Citation:

PANGAEA.965722

Name: Coccolith species abundances in ODP Hole 162-984C from the subpolar North Atlantic Ocean for the past 24 ka
Creator: Karl-Heinz Baumann
Published: 2024-04-15
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Assemblages; coccolith abundances; Coccolithophores; North Atlantic; ODP

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Abstract:

Coccolithophore assemblage data from sediment core 162-984C from the subpolar North Atlantic ocean spanning the past 24 ka. The assemblage data were used to assess changes in biodiversity and assemblage composition during the past 24 ka, i.e., from the Last Glacial Maximum (LGM) to the current warm period covering the last deglaciation.

Samples were analysed at 2-32 cm intervals and were prepared using a combined dilution/filtering technique as described by Andruleit (1996, doi:10.2307/1485964). Between 50 and 150 mg of dry bulk sediment was brought into suspension using demineralized water buffered with ammonia (pH ~ 8.5-9). The suspension was ultrasonicated for 15 to 30 s, split (split factor = 100) using a rotary splitter and filtered onto polycarbonate membrane filters (0.4 µm pore size) using a vacuum pump. Samples were dried at 40°C for 24 h before ~1x1 cm filter aliquots were mounted on an aluminium stub that was prepared with electroconductive, self-adhesive, carbon-based discs (PLANO Leit tabs). The mounted samples were sputtered with gold/palladium in a Polaron SC7640 Sputter Coater.

Coccolith counts (N) were made manually using a Zeiss DSM 940A scanning electron microscope at 3,000x and 5,000x magnification. Where possible, a minimum of 300 coccoliths were counted. In some samples fewer coccoliths were counted due to very low abundances in the LGM. Sample mass (m), magnification, split factor (k) and the area of the scanned transect (A) and the filter (F) are given for all samples to allow calculation of the concentration of coccoliths per gram of dry bulk sediment, which was calculated using: (F*N)/(k*A*m).

Coccolithophore taxonomy follows Young et al. (2003, doi:10.58998/jnr2297). Species not reported in the data are assumed to be absent (that is, zero abundance). Two subspecies of Calcidiscus leptoporus were distinguished: Calcidiscus leptoporus subsp. quadriperforatus and Calcidiscus leptoporus subsp. leptoporus. The ladder was further subdivided into small (< 5 µm) and larger (>= 5 µm) specimens. Furthermore, two subspecies of Coccolithus pelagicus were distinguished: Coccolithus pelagicus subsp. braarudii and Coccolithus pelagicus subsp. pelagicus. Counts of unidentified specimens are given.

The chronology of the time series presented here is the revised age model included in the PALMOD 130k marine palaeoclimate data synthesis V1.1 (Jonkers et al., 2020, doi:10.5194/essd-12-1053-2020). It is based on radiocarbon ages measured on the planktonic foraminifera G. bulloides and N. pachyderma as well as tephra layers and benthic foraminifera δ18O isotope data calibrated to regional benthic foraminifera δ18O stacks (Lisiecki and Stern, 2016, doi:10.1002/2016pa003002).

Keyword(s):

Assemblages; coccolith abundances; Coccolithophores; North Atlantic; ODP

Coverage:

Latitude: 61.425300 * Longitude: -24.082500

Date/Time Start: 1995-07-28T08:20:00 * Date/Time End: 1995-07-29T01:45:00

Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 4.45 m

Event(s):

