Haddam, Naoufel; Michel, Elisabeth; Siani, Giuseppe; Cortese, Giuseppe; Bostock, Helen C; Duprat, Josette M; Isguder, Gulay (2016): Compilation of planktonic foraminiferal census counts from the Southern Hemisphere Oceans [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.860938, Supplement to: Haddam, N et al. (2016): Improving past sea surface temperature reconstructions from the Southern Hemisphere oceans using planktonic foraminiferal census data. Paleoceanography, 31(6), 822-837, https://doi.org/10.1002/2016PA002946
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Abstract:
We present an improved database of planktonic foraminiferal census counts from the Southern Hemisphere Oceans (SHO) from 15°S to 64°S. The SHO database combines 3 existing databases. Using this SHO database, we investigated dissolution biases that might affect faunal census counts. We suggest a depth/[DCO3]2- threshold of ~3800 m/[DCO3]2- = ~-10 to -5 µmol/kg for the Pacific and Indian Oceans, and ~4000 m/[DCO3]2- = ~0 to 10 µmol/kg for the Atlantic Ocean, under which core-top assemblages can be affected by dissolution and are less reliable for paleo-sea surface temperature (SST) reconstructions. We removed all core-tops beyond these thresholds from the SHO database. This database has 598 core-tops and is able to reconstruct past SST variations from 2° to 25.5°C, with a root mean square error of 1.00°C, for annual temperatures. To inspect dissolution affects SST reconstruction quality, we tested the data base with two "leave-one-out" tests, with and without the deep core-tops.
We used this database to reconstruct Summer SST (SSST) over the last 20 ka, using the Modern Analog Technique method, on the Southeast Pacific core MD07-3100. This was compared to the SSST reconstructed using the 3 databases used to compile the SHO database. Thus showing that the reconstruction using the SHO database is more reliable, as its dissimilarity values are the lowest. The most important aspect here is the importance of a bias-free, geographic-rich, database. We leave this dataset open-ended to future additions; the new core-tops must be carefully selected, with their chronological frameworks, and evidence of dissolution assessed.
Related to:
Chen, Min-Te; Prell, Warren L (1998): Faunal distribution patterns of planktonic foraminifers in surface sediments of the low-latitude Pacific. Palaeogeography, Palaeoclimatology, Palaeoecology, 137(1-2), 55-77, https://doi.org/10.1016/S0031-0182(97)00095-3
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Coverage:
Median Latitude: -35.269953 * Median Longitude: 29.658934 * South-bound Latitude: -64.550000 * West-bound Longitude: -179.700000 * North-bound Latitude: 0.000000 * East-bound Longitude: 180.000000
Date/Time Start: 1874-06-13T00:00:00 * Date/Time End: 2012-02-13T00:00:00
Minimum Elevation: -5351.0 m * Maximum Elevation: 4996.0 m
Event(s):
7TOW-072 * Latitude: -20.240000 * Longitude: -176.460000 * Date/Time: 1970-05-16T00:00:00 * Elevation: -2730.0 m * Recovery: 166 cm * Location: South Pacific Ocean * Campaign: 7TOW_5 (7TOW05WT) * Basis: Thomas Washington
7TOW-105 * Latitude: -15.150000 * Longitude: -176.490000 * Date/Time: 1970-05-25T00:00:00 * Elevation: -2163.0 m * Recovery: 68 cm * Location: South Pacific Ocean * Campaign: 7TOW_5 (7TOW05WT) * Basis: Thomas Washington
90-594 * Latitude: -45.523500 * Longitude: 174.948000 * Date/Time: 1983-01-03T00:00:00 * Elevation: -1204.0 m * Penetration: 505.1 m * Recovery: 300.7 m * Location: South Pacific/CONT RISE * Campaign: Leg90 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 50 cores; 475.3 m cored; 28.8 m drilled; 63.3 % recovery
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
31420 data points
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