https://doi.pangaea.de/10.1594/PANGAEA.996254Ukpabi, NdubuisiNdubuisiUkpabi0000-0002-8535-9041Aarhus UniversitySeidenkrantz, Marit-SolveigMarit-SolveigSeidenkrantz0000-0002-1973-5969Aarhus UniversityPANGAEA2026ecological regime shiftsecozonesHolocene hydrographyhydrographic reconstructionhydrographic state classificationIceland BasinMicropaleontologypaleoceanographic interpretationPolar Watersurface water variabilityDEPTH, sediment/rockDepth, top/minDepth, bottom/maxAGEHyperbolic tangentZ-scoreClassPercentile threshold, descriptionTrend classTrend arrowState–trend combinationCalcidiscus leptoporusCoccolithus pelagicusEmiliania huxleyiGephyrocapsa spp.Helicosphaera carteriPontosphaera discoporaPontosphaera japonicaSyracosphaera pulchraUmbilicosphaera spp.Braarudosphaera bigelowiiEcozoneGravity corerDana12-11Dana (1981)2025-09-12T14:20:00Dataset10.1594/PANGAEA.9962631600 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalThis 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.-20.7027361.60893Iceland Basin