de.pangaea.dataset996253 und de.pangaea.dataset996263 dataset PANGAEA
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https://www.pangaea.de/ information pointOfContact 2026-07-31T08:59:04Z https://doi.pangaea.de/10.1594/PANGAEA.996253 <gco:CharacterString>Depth‑resolved CHI metrics, ecological preference indices, and coccolith species percentages for core DA12‑11/2‑ST1‑GC01</gco:CharacterString> 2026-07-31T08:36:04 publication Ukpabi, Ndubuisi
edgar2005ng@gmail.com
https://orcid.org/0000-0002-8535-9041 information author Seidenkrantz, Marit-Solveig
mss@geo.au.dk
https://orcid.org/0000-0002-1973-5969 information author PANGAEA
info@pangaea.de
https://www.pangaea.de/ information publisher tableDigital 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. completed Ukpabi, Ndubuisi
edgar2005ng@gmail.com
https://orcid.org/0000-0002-8535-9041 information principalInvestigator CHI index coccolith assemblages Coccolithophores ecological contrasts ecological polarity Holocene nutrient contrast salinity contrast stratification–mixing dynamics thermal contrast theme <gco:CharacterString>PANGAEA Keyword List</gco:CharacterString> 1995-01-01 creation PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-4.0: Creative Commons Attribution 4.0 International textTable und geoscientificInformation -20.70273 -20.70273 61.60893 61.60893 2025-09-12T14:20:00 2025-09-12T14:20:00 0.005 4.18 DEPTH, sediment/rock physicalMeasurement m m Depth, top/min physicalMeasurement m m Depth, bottom/max physicalMeasurement m m AGE physicalMeasurement ka BP ka BP Coccolithophore hydrographic index thematicClassification Logarithm thematicClassification log10(CHI) Z-score thematicClassification CHI z-score Ecological sum index thematicClassification Warm sum Ecological sum index thematicClassification Cold sum Ecological sum index thematicClassification HighSal sum Ecological sum index thematicClassification LowSal sum Ecological sum index thematicClassification Oligo sum Ecological sum index thematicClassification Nutrient sum Ecological sum index thematicClassification Stratified sum Ecological sum index thematicClassification Mixing sum Hydrographic contrast index thematicClassification Thermal contrast Hydrographic contrast index thematicClassification Salinity contrast Hydrographic contrast index thematicClassification Nutrient contrast Hydrographic contrast index thematicClassification StratMix contrast Calcidiscus leptoporus physicalMeasurement % % Coccolithus pelagicus physicalMeasurement % % Emiliania huxleyi physicalMeasurement % % Gephyrocapsa spp. physicalMeasurement % % Helicosphaera carteri physicalMeasurement % % Pontosphaera discopora physicalMeasurement % % Pontosphaera japonica physicalMeasurement % % Syracosphaera pulchra physicalMeasurement % % Umbilicosphaera spp. physicalMeasurement % % Braarudosphaera bigelowii physicalMeasurement % % text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.996253?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: 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 2025-09-12T14:20:00 Related to <gco:CharacterString>Holocene hydrography of the Iceland Basin from coccolith ecological contrasts: A multi‑axis index for salinity and stratification</gco:CharacterString> Ukpabi, Ndubuisi
edgar2005ng@gmail.com
https://orcid.org/0000-0002-8535-9041 information author Seidenkrantz, Marit-Solveig
mss@geo.au.dk
https://orcid.org/0000-0002-1973-5969 information author documentHardcopy Marine Micropaleontology