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Ukpabi, Ndubuisi; Seidenkrantz, Marit-Solveig (2026): Depth‑resolved CHI hydrographic states and trend dynamics for core DA12‑11/2‑ST1‑GC01 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996254 (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 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.
Keyword(s):
ecological regime shifts; ecozones; Holocene hydrography; hydrographic reconstruction; hydrographic state classification; Iceland Basin; Micropaleontology; paleoceanographic interpretation; Polar Water; surface water variability
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
Hyperbolic tangenttanhUkpabi, Ndubuisitanh scaled state index CHI_sx
Z-scoreZ-scoreUkpabi, NdubuisiCHI z-score
ClassClassUkpabi, NdubuisiHydrographic state class
Percentile threshold, descriptionPercentile threshold descrUkpabi, NdubuisiPercentile flags (Low, Normal, High)
Trend classTrend classUkpabi, NdubuisiWarming, Cooling, Alternating
10 Trend arrowTrend arrowUkpabi, Ndubuisi
11 State–trend combinationState–trend combinationUkpabi, Ndubuisi
12 Calcidiscus leptoporusC. leptoporus%Ukpabi, Ndubuisi
13 Coccolithus pelagicusC. pelagicus%Ukpabi, Ndubuisi
14 Emiliania huxleyiE. huxleyi%Ukpabi, Ndubuisi
15 Gephyrocapsa spp.Gephyrocapsa spp.%Ukpabi, Ndubuisi
16 Helicosphaera carteriH. carteri%Ukpabi, Ndubuisi
17 Pontosphaera discoporaP. discopora%Ukpabi, Ndubuisi
18 Pontosphaera japonicaP. japonica%Ukpabi, Ndubuisi
19 Syracosphaera pulchraS. pulchra%Ukpabi, Ndubuisi
20 Umbilicosphaera spp.Umbilicosphaera spp.%Ukpabi, Ndubuisi
21 Braarudosphaera bigelowiiB. bigelowii%Ukpabi, Ndubuisi
22 EcozoneEcozoneUkpabi, NdubuisiZones 1–5
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1600 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]

tanh

Z-score

Class

Percentile threshold descr

Trend class
10 
Trend arrow
11 
State–trend combination
12 
C. leptoporus [%]
13 
C. pelagicus [%]
14 
E. huxleyi [%]
15 
Gephyrocapsa spp. [%]
16 
H. carteri [%]
17 
P. discopora [%]
18 
P. japonica [%]
19 
S. pulchra [%]
20 
Umbilicosphaera spp. [%]
21 
B. bigelowii [%]
22 
Ecozone
0.0050.000.01-0.0147-0.962-1.972LowLow (≤Q10)Warming trendLow + Warming trend ↑2.683.72.01.710.00.00.00.00.00.01
0.0550.050.060.0554-0.547-0.614NormalNormalWarming trendNormal + Warming trend ↑4.757.02.91.611.80.00.020.81.20.01
0.1050.100.110.1254-0.750-0.972NormalNormalWarming trendNormal + Warming trend ↑5.162.412.95.911.50.60.01.60.00.01
0.1650.160.170.2095-0.819-1.153LowLow (≤Q10)Warming trendLow + Warming trend ↑6.970.06.24.710.90.20.00.90.20.01
0.2150.210.220.2928-0.717-0.902NormalNormalAlternating/neutralNormal + Alternating/neutral ↻5.866.214.58.93.30.00.01.20.00.01
0.2550.250.260.4551-0.638-0.755NormalNormalAlternating/neutralNormal + Alternating/neutral ↻5.660.716.310.94.50.20.01.80.00.01
0.3100.310.310.6579-0.766-1.010NormalNormalAlternating/neutralNormal + Alternating/neutral ↻11.370.46.64.16.30.20.00.90.20.01
