Ukpabi, Ndubuisi; Seidenkrantz, Marit-Solveig (2026): Depth‑resolved CHI metrics, ecological preference indices, and coccolith species percentages for core DA12‑11/2‑ST1‑GC01 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996253 (DOI registration in progress), In: Ukpabi, N; Seidenkrantz, M-S (2026): High resolution Holocene coccolithophore assemblages, absolute abundances, and hydrographic index (CHI) calculations from sediment core DA12 11/2 ST1 GC01, Iceland Basin [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.996263
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Published: 2026-07-31
Abstract:
This dataset presents the full suite of ecological component scores, contrast indices, and Coccolithophore Hydrographic Index (CHI) transformations calculated for each sample of core DA12 11/2 ST1 GC01. For every depth and corresponding calibrated age, the table reports warm water, cold water, high salinity, low salinity, oligotrophic, nutrient rich, stratified, and mixing ecological sum indices, each representing the cumulative abundance of taxa assigned to a given ecological affinity. These sums form the basis for the hydrographic contrast indices, computed as the difference between opposing ecological sums (e.g., thermal contrast = warm_sum − cold_sum; salinity contrast = highSal_sum − lowSal_sum; nutrient contrast = oligotrophic_sum − nutrient_sum; stratification/mixing contrast = stratified_sum − mixing_sum). The contrasts quantify the ecological polarity of each assemblage and serve as the input structure for the CHI calculation. CHI values were derived by combining all four contrasts into a single dimensionless hydrographic proxy, subsequently transformed through log₁₀ scaling, z score standardization, and tanh normalization to enhance distributional behaviour and comparability across samples. This table also includes raw species percentages for all identified coccolithophore taxa, enabling direct linkage between ecological composition and hydrographic state. Together, these parameters provide a detailed, sample by sample reconstruction of ecological structure and hydrographic variability throughout the Holocene.
Keyword(s):
Related to:
Ukpabi, Ndubuisi; Seidenkrantz, Marit-Solveig (in press): Holocene hydrography of the Iceland Basin from coccolith ecological contrasts: A multi‑axis index for salinity and stratification. Marine Micropaleontology
Coverage:
Latitude: 61.608930 * Longitude: -20.702730
Date/Time Start: 2025-09-12T14:20:00 * Date/Time End: 2025-09-12T14:20:00
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 4.180 m
Event(s):
DA12-11/2-GC01 (G1) * Latitude: 61.608930 * Longitude: -20.702730 * Date/Time: 2025-09-12T14:20:00 * Elevation: -2120.0 m * Location: Iceland Basin * Campaign: Dana12-11 * Basis: Dana (1981) * Method/Device: Gravity corer (GC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Ukpabi, Ndubuisi | Geocode | |
| 2 | Depth, top/min | Depth top | m | Ukpabi, Ndubuisi | ||
| 3 | Depth, bottom/max | Depth bot | m | Ukpabi, Ndubuisi | ||
| 4 | AGE | Age | ka BP | Ukpabi, Ndubuisi | Geocode | |
| 5 | Coccolithophore hydrographic index | CHI | Ukpabi, Ndubuisi | |||
| 6 | Logarithm | log | Ukpabi, Ndubuisi | log10(CHI) | ||
| 7 | Z-score | Z-score | Ukpabi, Ndubuisi | CHI z-score | ||
| 8 | Ecological sum index | Sum index | Ukpabi, Ndubuisi | Warm sum | ||
| 9 | Ecological sum index | Sum index | Ukpabi, Ndubuisi | Cold sum | ||
| 10 | Ecological sum index | Sum index | Ukpabi, Ndubuisi | HighSal sum | ||
| 11 | Ecological sum index | Sum index | Ukpabi, Ndubuisi | LowSal sum | ||
| 12 | Ecological sum index | Sum index | Ukpabi, Ndubuisi | Oligo sum | ||
| 13 | Ecological sum index | Sum index | Ukpabi, Ndubuisi | Nutrient sum | ||
| 14 | Ecological sum index | Sum index | Ukpabi, Ndubuisi | Stratified sum | ||
| 15 | Ecological sum index | Sum index | Ukpabi, Ndubuisi | Mixing sum | ||
| 16 | Hydrographic contrast index | Contrast index | Ukpabi, Ndubuisi | Thermal contrast | ||
| 17 | Hydrographic contrast index | Contrast index | Ukpabi, Ndubuisi | Salinity contrast | ||
| 18 | Hydrographic contrast index | Contrast index | Ukpabi, Ndubuisi | Nutrient contrast | ||
| 19 | Hydrographic contrast index | Contrast index | Ukpabi, Ndubuisi | StratMix contrast | ||
| 20 | Calcidiscus leptoporus | C. leptoporus | % | Ukpabi, Ndubuisi | ||
| 21 | Coccolithus pelagicus | C. pelagicus | % | Ukpabi, Ndubuisi | ||
| 22 | Emiliania huxleyi | E. huxleyi | % | Ukpabi, Ndubuisi | ||
| 23 | Gephyrocapsa spp. | Gephyrocapsa spp. | % | Ukpabi, Ndubuisi | ||
| 24 | Helicosphaera carteri | H. carteri | % | Ukpabi, Ndubuisi | ||
| 25 | Pontosphaera discopora | P. discopora | % | Ukpabi, Ndubuisi | ||
| 26 | Pontosphaera japonica | P. japonica | % | Ukpabi, Ndubuisi | ||
| 27 | Syracosphaera pulchra | S. pulchra | % | Ukpabi, Ndubuisi | ||
| 28 | Umbilicosphaera spp. | Umbilicosphaera spp. | % | Ukpabi, Ndubuisi | ||
| 29 | Braarudosphaera bigelowii | B. bigelowii | % | Ukpabi, Ndubuisi |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
2160 data points
Download Data
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