PANGAEA_996253 Depth‑resolved CHI metrics, ecological preference indices, and coccolith species percentages for core DA12‑11/2‑ST1‑GC01 Ukpabi, Ndubuisi; Seidenkrantz, Marit-Solveig Depth‑resolved CHI metrics, ecological preference indices, and coccolith species percentages for core DA12‑11/2‑ST1‑GC01 2026-07-31 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.996253 Investigator Ndubuisi Ukpabi edgar2005ng@gmail.com Earth Science DEPTH, sediment/rock Depth, top/min Depth, bottom/max AGE Coccolithophore hydrographic index Logarithm Z-score Ecological sum index Hydrographic contrast index Calcidiscus leptoporus Coccolithus pelagicus Emiliania huxleyi Gephyrocapsa spp. Helicosphaera carteri Pontosphaera discopora Pontosphaera japonica Syracosphaera pulchra Umbilicosphaera spp. Braarudosphaera bigelowii geoscientificInformation CHI index coccolith assemblages Coccolithophores DA12-11/2-GC01 Dana12-11 ecological contrasts ecological polarity G1 Gravity corer Holocene nutrient contrast salinity contrast stratification–mixing dynamics thermal contrast Dana (1981) 2025-09-12 2025-09-12 Complete 61.60893 61.60893 -20.70273 -20.70273 0.005 m (DEPTH, sediment/rock) 4.18 m (DEPTH, sediment/rock) unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 2160 data points text/tab-separated-values 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

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. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.996253"!

http://en.wikipedia.org/wiki/Kyr AGE http://www.marinespecies.org/aphia.php?p=taxdetails&id=115104 Emiliania huxleyi http://www.marinespecies.org/aphia.php?p=taxdetails&id=235823 Gephyrocapsa spp. http://www.marinespecies.org/aphia.php?p=taxdetails&id=235857 Umbilicosphaera spp. http://www.marinespecies.org/aphia.php?p=taxdetails&id=235922 Braarudosphaera bigelowii http://www.marinespecies.org/aphia.php?p=taxdetails&id=235923 Calcidiscus leptoporus http://www.marinespecies.org/aphia.php?p=taxdetails&id=235979 Syracosphaera pulchra http://www.marinespecies.org/aphia.php?p=taxdetails&id=615435 Helicosphaera carteri https://dana.dtu.dk/en/historien-om-dana Dana (1981) PANGAEA_996263 DIF 9.4 2026-07-31 2026-07-31