0.3550.350.360.7796-0.473-0.514NormalNormalAlternating/neutralNormal + Alternating/neutral ↻7.052.120.915.64.00.00.00.40.00.01
0.4050.400.410.7796-0.753-0.980NormalNormalAlternating/neutralNormal + Alternating/neutral ↻4.570.210.911.43.00.00.00.00.00.01
0.4550.450.460.9572-0.661-0.795NormalNormalAlternating/neutralNormal + Alternating/neutral ↻3.061.320.912.51.90.00.00.30.00.01
0.5050.500.511.0706-0.773-1.027NormalNormalAlternating/neutralNormal + Alternating/neutral ↻2.968.911.98.35.20.00.22.50.00.01
0.5550.550.561.1840-0.877-1.361LowLow (≤Q10)Alternating/neutralLow + Alternating/neutral ↻1.578.69.37.33.00.00.30.00.00.01
0.6050.600.611.2974-0.619-0.723NormalNormalAlternating/neutralNormal + Alternating/neutral ↻12.856.914.73.49.70.00.02.50.00.01
0.6550.650.661.4107-0.612-0.713NormalNormalAlternating/neutralNormal + Alternating/neutral ↻5.257.418.512.86.00.00.00.00.00.01
0.7050.700.711.5241-0.777-1.039NormalNormalAlternating/neutralNormal + Alternating/neutral ↻4.167.511.69.17.70.00.00.00.00.01
0.7550.750.761.6375-0.669-0.808NormalNormalAlternating/neutralNormal + Alternating/neutral ↻6.560.814.310.87.60.00.00.00.00.01
0.8050.800.811.7509-0.795-1.084LowLow (≤Q10)Alternating/neutralLow + Alternating/neutral ↻7.471.09.86.15.60.00.00.00.00.01
0.8550.850.861.8700-0.503-0.553NormalNormalAlternating/neutralNormal + Alternating/neutral ↻18.555.514.04.24.80.00.02.90.00.01
0.9050.900.912.0414-0.474-0.516NormalNormalAlternating/neutralNormal + Alternating/neutral ↻6.651.415.610.98.60.00.06.90.00.01
0.9550.950.962.2128-0.447-0.481NormalNormalAlternating/neutralNormal + Alternating/neutral ↻2.446.821.414.110.60.00.04.70.00.01
1.0051.001.012.3842-0.644-0.765NormalNormalAlternating/neutralNormal + Alternating/neutral ↻13.262.611.44.25.40.00.03.30.00.01
1.0551.051.062.5557-0.436-0.468NormalNormalAlternating/neutralNormal + Alternating/neutral ↻7.349.118.611.18.10.00.05.80.00.01
1.1051.101.112.7271-0.317-0.328NormalNormalAlternating/neutralNormal + Alternating/neutral ↻7.143.826.610.64.80.00.07.10.00.01
1.1751.171.182.9670-0.630-0.741NormalNormalWarming trendNormal + Warming trend ↑3.257.820.19.75.40.00.03.70.00.01
1.2051.201.213.0699-0.758-0.992NormalNormalAlternating/neutralNormal + Alternating/neutral ↻4.666.910.17.38.10.00.03.00.00.01
1.2551.251.263.24130.5690.646NormalNormalWarming trendNormal + Warming trend ↑10.915.237.026.16.52.20.02.20.00.01
1.3051.301.313.41270.1870.189NormalNormalWarming trendNormal + Warming trend ↑17.026.635.614.43.70.00.02.70.00.02
1.3551.351.363.5841-0.439-0.471NormalNormalAlternating/neutralNormal + Alternating/neutral ↻7.546.519.814.511.70.00.00.00.00.02
1.4051.401.413.74940.9141.553NormalNormalAlternating/neutralNormal + Alternating/neutral ↻30.34.632.224.56.20.00.02.20.00.02
1.4551.451.463.8602-0.166-0.167NormalNormalAlternating/neutralNormal + Alternating/neutral ↻2.335.639.818.52.30.00.01.60.00.02
1.5051.501.513.9710-0.826-1.174LowLow (≤Q10)Alternating/neutralLow + Alternating/neutral ↻4.876.110.47.01.40.00.00.30.00.02
