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Ukpabi, Ndubuisi; Seidenkrantz, Marit-Solveig (2026): Depth‑resolved CHI metrics, ecological preference indices, and coccolith species percentages for core DA12‑11/2‑ST1‑GC01 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996253 (DOI registration in progress), In: Ukpabi, N; Seidenkrantz, M-S (2026): High resolution Holocene coccolithophore assemblages, absolute abundances, and hydrographic index (CHI) calculations from sediment core DA12 11/2 ST1 GC01, Iceland Basin [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.996263

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Published: 2026-07-31

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Abstract:
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.
Keyword(s):
CHI index; coccolith assemblages; Coccolithophores; ecological contrasts; ecological polarity; Holocene; nutrient contrast; salinity contrast; stratification–mixing dynamics; thermal contrast
Related to:
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
Coverage:
Latitude: 61.608930 * Longitude: -20.702730
Date/Time Start: 2025-09-12T14:20:00 * Date/Time End: 2025-09-12T14:20:00
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 4.180 m
Event(s):
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 (GC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
DEPTH, sediment/rockDepth sedmUkpabi, NdubuisiGeocode
Depth, top/minDepth topmUkpabi, Ndubuisi
Depth, bottom/maxDepth botmUkpabi, Ndubuisi
AGEAgeka BPUkpabi, NdubuisiGeocode
Coccolithophore hydrographic indexCHIUkpabi, Ndubuisi
LogarithmlogUkpabi, Ndubuisilog10(CHI)
Z-scoreZ-scoreUkpabi, NdubuisiCHI z-score
Ecological sum indexSum indexUkpabi, NdubuisiWarm sum
Ecological sum indexSum indexUkpabi, NdubuisiCold sum
10 Ecological sum indexSum indexUkpabi, NdubuisiHighSal sum
11 Ecological sum indexSum indexUkpabi, NdubuisiLowSal sum
12 Ecological sum indexSum indexUkpabi, NdubuisiOligo sum
13 Ecological sum indexSum indexUkpabi, NdubuisiNutrient sum
14 Ecological sum indexSum indexUkpabi, NdubuisiStratified sum
15 Ecological sum indexSum indexUkpabi, NdubuisiMixing sum
16 Hydrographic contrast indexContrast indexUkpabi, NdubuisiThermal contrast
17 Hydrographic contrast indexContrast indexUkpabi, NdubuisiSalinity contrast
18 Hydrographic contrast indexContrast indexUkpabi, NdubuisiNutrient contrast
19 Hydrographic contrast indexContrast indexUkpabi, NdubuisiStratMix contrast
20 Calcidiscus leptoporusC. leptoporus%Ukpabi, Ndubuisi
21 Coccolithus pelagicusC. pelagicus%Ukpabi, Ndubuisi
22 Emiliania huxleyiE. huxleyi%Ukpabi, Ndubuisi
23 Gephyrocapsa spp.Gephyrocapsa spp.%Ukpabi, Ndubuisi
24 Helicosphaera carteriH. carteri%Ukpabi, Ndubuisi
25 Pontosphaera discoporaP. discopora%Ukpabi, Ndubuisi
26 Pontosphaera japonicaP. japonica%Ukpabi, Ndubuisi
27 Syracosphaera pulchraS. pulchra%Ukpabi, Ndubuisi
28 Umbilicosphaera spp.Umbilicosphaera spp.%Ukpabi, Ndubuisi
29 Braarudosphaera bigelowiiB. bigelowii%Ukpabi, Ndubuisi
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
2160 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Depth sed [m]

Depth top [m]

Depth bot [m]

Age [ka BP]

CHI

log
(log10(CHI))

Z-score
(CHI z-score)

Sum index
(Warm sum)

Sum index
(Cold sum)
10 
Sum index
(HighSal sum)
11 
Sum index
(LowSal sum)
12 
Sum index
(Oligo sum)
13 
Sum index
(Nutrient sum)
14 
Sum index
(Stratified sum)
15 
Sum index
(Mixing sum)
16 
Contrast index
(Thermal contrast)
17 
Contrast index
(Salinity contrast)
18 
Contrast index
(Nutrient contrast)
19 
Contrast index
(StratMix contrast)
20 
C. leptoporus [%]
21 
C. pelagicus [%]
22 
E. huxleyi [%]
23 
Gephyrocapsa spp. [%]
24 
H. carteri [%]
25 
P. discopora [%]
26 
P. japonica [%]
27 
S. pulchra [%]
28 
Umbilicosphaera spp. [%]
29 
B. bigelowii [%]
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1.2051.201.213.06990.006927047-2.159451850-0.99225.066.914.966.914.966.925.066.90.3736920870.2227204900.2227204900.3736920874.666.910.17.38.10.00.03.00.00.0
1.2551.251.263.2413197.3596533002.2952583740.64678.415.241.415.241.415.278.415.25.1578944632.7236840972.7236840975.15789446310.915.237.026.16.52.20.02.20.00.0
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