, I Nick		Estimated d13C value - insufficient sample material for an independent d13C measurement

License:

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

Size:

501 data points

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