Citation:

j.palaeo.2011.01.019

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:

The present study is the first study on the stable oxygen isotope composition of the photosynthetic calcareous-walled dinoflagellate species Thoracosphaera heimii off NW Africa during the last 45,000 yr. T. heimii based temperature estimates of sediment core GeoB 8507-3 were compared with those obtained from the stable oxygen isotopes of the planktic foraminifera Globigerina bulloides and Globigerinoides ruber (pink), and the Mg/Ca ratio of G. ruber (pink).

We show that the isotopic composition of T. heimii and the temperature estimates based on the equation for inorganically precipitated calcite provide comparable results to those obtained from G. ruber (pink) isotopes and Mg/Ca ratios with exception of the Early Holocene and the Younger Dryas. The recently proposed palaeotemperature equation of Zonneveld et al. (2007), however, provides unrealistic temperature reconstructions that are about 16 °C lower than those based on planktic foraminifera. Thus, this equation needs to be revised. The difference between T. heimii and G. bulloides isotopic and temperature reconstructions can be ascribed to differences in the ecology of both species, especially with regard to their depth habitat and/or seasonal production in the research area.

All temperature proxies suggest comparable conditions during the last glacial and Holocene. Small differences between the reconstructed temperature values of T. heimii and the other proxies can be explained by differences in seasonal production of the individual species. The relatively low temperatures recorded by T. heimii at about 15,000 to 8,000 yr BP are interpreted to reflect an increase in duration and/or intensity of the upwelling in the vicinity of the core site in comparison to the last glacial, with an abrupt and strong decrease of upwelling intensity and/or duration during the Early Holocene and the Younger Dryas.

Related to:

Kohn, Marion (2009): The stable oxygen isotope signal of the calcareous-walled dinoflagellate Thoracosphaera heimii as a new proxy for sea-surface temperature. PhD Thesis, Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany, urn:nbn:de:gbv:46-diss000117626

Project(s):

Center for Marine Environmental Sciences (MARUM)

Coverage:

Latitude: 19.475000 * Longitude: -18.099500

Date/Time Start: 2003-04-27T14:05:00 * Date/Time End: 2003-04-27T14:05:00

Minimum DEPTH, sediment/rock: 0.05 m * Maximum DEPTH, sediment/rock: 8.10 m

Event(s):

GeoB8507-3 * Latitude: 19.475000 * Longitude: -18.099500 * Date/Time: 2003-04-27T14:05:00 * Elevation: -2411.0 m * Recovery: 10 m * Campaign: * Basis: * Method/Device: Gravity corer (Kiel type) (SL) * Comment: see core description

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m			Geocode
2	Age model	Age model	ka	Kohn, Marion	Age, 14C AMS
3	Age, standard deviation	Age std dev	±	Kohn, Marion
4	Globigerina bulloides, δ18O	G. bulloides δ18O	‰ PDB	Kohn, Marion	Mass spectrometer Finnigan MAT 251
5	Thoracosphaera heimii, δ18O	T. heimii δ18O	‰ PDB	Kohn, Marion	Mass spectrometer Finnigan MAT 251
6	Globigerinoides ruber pink, δ18O	G. ruber p δ18O	‰ PDB	Kohn, Marion	Mass spectrometer Finnigan MAT 251

License:

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

Size:

