Citation:

PANGAEA.965722

Name: Coccolith species abundances in sediment core GeoB5546-2 off NW Africa for the past 45 ka
Creator: Karl-Heinz Baumann
Published: 2024-04-15
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Assemblages; coccolith abundances; Coccolithophores; North Atlantic

Always quote citation above when using data! You can download the citation in several formats below.

RIS Citation BibTeX Citation Text Citation Facebook TwitterShow Map Google Earth

Abstract:

Coccolithophore assemblage data from sediment core GeoB5546-2 off the coast of NW Africa spanning the past 45 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 to the current warm period covering the last deglaciation.

Samples were analysed at 4-10 cm intervals and were prepared using a combined dilution/filtering technique as described by Andruleit (1996, doi:10.2307/1485964). Between 50 and 100 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 low abundances. 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. Counts of unidentified and reworked specimens are given. In samples greater or equal to 4.53 m depth, Umbilicosphaera sibogae is included in the Umbilicosphaera foliosa column.

The chronology of the time series presented here was revised using the same approach as 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 planktonic foraminifera δ18O isotope data (Holzwarth et al., 2010, doi:10.1016/j.palaeo.2010.03.013) calibrated to the NGRIP ice core δ18O record.

Keyword(s):

Assemblages; coccolith abundances; Coccolithophores; North Atlantic

Coverage:

Latitude: 27.536700 * Longitude: -13.736700

Date/Time Start: 1998-10-15T11:01:00 * Date/Time End: 1998-10-15T11:01:00

Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 8.33 m

Event(s):

GeoB5546-2 * Latitude: 27.536700 * Longitude: -13.736700 * Date/Time: 1998-10-15T11:01:00 * Elevation: -1172.0 m * Recovery: 8.51 m * Campaign: * Basis: * Method/Device: Piston corer (BGR type) (KL) * Comment: core recovery 8.51 m

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Baumann, Karl-Heinz		Geocode
2	AGE	Age	ka BP	Baumann, Karl-Heinz		Geocode
3	Algirosphaera robusta	A. robusta	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
4	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
5	Calcidiscus leptoporus ssp. quadriperforatus	C. leptoporus ssp. quadriperforatus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
6	Coccolithus pelagicus	C. pelagicus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
7	Emiliania huxleyi	E. huxleyi	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
8	Florisphaera profunda	F. profunda	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
9	Gephyrocapsa ericsonii	G. ericsonii	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
10	Gephyrocapsa muellerae	G. muellerae	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
11	Gephyrocapsa oceanica	G. oceanica	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
12	Gladiolithus flabellatus	G. flabellatus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
13	Helicosphaera carteri	H. carteri	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
14	Oolithotus fragilis	O. fragilis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
15	Reticulofenestra sessilis	R. sessilis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
16	Rhabdosphaera clavigera	R. clavigera	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
17	Syracosphaera pulchra	S. pulchra	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
18	Syracosphaera sp.	Syracosphaera sp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
19	Umbilicosphaera foliosa	U. foliosa	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
20	Umbilicosphaera sibogae	U. sibogae	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	In samples greater or equal to 4.53 m depth, U. sibogae is included in the U. foliosa column.
21	Umbilicosphaera hulburtiana	U. hulburtiana	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
22	Umbellosphaera tenuis	U. tenuis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
23	Umbellosphaera irregularis	U. irregularis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
24	Coccoliths indeterminata	Coccoliths indet	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
25	Coccoliths, reworked	Cocco rew	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
26	Sample mass	Samp m	g	Baumann, Karl-Heinz
27	Split factor	Split F		Baumann, Karl-Heinz
28	Magnification	Mag		Baumann, Karl-Heinz
29	Frame width	Frame w	mm	Baumann, Karl-Heinz
30	Transect length	Transect length	mm	Baumann, Karl-Heinz
31	Scanned area	Scanned area	mm²	Baumann, Karl-Heinz
32	Filter, area	Filter area	mm²	Baumann, Karl-Heinz
33	Algirosphaera robusta	A. robusta	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
34	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
35	Calcidiscus leptoporus ssp. quadriperforatus	C. leptoporus ssp. quadriperforatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
36	Coccolithus pelagicus	C. pelagicus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
37	Emiliania huxleyi	E. huxleyi	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
38	Florisphaera profunda	F. profunda	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
39	Gephyrocapsa ericsonii	G. ericsonii	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
40	Gephyrocapsa muellerae	G. muellerae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
41	Gephyrocapsa oceanica	G. oceanica	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
42	Gladiolithus flabellatus	G. flabellatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
43	Helicosphaera carteri	H. carteri	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
44	Oolithotus fragilis	O. fragilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
45	Reticulofenestra sessilis	R. sessilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
46	Rhabdosphaera clavigera	R. clavigera	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
47	Syracosphaera pulchra	S. pulchra	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
48	Syracosphaera sp.	Syracosphaera sp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
49	Umbilicosphaera foliosa	U. foliosa	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
50	Umbilicosphaera sibogae	U. sibogae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	In samples greater or equal to 4.53 m depth, U. sibogae is included in the U. foliosa column.
51	Umbilicosphaera hulburtiana	U. hulburtiana	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
52	Umbellosphaera tenuis	U. tenuis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
53	Umbellosphaera irregularis	U. irregularis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
54	Coccoliths indeterminata per unit sediment mass	Cocco indet/sed	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
55	Coccoliths, reworked per unit sediment mass	Cocco rew/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:

8533 data points

Download Data

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

View dataset as HTML (shows only first 2000 rows)