1.5551.551.564.08180.9662.028HighHigh (≥Q90)Cooling trendHigh + Cooling trend ↓32.82.330.726.95.70.00.01.50.00.02
1.6051.601.614.1926-0.830-1.187LowLow (≤Q10)Cooling trendLow + Cooling trend ↓5.174.59.24.94.30.00.01.90.00.02
1.6551.651.664.3034-0.166-0.168NormalNormalCooling trendNormal + Cooling trend ↓6.132.646.410.13.00.00.01.90.00.02
1.7051.701.714.4141-0.703-0.873NormalNormalCooling trendNormal + Cooling trend ↓7.565.616.85.21.70.00.03.20.00.02
1.7551.751.764.5249-0.862-1.302LowLow (≤Q10)Alternating/neutralLow + Alternating/neutral ↻4.278.09.25.82.80.00.00.00.00.02
1.8051.801.814.6357-0.372-0.390NormalNormalAlternating/neutralNormal + Alternating/neutral ↻6.549.020.818.72.90.00.02.10.00.03
1.8551.851.864.7465-0.124-0.124NormalNormalAlternating/neutralNormal + Alternating/neutral ↻5.537.629.021.13.20.00.03.50.00.03
1.9051.901.914.9494-0.637-0.753NormalNormalAlternating/neutralNormal + Alternating/neutral ↻7.661.515.77.43.70.00.04.10.00.03
1.9551.951.965.2443-0.829-1.183LowLow (≤Q10)Alternating/neutralLow + Alternating/neutral ↻15.376.71.00.66.40.00.00.00.00.03
2.0052.002.015.5392-0.426-0.454NormalNormalAlternating/neutralNormal + Alternating/neutral ↻9.851.120.915.52.80.00.00.00.00.03
2.0552.052.065.8342-0.342-0.357NormalNormalAlternating/neutralNormal + Alternating/neutral ↻5.548.223.119.10.90.00.23.10.00.03
2.1052.102.116.1291-0.407-0.432NormalNormalAlternating/neutralNormal + Alternating/neutral ↻6.249.725.516.50.80.00.01.30.00.03
2.1652.162.176.4830-0.494-0.541NormalNormalAlternating/neutralNormal + Alternating/neutral ↻5.951.021.913.46.40.00.01.50.00.03
2.2052.202.216.7190-0.039-0.039NormalNormalAlternating/neutralNormal + Alternating/neutral ↻15.433.237.611.41.40.00.00.90.00.03
2.2552.252.267.0139-0.514-0.567NormalNormalAlternating/neutralNormal + Alternating/neutral ↻8.554.419.413.83.90.00.00.00.00.03
2.3052.302.317.30880.1180.119NormalNormalAlternating/neutralNormal + Alternating/neutral ↻14.326.642.912.93.40.00.00.00.00.03
2.3552.352.367.57940.2650.272NormalNormalAlternating/neutralNormal + Alternating/neutral ↻13.125.731.226.42.90.00.00.70.00.03
2.4052.402.417.75270.5190.575NormalNormalWarming trendNormal + Warming trend ↑12.817.639.628.60.30.00.01.00.00.03
2.5052.502.517.89140.1280.129NormalNormalAlternating/neutralNormal + Alternating/neutral ↻16.131.724.825.81.50.00.00.00.00.03
2.5552.552.568.0648-0.110-0.110NormalNormalAlternating/neutralNormal + Alternating/neutral ↻5.234.937.718.22.00.00.02.00.00.03
2.6052.602.618.23820.7260.920NormalNormalAlternating/neutralNormal + Alternating/neutral ↻18.310.844.523.41.10.00.02.00.00.03
2.6552.652.668.41160.6060.702NormalNormalWarming trendNormal + Warming trend ↑23.016.624.933.31.90.00.00.30.00.03
2.7052.702.718.58500.4690.508NormalNormalWarming trendNormal + Warming trend ↑25.221.519.531.02.60.00.00.00.00.23
2.7552.752.768.75840.4570.494NormalNormalWarming trendNormal + Warming trend ↑20.523.311.941.11.80.00.01.30.20.03
