Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Aarhus University AU http://www.au.dk/en/ https://ror.org/01aj84f44 Seidenkrantz Marit-Solveig mss@geo.au.dk 0000-0002-1973-5969 Aarhus University AU http://www.au.dk/en/ https://ror.org/01aj84f44 2026 Depth‑resolved CHI metrics, ecological preference indices, and coccolith species percentages for core DA12‑11/2‑ST1‑GC01 dataset https://doi.pangaea.de/10.1594/PANGAEA.996253 2026-07-31T08:36:04 https://doi.org/10.1594/PANGAEA.996263 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. Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Seidenkrantz Marit-Solveig mss@geo.au.dk 0000-0002-1973-5969 in press Holocene hydrography of the Iceland Basin from coccolith ecological contrasts: A multi‑axis index for salinity and stratification journal article Marine Micropaleontology -20.70273 -20.70273 61.60893 61.60893 -20.70273 61.60893 2025-09-12T14:20:00 2025-09-12T14:20:00 0.005 4.18 DA12-11/2-GC01 G1 61.60893 -20.70273 Iceland Basin -2120.0 2025-09-12T14:20:00 Dana12-11 Dana12-11 Reykjavik, Iceland 2012-09-24T00:00:00 2012-09-24 Hirtshals, Denmark 2012-09-30T00:00:00 2012-09-30 Dana (1981) https://dana.dtu.dk/en/historien-om-dana Røy, Hans Røy, Hans https://geo.au.dk/fileadmin/ingen_mappe_valgt/Paleoceanography_group/Benthic_Marine_Research_Course_Final_Report_2013_v3.pdf Dana (1981) https://dana.dtu.dk/en/historien-om-dana Gravity corer GC 2160 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ DEPTH, sediment/rock Depth sed m depth http://purl.obolibrary.org/obo/PATO_0001595 sediment http://purl.obolibrary.org/obo/ENVO_00002007 rock Length L http://dbpedia.org/resource/Length Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Depth sed [m] Depth, top/min Depth top m depth http://purl.obolibrary.org/obo/PATO_0001595 Length L http://dbpedia.org/resource/Length Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Depth top [m] Depth, bottom/max Depth bot m depth http://purl.obolibrary.org/obo/PATO_0001595 maximal max Length L http://dbpedia.org/resource/Length Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Depth bot [m] AGE Age ka BP http://en.wikipedia.org/wiki/Kyr age http://purl.obolibrary.org/obo/PATO_0000011 Time T http://dbpedia.org/resource/Time Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Age [ka BP] Coccolithophore hydrographic index CHI Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 CHI Logarithm log logarithm log Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 log10(CHI) log (log10(CHI)) Z-score Z-score Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 CHI z-score Z-score (CHI z-score) Ecological sum index Sum index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Warm sum Sum index (Warm sum) Ecological sum index Sum index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Cold sum Sum index (Cold sum) Ecological sum index Sum index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 HighSal sum Sum index (HighSal sum) Ecological sum index Sum index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 LowSal sum Sum index (LowSal sum) Ecological sum index Sum index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Oligo sum Sum index (Oligo sum) Ecological sum index Sum index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Nutrient sum Sum index (Nutrient sum) Ecological sum index Sum index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Stratified sum Sum index (Stratified sum) Ecological sum index Sum index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Mixing sum Sum index (Mixing sum) Hydrographic contrast index Contrast index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Thermal contrast Contrast index (Thermal contrast) Hydrographic contrast index Contrast index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Salinity contrast Contrast index (Salinity contrast) Hydrographic contrast index Contrast index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Nutrient contrast Contrast index (Nutrient contrast) Hydrographic contrast index Contrast index Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 StratMix contrast Contrast index (StratMix contrast) Calcidiscus leptoporus C. leptoporus % http://www.marinespecies.org/aphia.php?p=taxdetails&id=235923 Calcidiscus leptoporus https://www.marinespecies.org/aphia.php?p=taxdetails&id=235923 Dimensionless Ratio ψ Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 C. leptoporus [%] Coccolithus pelagicus C. pelagicus % Coccolithus pelagicus https://www.marinespecies.org/aphia.php?p=taxdetails&id=178600 Dimensionless Ratio ψ Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 C. pelagicus [%] Emiliania huxleyi E. huxleyi % http://www.marinespecies.org/aphia.php?p=taxdetails&id=115104 Emiliania huxleyi https://www.marinespecies.org/aphia.php?p=taxdetails&id=115104 Dimensionless Ratio ψ Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 E. huxleyi [%] Gephyrocapsa spp. Gephyrocapsa spp. % http://www.marinespecies.org/aphia.php?p=taxdetails&id=235823 Gephyrocapsa https://www.marinespecies.org/aphia.php?p=taxdetails&id=235823 Dimensionless Ratio ψ Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Gephyrocapsa spp. [%] Helicosphaera carteri H. carteri % http://www.marinespecies.org/aphia.php?p=taxdetails&id=615435 Helicosphaera carteri https://www.marinespecies.org/aphia.php?p=taxdetails&id=615435 Dimensionless Ratio ψ Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 H. carteri [%] Pontosphaera discopora P. discopora % Pontosphaera discopora https://www.marinespecies.org/aphia.php?p=taxdetails&id=235970 Dimensionless Ratio ψ Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 P. discopora [%] Pontosphaera japonica P. japonica % Pontosphaera japonica https://www.marinespecies.org/aphia.php?p=taxdetails&id=555941 Dimensionless Ratio ψ Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 P. japonica [%] Syracosphaera pulchra S. pulchra % http://www.marinespecies.org/aphia.php?p=taxdetails&id=235979 Syracosphaera pulchra https://www.marinespecies.org/aphia.php?p=taxdetails&id=235979 Dimensionless Ratio ψ Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 S. pulchra [%] Umbilicosphaera spp. Umbilicosphaera spp. % http://www.marinespecies.org/aphia.php?p=taxdetails&id=235857 Umbilicosphaera https://www.marinespecies.org/aphia.php?p=taxdetails&id=235857 Dimensionless Ratio ψ Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Umbilicosphaera spp. [%] Braarudosphaera bigelowii B. bigelowii % http://www.marinespecies.org/aphia.php?p=taxdetails&id=235922 Braarudosphaera bigelowii https://www.marinespecies.org/aphia.php?p=taxdetails&id=235922 Dimensionless Ratio ψ Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 B. bigelowii [%] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels CHI index coccolith assemblages Coccolithophores ecological contrasts ecological polarity Holocene nutrient contrast salinity contrast stratification–mixing dynamics thermal contrast author118597 author28069 basis4446 campaign3423278 curlevel30 event2970337 geocode1 geocode1599 geocode1600 geocode1601 geocode2205 geocode8128 inst20913 journal10825 license21 method11107 param1052 param1140 param1265 param137479 param1404 param14619 param3 param4 param541011 param567701 param567702 param567703 param6141 param6157 param628 param7637 param906 pi118597 ref140894 term1061613 term1061640 term1061677 term1061682 term1061692 term1061718 term1061755 term1062263 term1062276 term1062352 term1073131 term1073135 term21355 term38263 term38561 term390 term40135 term41056 term43794 term43863 term43975 term48664 term77707 term78404 term78406 term78408 term78409 term78413 term78433 term78434 term78435 term78436