Stolz, Katharina; Baumann, Karl-Heinz (2010): North Atlantic (Rockall Plateau) coccolith assemblage data for MIS 5 of ODP Hole 162-980B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.819718, Supplement to: Stolz, K; Baumann, K-H (2010): Changes in palaeoceanography and palaeoecology during Marine Isotope Stage (MIS) 5 in the eastern North Atlantic (ODP Site 980) deduced from calcareous nannoplankton observations. Palaeogeography, Palaeoclimatology, Palaeoecology, 292(1-2), 295-305, https://doi.org/10.1016/j.palaeo.2010.04.002
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Abstract:
Calcareous nannoplankton analyses on late quaternary sediments from the eastern North Atlantic ODP Site 980 (55°29'N, 14°42'W) provide detailed insight into palaeoceanographic and palaeoclimatic changes that occurred throughout the Termination II and the adjacent interglacial of the Marine Isotope Stage (MIS) 5. This study presents the development of the coccolith assemblage throughout the interglacial MIS 5 towards the beginning of the glacial MIS 4 in the vicinity of the Rockall Plateau and investigates and characterises the impact of climatic and environmental variations on the coccolith assemblage distribution between 135 and 65 ky.
In general, the coccolith assemblage is dominated by Gephyrocapsa muellerae and Emiliania huxleyi, whilst significant changes in palaeoceanographic and palaeoclimatic conditions are mainly shown by variations of subordinate species. A drastic increase in coccolith accumulation rates and a change from a less to a higher diverse species assemblage indicate a rapid increase in surface water temperatures during the onset of MIS 5 from c. 127.5 ky on. Highest coccolith numbers, high numbers of taxa and a large diversity indicate highest coccolithophore primary productivity and peak interglacial conditions during MIS 5.5, which are due to the high influence of relatively warm surface water to this region. Coccolith numbers peak again around 120 ky and decline afterwards but stay above glacial levels. The two cooling events of MIS 5.4 and 5.2 interrupt the generally warm conditions and are indicated by lowered coccolith numbers, a drop of thermophile species and a reduction of the species diversity. Decreasing coccolith numbers and a slightly reduced diversity indicate that environmental conditions deteriorated towards the onset of MIS 4. The analysis of the coccolith assemblage reveals that not only the stadial events MIS 5.4 and 5.2 are characterised by colder conditions, but furthermore confirms the upcoming notion that MIS 5.5 was terminated by a slight short-term cooling of the surface water which occurred around 124 ky.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 55.485000 * Longitude: -14.702300
Date/Time Start: 1995-07-11T01:40:00 * Date/Time End: 1995-07-11T13:00:00
Minimum DEPTH, sediment/rock: 10.970 m * Maximum DEPTH, sediment/rock: 18.400 m
Event(s):
162-980B * Latitude: 55.485000 * Longitude: -14.702300 * Date/Time Start: 1995-07-11T01:40:00 * Date/Time End: 1995-07-11T13:00:00 * Elevation: -2179.0 m * Penetration: 118.2 m * Recovery: 122.48 m * Location: South Atlantic Ocean * Campaign: Leg162 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 118.2 m cored; 0 m drilled; 103.6 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Sample code/label | Sample label | Stolz, Katharina | |||
| 3 | Coccoliths | Cocco | 106 #/g | Stolz, Katharina | Scanning electron microscope (SEM), Zeiss, DSM 940A | total number of coccoliths |
| 4 | Accumulation rate, coccoliths | Acc rate cocco | 106 #/cm2/ka | Stolz, Katharina | Calculated | total coccolith mass accumulation rate |
| 5 | Shannon Diversity Index | H' | Stolz, Katharina | Calculated with PAST 3.189 (Hammer et al. 2001) | ||
| 6 | Number of taxa | Taxa | # | Stolz, Katharina | coccolith taxa | |
| 7 | Gephyrocapsa muellerae | G. muellerae | 106 #/g | Stolz, Katharina | Scanning electron microscope (SEM), Zeiss, DSM 940A | |
| 8 | Emiliania huxleyi | E. huxleyi | 106 #/g | Stolz, Katharina | Scanning electron microscope (SEM), Zeiss, DSM 940A | |
| 9 | Calcidiscus leptoporus | C. leptoporus | 106 #/g | Stolz, Katharina | Scanning electron microscope (SEM), Zeiss, DSM 940A | |
| 10 | Coccolithus spp. | Coccolithus spp. | 106 #/g | Stolz, Katharina | Scanning electron microscope (SEM), Zeiss, DSM 940A | |
| 11 | Syracosphaera spp. | Syracosphaera spp. | 106 #/g | Stolz, Katharina | Scanning electron microscope (SEM), Zeiss, DSM 940A | |
| 12 | Helicosphaera carteri | H. carteri | 106 #/g | Stolz, Katharina | Scanning electron microscope (SEM), Zeiss, DSM 940A | |
| 13 | Gephyrocapsa ericsonii | G. ericsonii | 106 #/g | Stolz, Katharina | Scanning electron microscope (SEM), Zeiss, DSM 940A | |
| 14 | Coccolithophoridae, other | Coccolith o | 106 #/g | Stolz, Katharina | Scanning electron microscope (SEM), Zeiss, DSM 940A | including indeterminata |
| 15 | Nannofossils, reworked fossil | Nannos rew fossil | 106 #/g | Stolz, Katharina | Scanning electron microscope (SEM), Zeiss, DSM 940A | |
| 16 | Calcidiscus spp. | Calcidiscus spp. | % | Stolz, Katharina | + Coccolithus spp. | |
| 17 | Emiliania huxleyi | E. huxleyi | % | Stolz, Katharina | ||
| 18 | Gephyrocapsa muellerae | G. muellerae | % | Stolz, Katharina | ||
| 19 | Coccolithophoridae, other | Coccolith o | % | Stolz, Katharina |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1872 data points