Citation:

PANGAEA.974789

Name: Nannofossil absolute abundances of sediment core GeoB1117-2
Published: 2025-01-28
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Coccoliths; coccolith species abundances; Equatorial Atlantic

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Published: 2025-01-28 • DOI registered: 2025-02-26

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Abstract:

The present study was initiated to ascertain the significance of coccolithophores as a proxy for paleoceanographic and paleoproductivity studies in the equatorial Atlantic. Data from a range of different samples, from the plankton, surface sediments as well as sediment cores are shown and compared with each other. During the past 140,000 years the surface water circulation of the equatorial Atlantic has changed drastically, as can be seen from changes in the coccolithophore species composition, absolute coccolith numbers. Significant increases in coccolith numbers and accumulation rates is observed in the southern equatorial Atlantic during the last glacial interval (oxygen isotope stages 2–4), which we attribute to enhanced upwelling intensities and advection of cool nutrient-rich waters at this site. In the western equatorial Atlantic we observe an opposite trend with decreasing numbers of coccoliths during glacial periods, which probably is caused by a deepening of the thermocline.

Keyword(s):

Coccoliths; coccolith species abundances; Equatorial Atlantic

Related to:

Kinkel, Hanno; Baumann, Karl-Heinz; Cepek, Martin (2000): Coccolithophores in the equatorial Atlantic Ocean: response to seasonal and Late Quaternary surface water variability. Marine Micropaleontology, 39(1-4), 87-112, https://doi.org/10.1016/S0377-8398(00)00016-5

Project(s):

Center for Marine Environmental Sciences (MARUM)

Coverage:

Latitude: -3.815000 * Longitude: -14.896660

Date/Time Start: 1989-03-05T00:00:00 * Date/Time End: 1989-03-05T00:00:00

Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 10.08 m

Event(s):

GeoB1117-2 * Latitude: -3.815000 * Longitude: -14.896660 * Date/Time: 1989-03-05T00:00:00 * Elevation: -3984.0 m * Penetration: 16 m * Recovery: 15.3 m * Location: Brazil Basin * Campaign: * Basis: * Method/Device: Gravity corer (Kiel type) (SL) * Comment: cc: Karbonatschlamm, Foram.

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	Coccoliths	Cocco	#	Baumann, Karl-Heinz	Counted	Totally counted
4	Coccoliths, total	Cocco	10⁶ #/g	Baumann, Karl-Heinz	Calculated, see reference(s)
5	Emiliania huxleyi	E. huxleyi	%	Baumann, Karl-Heinz	Calculated, see reference(s)
6	Gephyrocapsa ericsonii	G. ericsonii	%	Baumann, Karl-Heinz	Calculated, see reference(s)
7	Gephyrocapsa muellerae	G. muellerae	%	Baumann, Karl-Heinz	Calculated, see reference(s)
8	Gephyrocapsa oceanica	G. oceanica	%	Baumann, Karl-Heinz	Calculated, see reference(s)
9	Florisphaera profunda	F. profunda	%	Baumann, Karl-Heinz	Calculated, see reference(s)
10	Calcidiscus leptoporus	C. leptoporus	%	Baumann, Karl-Heinz	Calculated, see reference(s)
11	Umbilicosphaera sibogae	U. sibogae	%	Baumann, Karl-Heinz	Calculated, see reference(s)

