Citation:

PANGAEA.965722

Name: Coccolith species abundances in sediment core M35003-4 from the western subtropical North Atlantic Ocean for the past 55 ka
Creator: Karl-Heinz Baumann
Published: 2024-04-15
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Assemblages; coccolith abundances; Coccolithophores; subtropical North Atlantic

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Abstract:

Coccolithophore assemblage data from sediment core M35003-4 from the western subtropical North Atlantic Ocean spanning the past 55 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 5 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 magnification. Two samples were counted on SEM images at 2,000x magnification. A minimum of 288 coccoliths were counted. 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) coccoliths. The variety Rhabdosphaera clavigera var. stylifera was distinguished from Rhabdosphaera clavigera. Counts of unidentified and reworked 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) and is based on radiocarbon ages measured on planktonic foraminifera.

Keyword(s):

Assemblages; coccolith abundances; Coccolithophores; subtropical North Atlantic

Coverage:

Latitude: 12.090000 * Longitude: -61.243333

Date/Time Start: 1996-04-19T00:00:00 * Date/Time End: 1996-04-19T00:00:00

Minimum DEPTH, sediment/rock: 0.05 m * Maximum DEPTH, sediment/rock: 9.50 m

Event(s):

M35003-4 * Latitude: 12.090000 * Longitude: -61.243333 * Date/Time: 1996-04-19T00:00:00 * Elevation: -1299.0 m * Recovery: 9.63 m * Campaign: * Basis: * Method/Device: Gravity corer (Kiel type) (SL)

Parameter(s):

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

3834 data points

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