385 data points

Data

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

1 Depth sed [m]	2 Age model [ka]	3 Age std dev [±]	4 G. bulloides δ18O [‰ PDB]	5 T. heimii δ18O [‰ PDB]	6 G. ruber p δ18O [‰ PDB]
0.05			-0.19
0.10	0.925	0.04	-0.26	-0.78	-1.41
0.15			-0.22	-0.84
0.20			-0.30	-0.39	-1.35
0.25			-0.16	-0.67
0.30			-0.09	-1.11	-1.38
0.35			-0.24	-0.65
0.40			0.25	-1.05	-1.12
0.45			-0.23	-0.69
0.50			0.15	-0.82	-0.95
0.55			0.10	-0.76
0.60			0.03	-0.65	-1.00
0.65			0.07	-0.52
0.70			0.01	-0.57	-1.11
0.75			0.18	-0.64
0.80			0.08	-0.24	-0.82
0.85	8.070	0.07	-0.17	-0.04
0.90			0.18	-0.24	-1.04
0.95			0.26	0.27
1.00			0.45	-0.86	-0.94
1.05			0.07	0.22
1.10			-0.03	0.25	-1.22
1.15			0.50	0.03
1.20			0.22	0.20	-0.69
1.25			0.73	0.22
1.35				0.15	-0.33
1.40			0.64	0.09	0.07
1.45				0.10
1.50			0.74	-0.50	0.03
1.55	11.530	0.09	0.93	-0.32
1.60			1.10	-1.06	0.10
1.65			0.77	-0.65
1.70			0.93	-0.16	-0.12
1.75			0.92	0.41
1.80			0.79	0.61
1.85			0.90		-0.42
1.90			0.71	0.64
1.95			0.99	0.53
2.00			1.04	0.81	0.24
2.05			0.99	0.45
2.10			0.90	0.25	-0.16
2.15			1.18	0.54
2.20			1.59	0.16	0.70
2.25				0.87	0.13
2.35				0.27
2.40			0.96	0.22	0.57
2.45				0.36
2.50			1.10	0.05	0.47
2.55			1.28	0.52
2.60			1.26	0.06	0.96
2.65			1.33	0.39
2.70			1.46	0.26	0.83
2.75			1.50	0.75
2.80			1.54	0.26	0.91
2.85			1.57	0.35
2.90			1.34	0.04	0.13
2.95			1.29	0.29
3.00			1.30	-0.12	0.97
3.05			1.17	0.27
3.10			1.35	0.23	0.09
3.15				0.70
3.20			1.25	0.24	0.00
3.25			1.48
3.30			0.98	0.23	0.47
3.35			1.29	0.49
3.40			1.22	0.12	-0.04
3.45			1.23	0.68
3.50			1.13	0.16
3.55			1.00	0.53	-0.01
3.65			1.40	0.56
3.70			1.63	0.21	0.24
3.75			1.46	0.26
3.80			1.27	-0.08	0.28
3.85			1.08	0.32
3.90			1.42	-0.13	0.64
3.95			1.20	0.37
4.00			1.32	0.10	0.43
4.05			1.31	0.36
4.10			0.87	0.67	0.07
4.15			1.02	0.75
4.25				0.41	0.35
4.35			1.39	0.55	0.57
4.40			1.33	0.32	0.59
4.45			1.37	0.73
4.50			1.24	0.16	0.55
4.55			1.31	0.81
4.60			1.28	0.03	0.28
4.65			1.41	0.49
4.70			1.32	0.06	0.39
4.75			1.58	0.68
4.80			1.31	0.08	0.20
4.85			1.42	0.61
4.90			1.35	0.05	0.54
4.95			1.34	0.44
5.00			1.41	0.01	0.13
5.05			1.46	0.72
5.10			1.48	-0.10	-0.07
5.15			1.50	0.60
5.20			1.56	0.11	0.39
5.25			1.23	0.47
5.30			1.19	0.24	-0.29
5.35			1.32	0.39
5.40			1.23	0.08	-0.03
5.45			1.19	0.31
5.50			1.20	0.07	0.36
5.55			0.78	0.57
5.60			1.21	0.13	0.19
5.65			1.11	0.47
5.70			1.05	0.25	0.32
5.75			1.14	0.56
5.80			0.95	0.09	0.54
5.85			0.93	0.18
5.90			0.92	0.00	-0.06
5.95			1.14	0.42
6.00			1.05	-0.02	0.57
6.05			1.17	0.27
6.10			1.19	-0.06	-0.03
6.15			1.34	0.34
6.20			1.34	-0.09	0.48
6.25			1.08	0.32
6.30			1.16	0.07	0.09
6.35			0.64	0.33
6.40			1.13	0.14	0.27
6.45			1.07	0.44
6.50			1.27	0.09	-0.22
6.55			0.97	0.36
6.60			1.09	0.12	0.13
6.65			1.00	0.40
6.70			1.22	-0.07	-0.54
6.75			1.11	0.59
6.80			0.97	0.04	-0.12
6.85			0.98	-0.18
6.90			1.08	0.08	0.52
6.95			0.90	0.33
7.00			0.98	0.07	0.16
7.05			1.23	0.11
7.10			1.15	0.07	-0.33
7.15			1.23	0.33
7.20			1.23	-0.14	-0.62
7.25			1.40	0.48
7.30			0.99	0.06	-0.77
7.35			0.97	0.52
7.40			1.27	0.15	-0.19
7.45			1.48	0.30
7.50			1.35	0.09	0.32
7.55			1.25	0.30
7.60			1.00	0.22	0.12
7.65			1.42	0.23
7.70			1.14	0.22	0.65
7.75			1.16
7.80			1.49	-0.04	-0.24
7.85			1.33
7.90			1.39	0.11	-0.56
7.95			1.46
8.00			1.49	0.13	-0.73
8.05			1.30
8.10			1.31	0.21	-0.12