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

846 data points

Data

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

1 Depth sed [m]	2 Age [ka BP]	3 Cocco [#]	4 Cocco [10⁶ #/g]	5 E. huxleyi [%]	6 G. ericsonii [%]	7 G. muellerae [%]	8 G. oceanica [%]	9 F. profunda [%]	10 C. leptoporus [%]	11 U. sibogae [%]
0.00	0.0003	329	15911	35.3	0.6	0.0	0.3	30.1	14.9	3.0
0.04	0.0008	191	7453	28.3	1.0	0.0	1.0	32.5	19.9	0.5
0.03	0.0010	402	2511	44.2	0.0	0.0	0.8	22.8	20.5	2.6
0.08	0.0021	403	5630	39.8	0.0	0.0	2.2	26.9	13.4	4.5
0.13	0.0034	453	7039	35.5	0.0	0.4	0.7	24.4	14.7	8.0
0.23	0.0076	466	5610	30.4	0.0	0.0	3.2	31.5	9.2	3.4
0.28	0.0087	475	20676	37.1	0.0	0.0	5.1	22.2	14.8	3.2
0.33	0.0098	320	21959	34.1	0.0	0.0	6.6	21.5	11.0	4.1
0.38	0.0109	398	20510	25.3	0.0	0.0	10.4	28.1	12.7	1.8
0.43	0.0120	362	23021	22.2	0.0	0.3	8.3	29.9	14.6	4.8
0.48	0.0135	428	20341	22.6	0.0	0.0	9.4	36.0	12.0	1.6
0.58	0.0149	378	26378	24.7	1.1	0.0	8.5	22.8	16.8	3.7
0.68	0.0164	347	8512	15.7	0.3	0.0	17.2	17.7	21.8	5.0
0.78	0.0188	287	14206	17.8	0.3	0.0	5.2	30.3	24.4	5.9
0.88	0.0209	467	63115	23.1	1.1	0.0	8.4	24.2	19.2	10.0
0.93	0.0229	399	18581	18.6	1.5	0.0	8.0	23.9	24.1	8.5
0.98	0.0249	363	24421	15.4	5.8	0.0	9.4	15.4	23.2	5.6
1.08	0.0270	314	23230	23.6	3.8	0.0	11.8	11.8	26.8	4.2
1.18	0.0296	395	66572	22.3	2.5	0.0	5.1	14.9	32.7	3.0
1.28	0.0327	427	29483	30.8	4.7	0.2	2.1	11.8	34.5	2.1
1.38	0.0358	285	15977	13.7	11.2	0.0	2.5	16.1	38.9	2.9
1.48	0.0389	331	50383	24.5	4.8	0.6	3.0	11.8	35.3	3.9
1.58	0.0421	314	22590	24.2	7.0	1.3	4.8	10.8	33.4	4.1
1.68	0.0452	316	29342	13.0	5.7	0.0	4.1	19.3	37.0	6.6
1.78	0.0483	421	62411	20.4	3.3	0.5	4.8	22.6	27.1	4.6
1.88	0.0514	385	80041	16.9	10.6	0.0	5.2	15.8	34.0	3.9
1.98	0.0540	324	34120	16.0	11.4	0.6	7.4	18.2	28.4	4.4
2.08	0.0560	330	17620	13.3	11.8	0.0	4.2	19.7	33.3	2.1
2.18	0.0580	304	37980	16.1	4.6	0.0	4.9	30.3	11.5	7.9
2.28	0.0620	326	37273	13.5	1.8	0.0	9.2	28.2	12.5	8.6
2.38	0.0670	309	19870	12.9	7.4	1.3	12.6	20.7	19.4	8.4
2.48	0.0710	331	18293	8.8	6.3	0.3	16.9	18.1	30.2	3.3
2.58	0.0740	390	36960	4.6	6.7	0.3	6.4	28.5	15.6	8.0
2.68	0.0770	324	25174	3.4	19.4	0.0	2.5	21.0	9.8	3.4
2.78	0.0800	265	23569	4.5	14.0	0.0	0.8	29.4	8.0	1.5
2.88	0.0835	321	25457	5.3	3.1	0.3	2.2	47.2	12.7	2.2
3.08	0.0910	289	32532	12.1	4.5	0.3	5.9	14.5	15.6	4.9
3.18	0.0950	312	20183	10.9	11.2	0.3	5.4	18.6	13.1	2.9
3.28	0.0990	366	29416	5.5	10.1	1.1	2.2	20.8	9.1	1.6
3.38	0.1022	329	19521	3.6	8.2	0.0	3.0	29.5	13.1	2.1
3.48	0.1054	304	14288	1.3	10.5	0.7	3.3	27.0	9.2	4.0
3.58	0.1087	331	13481	3.9	6.3	0.0	7.6	29.0	16.3	5.4
3.68	0.1120	288	13952	9.4	5.2	0.0	6.9	26.0	18.1	5.5
3.78	0.1153	336	14706	12.2	8.9	0.3	2.4	28.3	12.2	1.8
