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 hydrographic states and trend dynamics for core DA12‑11/2‑ST1‑GC01 dataset https://doi.pangaea.de/10.1594/PANGAEA.996254 2026-07-31T08:36:04 https://doi.org/10.1594/PANGAEA.996263 This dataset summarizes the classified hydrographic states, percentile thresholds, and trend behaviors derived from CHI_sx (state index) and CHI z scores across the DA12 11/2 ST1 GC01 Holocene sequence. Each depth interval is assigned to a hydrographic state class (Low, Normal, or High), a percentile category (including Q10 and Q90 extremes), and a trend designation reflecting warming, cooling, or alternating/neutral conditions based on rolling slope analysis. These classifications are paired with species level coccolithophore percentages and ecozone assignments, enabling interpretation of ecological community structure within its hydrographic context. The table provides a categorical, decision ready framework for identifying hydrographic anomalies, transitions between Atlantic dominated and Polar influenced surface waters, and intervals of ecological stability or directional change. By combining state, trend, and ecozone information, this table offers a synthesized view of Holocene surface water dynamics that complements the quantitative CHI metrics and supports high resolution paleoenvironmental reconstruction. 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 1600 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] Hyperbolic tangent tanh Length L http://dbpedia.org/resource/Length Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 tanh scaled state index CHI_sx tanh Z-score Z-score Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 CHI z-score Z-score Class Class Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Hydrographic state class Class Percentile threshold, description Percentile threshold descr Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Percentile flags (Low, Normal, High) Percentile threshold descr Trend class Trend class Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Warming, Cooling, Alternating Trend class Trend arrow Trend arrow Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Trend arrow State–trend combination State–trend combination Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 State–trend combination 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 [%] Ecozone Ecozone Ukpabi Ndubuisi edgar2005ng@gmail.com 0000-0002-8535-9041 Zones 1–5 Ecozone CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels ecological regime shifts ecozones Holocene hydrography hydrographic reconstruction hydrographic state classification Iceland Basin Micropaleontology paleoceanographic interpretation Polar Water surface water variability author118597 author28069 basis4446 campaign3423278 curlevel30 event2970337 geocode1 geocode1599 geocode1600 geocode1601 geocode2205 geocode8128 inst20913 journal10825 license21 method11107 param1052 param1140 param1265 param1404 param14619 param25420 param3 param4 param541011 param567717 param567718 param567720 param567721 param567722 param567723 param6141 param6157 param628 param7637 param906 pi118597 ref140894 term1061613 term1061640 term1061677 term1061682 term1061692 term1061718 term1061755 term1062263 term1062276 term1062352 term1073131 term1073135 term21355 term38263 term38561 term41056 term43794 term43863 term43975 term50476 term77707 term78404 term78405 term78410 term78414 term78437 term78438 term78439 term78440 term78441 term78442