162-984C * Latitude: 61.425300 * Longitude: -24.082500 * Date/Time Start: 1995-07-28T08:20:00 * Date/Time End: 1995-07-29T01:45:00 * Elevation: -1649.0 m * Penetration: 290.4 m * Recovery: 296 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 31 core; 290.4 m cored; 0 m drilled; 101.9 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Baumann, Karl-Heinz	IODP Depth Scale Terminology	Geocode – Mid depth
2	Sample code/label	Sample label		Baumann, Karl-Heinz	DSDP/ODP/IODP sample designation
3	AGE	Age	ka BP	Baumann, Karl-Heinz		Geocode
4	Acanthoica quattrospina	A. quattrospina	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
5	Algirosphaera robusta	A. robusta	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
6	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	< 5 µm
7	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	>= 5 µm
8	Calcidiscus leptoporus ssp. quadriperforatus	C. leptoporus ssp. quadriperforatus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
9	Calciosolenia brasiliensis	C. brasiliensis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
10	Coccolithus pelagicus ssp. pelagicus	C. pelagicus ssp. pelagicus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
11	Coccolithus pelagicus ssp. braarudii	C. pelagicus ssp. braarudii	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
12	Coronosphaera mediterranea	C. mediterranea	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
13	Emiliania huxleyi	E. huxleyi	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
14	Florisphaera profunda	F. profunda	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
15	Gladiolithus flabellatus	G. flabellatus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
16	Gephyrocapsa ericsonii	G. ericsonii	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
17	Gephyrocapsa muellerae	G. muellerae	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
18	Gephyrocapsa oceanica	G. oceanica	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
19	Hayaster perplexus	H. perplexus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
20	Helicosphaera carteri	H. carteri	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
21	Helicosphaera wallichii	H. wallichii	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
22	Oolithotus antillarum	O. antillarum	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
23	Oolithotus fragilis	O. fragilis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
24	Ophiaster hydroideus	O. hydroideus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
25	Papposphaera spp.	Papposphaera spp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
26	Pontosphaera discopora	P. discopora	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
27	Pontosphaera spp.	Pontosphaera spp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
28	Rhabdosphaera clavigera	R. clavigera	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
29	Reticulofenestra sessilis	R. sessilis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
30	Syracosphaera pulchra	S. pulchra	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
31	Syracosphaera sp.	Syracosphaera sp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
32	Umbilicosphaera foliosa	U. foliosa	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
33	Umbilicosphaera sibogae	U. sibogae	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
34	Umbilicosphaera hulburtiana	U. hulburtiana	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
35	Umbellosphaera tenuis	U. tenuis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
36	Umbellosphaera irregularis	U. irregularis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
37	Umbellosphaera sp.	Umbellosphaera sp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
38	Coccoliths indeterminata	Coccoliths indet	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
39	Sample mass	Samp m	g	Baumann, Karl-Heinz
40	Split factor	Split F		Baumann, Karl-Heinz
41	Magnification	Mag		Baumann, Karl-Heinz
42	Frame width	Frame w	mm	Baumann, Karl-Heinz
43	Transect length	Transect length	mm	Baumann, Karl-Heinz
44	Scanned area	Scanned area	mm²	Baumann, Karl-Heinz
45	Filter, area	Filter area	mm²	Baumann, Karl-Heinz
46	Acanthoica quattrospina	A. quattrospina	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
47	Algirosphaera robusta	A. robusta	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
48	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	< 5 µm
49	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	>= 5 µm
50	Calcidiscus leptoporus ssp. quadriperforatus	C. leptoporus ssp. quadriperforatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
51	Calciosolenia brasiliensis	C. brasiliensis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
52	Coccolithus pelagicus ssp. pelagicus	C. pelagicus ssp. pelagicus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
53	Coccolithus pelagicus ssp. braarudii	C. pelagicus ssp. braarudii	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
54	Coronosphaera mediterranea	C. mediterranea	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
55	Emiliania huxleyi	E. huxleyi	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
56	Florisphaera profunda	F. profunda	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
57	Gladiolithus flabellatus	G. flabellatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
58	Gephyrocapsa ericsonii	G. ericsonii	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
59	Gephyrocapsa muellerae	G. muellerae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
60	Gephyrocapsa oceanica	G. oceanica	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
61	Hayaster perplexus	H. perplexus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
62	Helicosphaera carteri	H. carteri	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
63	Helicosphaera wallichii	H. wallichii	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
64	Oolithotus antillarum	O. antillarum	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
65	Oolithotus fragilis	O. fragilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
66	Ophiaster hydroideus	O. hydroideus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
67	Papposphaera spp.	Papposphaera spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
68	Pontosphaera discopora	P. discopora	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
69	Pontosphaera spp.	Pontosphaera spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
70	Rhabdosphaera clavigera	R. clavigera	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
71	Reticulofenestra sessilis	R. sessilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
72	Syracosphaera pulchra	S. pulchra	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
73	Syracosphaera sp.	Syracosphaera sp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
74	Umbilicosphaera foliosa	U. foliosa	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
75	Umbilicosphaera sibogae	U. sibogae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
76	Umbilicosphaera hulburtiana	U. hulburtiana	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
77	Umbellosphaera tenuis	U. tenuis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
78	Umbellosphaera irregularis	U. irregularis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
79	Umbellosphaera sp.	Umbellosphaera sp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
80	Coccoliths indeterminata per unit sediment mass	Cocco indet/sed	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

4290 data points

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