2.8052.802.818.91690.7130.894NormalNormalWarming trendNormal + Warming trend ↑16.610.253.118.71.00.00.00.40.00.03
2.8552.852.869.01560.9171.569HighHigh (≥Q90)Alternating/neutralHigh + Alternating/neutral ↻34.95.027.432.00.60.00.00.00.00.03
2.9052.902.919.11430.9001.473NormalNormalAlternating/neutralNormal + Alternating/neutral ↻34.75.730.029.60.00.00.00.00.00.04
2.9552.952.969.21300.5770.657NormalNormalCooling trendNormal + Cooling trend ↓20.417.623.734.62.50.00.01.30.00.04
3.0053.003.019.31170.3770.397NormalNormalCooling trendNormal + Cooling trend ↓38.523.525.09.93.10.00.00.00.00.04
3.0553.053.069.41040.6900.848NormalNormalCooling trendNormal + Cooling trend ↓30.112.138.415.63.40.00.40.00.00.04
3.1053.103.119.50910.7100.887NormalNormalAlternating/neutralNormal + Alternating/neutral ↻18.612.828.037.31.90.00.01.40.00.04
3.1553.153.169.60780.2610.267NormalNormalWarming trendNormal + Warming trend ↑19.229.710.037.53.60.00.00.00.00.04
3.2053.203.219.70660.7050.877NormalNormalWarming trendNormal + Warming trend ↑14.313.320.243.24.20.00.24.40.20.04
3.2553.253.269.80530.7921.076NormalNormalWarming trendNormal + Warming trend ↑36.68.841.210.22.80.00.00.00.40.04
3.3053.303.319.90600.7961.087NormalNormalWarming trendNormal + Warming trend ↑46.18.838.63.13.50.00.00.00.00.04
3.3553.353.369.95350.9351.700HighHigh (≥Q90)Warming trendHigh + Warming trend ↑58.53.926.46.93.50.00.00.50.00.24
3.5053.503.5110.04840.9161.564NormalNormalWarming trendNormal + Warming trend ↑46.15.115.424.06.40.00.03.00.00.04
3.6053.603.6110.28570.9081.514NormalNormalWarming trendNormal + Warming trend ↑27.74.930.128.76.90.00.21.50.00.04
3.6553.653.6610.40430.9461.791HighHigh (≥Q90)Alternating/neutralHigh + Alternating/neutral ↻29.93.432.030.52.30.00.11.70.00.04
3.7053.703.7110.53390.9742.159HighHigh (≥Q90)Alternating/neutralHigh + Alternating/neutral ↻31.02.028.235.42.70.00.00.80.00.05
3.7553.753.7610.70690.9842.398HighHigh (≥Q90)Cooling trendHigh + Cooling trend ↓37.41.427.330.82.40.00.00.70.00.05
3.8053.803.8110.88000.9371.714HighHigh (≥Q90)Cooling trendHigh + Cooling trend ↓58.24.314.119.22.50.00.01.60.00.05
3.8553.853.8611.05310.9471.800HighHigh (≥Q90)Cooling trendHigh + Cooling trend ↓53.73.430.48.72.40.00.01.40.00.05
3.8953.893.9011.1915-0.563-0.638NormalNormalCooling trendNormal + Cooling trend ↓10.157.916.77.33.40.00.04.50.00.05
4.0054.004.0111.2607-0.613-0.713NormalNormalCooling trendNormal + Cooling trend ↓4.249.038.43.62.80.00.02.10.00.05
4.0554.054.0611.4338-0.205-0.208NormalNormalAlternating/neutralNormal + Alternating/neutral ↻7.535.235.710.67.90.00.03.00.00.05
4.1054.104.1111.6035-0.703-0.874NormalNormalWarming trendNormal + Warming trend ↑10.763.913.44.05.30.01.31.30.00.05
4.1604.154.1711.79160.0940.095NormalNormalWarming trendNormal + Warming trend ↑28.628.642.80.00.00.00.00.00.00.05
4.1804.174.1911.85430.7961.088NormalNormalWarming trendNormal + Warming trend ↑28.67.641.511.211.20.00.00.00.00.05