3.88	0.1187	323	11576	13.9	8.4	0.3	2.8	32.5	9.3	3.4
3.98	0.1220	327	13859	4.3	4.6	0.9	2.4	48.3	9.1	4.3
4.08	0.1260	345	12122	2.9	4.6	0.6	7.8	42.3	8.9	4.0
4.18	0.1298	317	20555	4.7	5.0	0.0	13.6	28.1	8.5	3.2
4.28	0.1333	287	22137	5.9	3.8	0.7	20.9	13.6	21.6	7.7
4.38	0.1364	310	16230	7.4	2.6	3.9	25.8	9.7	20.0	7.4
4.48	0.1391	311	11417	4.5	7.4	1.0	15.8	22.2	21.5	10.0
4.58	0.1419	211	10468	10.0	9.5	0.9	14.7	17.1	17.5	7.1
4.68	0.1446	258	16425	3.1	19.0	1.2	8.1	22.1	14.0	5.0
4.78	0.1470	283	24773	2.1	27.6	2.1	3.2	32.2	2.5	4.3
4.88	0.1490	329	8657	1.8	19.8	1.5	5.2	25.2	8.2	7.0
4.98	0.1510	353	16124	1.7	21.2	4.8	14.4	13.6	11.0	4.5
5.88	0.1511	342	8090	6.4	11.7	10.5	8.8	14.6	22.5	2.7
5.98	0.1555	299	15759	1.0	12.4	10.0	9.7	19.4	13.4	4.0
6.08	0.1599	320	14099	3.4	8.4	10.6	4.4	19.7	13.8	3.1
6.18	0.1644	344	19237	5.2	21.8	6.1	4.9	12.8	15.4	4.3
6.28	0.1688	358	22035	2.2	29.1	0.6	8.9	21.5	13.1	1.7
6.38	0.1730	333	21627	0.9	19.5	1.2	11.7	33.9	8.7	3.0
6.58	0.1810	270	44545	1.6	8.8	6.0	30.3	11.0	12.6	4.7
6.68	0.1838	375	15402	1.9	12.2	4.8	24.8	11.9	13.7	4.1
6.78	0.1853	319	29667	1.1	17.1	5.1	30.9	7.2	14.7	4.0
7.18	0.1870	359	24002	3.4	28.8	1.3	19.4	10.7	17.0	2.8
7.28	0.1887	327	17549	2.8	24.0	2.8	16.7	13.4	15.1	2.2
7.38	0.1905	392	27400	1.8	27.8	2.4	12.2	18.3	11.9	1.2
7.68	0.1995	461	33759	1.5	30.4	2.0	13.8	13.0	9.7	3.5
7.78	0.2050	403	39554	0.0	34.1	2.0	16.3	11.0	6.6	0.9
7.88	0.2123	418	43228	0.9	42.7	3.9	6.3	11.5	3.7	0.9
7.98	0.2184	321	46998	0.7	50.7	4.7	2.5	19.6	1.7	0.9
8.08	0.2232	369	28897	0.2	19.4	2.2	9.6	23.7	3.6	2.4
8.18	0.2280	350	23933	0.8	23.2	1.7	17.8	10.5	12.7	4.5
8.28	0.2300	355	18850	0.8	33.6	1.9	13.6	15.4	7.1	3.0
8.33	0.2310	350	20425	1.4	23.7	2.9	19.7	19.4	8.9	2.3
8.38	0.2320	295	31490	5.6	27.3	2.5	17.2	14.4	9.0	3.7
8.48	0.2340	344	10398	5.1	27.8	1.0	18.3	8.8	13.2	5.0
8.58	0.2360	240	17941	2.0	42.7	2.3	8.4	16.3	3.2	1.7
8.68	0.2380	413	10609	3.3	34.2	1.7	6.7	14.6	4.6	2.9
8.78	0.2427	355	14320	3.9	16.9	2.7	10.4	25.9	8.7	4.6
8.88	0.2458	379	9511	3.1	23.7	3.1	13.2	17.5	7.9	4.6
8.98	0.2474	373	22987	8.4	15.8	4.0	16.1	16.1	5.8	7.9
9.08	0.2490	288	22212	9.9	11.8	4.8	16.6	8.6	10.2	7.2
9.18	0.2526	379	38282	6.6	14.2	1.4	16.3	9.7	12.8	5.5
9.28	0.2563	317	17291	9.0	25.3	8.2	11.3	9.0	9.5	3.9
9.38	0.2599	312	18853	3.5	19.9	7.9	11.7	9.5	12.0	4.8
9.48	0.2636	381	29623	0.6	23.1	14.1	6.7	15.7	10.6	3.5
9.58	0.2672	342	21732	0.5	11.5	24.4	7.6	20.5	6.8	3.1
9.68	0.2710	392	23175	1.8	16.4	14.9	10.2	13.7	7.3	7.0
9.78	0.2750	329	27164	1.3	7.9	13.2	4.3	10.9	6.1	2.8
9.88	0.2790	401	28895	0.3	12.2	17.0	6.1	9.4	5.8	1.2
9.98	0.2830	441	32060	0.2	21.9	20.4	3.5	9.2	1.7	2.5
10.08	0.2870	390	48072	0.0	14.1	16.3	5.7	8.6	2.5	2.1