de.pangaea.dataset963219 und de.pangaea.dataset965722 dataset PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact 2026-04-15T06:02:05Z https://doi.pangaea.de/10.1594/PANGAEA.963219 2024-04-15T13:21:40 publication https://doi.org/10.1594/PANGAEA.963219 Baumann, Karl-Heinz

baumann@uni-bremen.de

https://orcid.org/0000-0003-2109-5179 information author PANGAEA

info@pangaea.de

https://www.pangaea.de/ information publisher tableDigital Coccolithophore assemblage data from sediment core 162-984C from the subpolar North Atlantic ocean spanning the past 24 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 (LGM) to the current warm period covering the last deglaciation. Samples were analysed at 2-32 cm intervals and were prepared using a combined dilution/filtering technique as described by Andruleit (1996, doi:10.2307/1485964). Between 50 and 150 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 very low abundances in the LGM. 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) specimens. Furthermore, two subspecies of Coccolithus pelagicus were distinguished: Coccolithus pelagicus subsp. braarudii and Coccolithus pelagicus subsp. pelagicus. Counts of unidentified 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). It is based on radiocarbon ages measured on the planktonic foraminifera G. bulloides and N. pachyderma as well as tephra layers and benthic foraminifera δ18O isotope data calibrated to regional benthic foraminifera δ18O stacks (Lisiecki and Stern, 2016, doi:10.1002/2016pa003002). completed Baumann, Karl-Heinz

baumann@uni-bremen.de

https://orcid.org/0000-0003-2109-5179 information principalInvestigator Assemblages coccolith abundances Coccolithophores North Atlantic ODP theme 1995-01-01 creation PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-4.0: Creative Commons Attribution 4.0 International textTable und geoscientificInformation -24.0825 -24.0825 61.4253 61.4253 1995-07-28T08:20:00 1995-07-29T01:45:00 0.01 4.45 DEPTH, sediment/rock physicalMeasurement IODP Depth Scale Terminology; Mid depth m m Sample code/label thematicClassification DSDP/ODP/IODP sample designation AGE physicalMeasurement ka BP ka BP Acanthoica quattrospina physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Algirosphaera robusta physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Calcidiscus leptoporus ssp. leptoporus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A; < 5 µm # # Calcidiscus leptoporus ssp. leptoporus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A; >= 5 µm # # Calcidiscus leptoporus ssp. quadriperforatus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Calciosolenia brasiliensis physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Coccolithus pelagicus ssp. pelagicus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Coccolithus pelagicus ssp. braarudii physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Coronosphaera mediterranea physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Emiliania huxleyi physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Florisphaera profunda physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Gladiolithus flabellatus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Gephyrocapsa ericsonii physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Gephyrocapsa muellerae physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Gephyrocapsa oceanica physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Hayaster perplexus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Helicosphaera carteri physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Helicosphaera wallichii physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Oolithotus antillarum physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Oolithotus fragilis physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Ophiaster hydroideus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Papposphaera spp. physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Pontosphaera discopora physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Pontosphaera spp. physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Rhabdosphaera clavigera physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Reticulofenestra sessilis physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Syracosphaera pulchra physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Syracosphaera sp. physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Umbilicosphaera foliosa physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Umbilicosphaera sibogae physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Umbilicosphaera hulburtiana physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Umbellosphaera tenuis physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Umbellosphaera irregularis physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Umbellosphaera sp. physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Coccoliths indeterminata physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A # # Sample mass physicalMeasurement g g Split factor thematicClassification Magnification thematicClassification Frame width physicalMeasurement mm mm Transect length physicalMeasurement mm mm Scanned area physicalMeasurement mm**2 mm**2 Filter, area physicalMeasurement mm**2 mm**2 Acanthoica quattrospina physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Algirosphaera robusta physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Calcidiscus leptoporus ssp. leptoporus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A; < 5 µm 10**6 #/g 10**6 #/g Calcidiscus leptoporus ssp. leptoporus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A; >= 5 µm 10**6 #/g 10**6 #/g Calcidiscus leptoporus ssp. quadriperforatus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Calciosolenia brasiliensis physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Coccolithus pelagicus ssp. pelagicus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Coccolithus pelagicus ssp. braarudii physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Coronosphaera mediterranea physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Emiliania huxleyi physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Florisphaera profunda physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Gladiolithus flabellatus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Gephyrocapsa ericsonii physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Gephyrocapsa muellerae physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Gephyrocapsa oceanica physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Hayaster perplexus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Helicosphaera carteri physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Helicosphaera wallichii physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Oolithotus antillarum physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Oolithotus fragilis physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Ophiaster hydroideus physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Papposphaera spp. physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Pontosphaera discopora physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Pontosphaera spp. physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Rhabdosphaera clavigera physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Reticulofenestra sessilis physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Syracosphaera pulchra physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Syracosphaera sp. physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Umbilicosphaera foliosa physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Umbilicosphaera sibogae physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Umbilicosphaera hulburtiana physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Umbellosphaera tenuis physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Umbellosphaera irregularis physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Umbellosphaera sp. physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g Coccoliths indeterminata, per unit sediment mass physicalMeasurement Scanning electron microscope (SEM), Zeiss, DSM 940A 10**6 #/g 10**6 #/g text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.963219?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: 162-984C * LATITUDE: 61.425300 * LONGITUDE: -24.082500 * DATE/TIME START: 1995-07-28T08:20:00 * DATE/TIME END: 1995-07-29T01:45:00 * ELEVATION: -1649.0 m * Penetration: 290.4 m * Recovery: 296 m * LOCATION: North Atlantic Ocean * CAMPAIGN: Leg162 * BASIS: Joides Resolution * METHOD/DEVICE: Drilling/drill rig 31 core; 290.4 m cored; 0 m drilled; 101.9 % recovery 1995-07-28T08:20:00