Nürnberg, Dirk; Gehre, Nadine; Fessler, Sebastian (2025): Sand, calcium carbonate, coarse carbonate, and biogenic silica concentrations in core M78/1_181-3 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.975177 (DOI registration in progress)
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Published: 2025-02-17
Abstract:
The Mississippi River discharge effectively shaped the dynamics of the Loop Current in the Gulf of Mexico during transient climates and interglacials, and reacted in response to changes in sea level and atmospheric circulation. We here provide proxydata records from piston core M78/1-181-3 PC. The ~12 m-long core was recovered from the Mississippi Alabama shelf very close to and southeast of the recent Mississippi delta (29°00.00'N 88°20.00'W) from 804 m water depth during R/V Meteor Cruise M78/1 in 2009 (doi:10.2312/cr_m78_1). The proxyrecords cover the last ~42 kyrs at centennial resolution. This dataset contains sand (>63 µm), bulk CaCO3, calculated coarse carbonate and biogenic silica percentages. Sampling and analytical studies were carried out from 3 cm to ~1220 cm core depth at ~5 cm spatial resolution. Total inorganic carbon (TIC), which is a reflection of CaCO3 (CaCO3 = TIC ⁎ 8.333), was calculated as the difference between total carbon (TC) – measured on bulk sediment material – and total organic carbon (TOC) – measured on de-calcified sediment samples via Carlo-Erba NA-1500 Elemental Analyzer at GEOMAR. Percentages of coarse carbonate were calculated to assess varying abundances in foraminifers. Biogenic silica (opal) was measured via an automatic extraction analysis at GEOMAR.
Related to:
Kujau, Ariane; Nürnberg, Dirk; Zielhofer, Christoph; Bahr, André; Röhl, Ursula (2010): Mississippi River discharge over the last ~560,000 years -- Indications from X-ray fluorescence core-scanning. Palaeogeography, Palaeoclimatology, Palaeoecology, 298, 311-318, https://doi.org/10.1016/j.palaeo.2010.10.005
Nürnberg, Dirk; Bahr, André; Mildner, Tanja; Eden, Carsten (2015): Loop Current Variability—Its Relation to Meridional Overturning Circulation and the Impact of Mississippi Discharge. In: Schulz, M, Paul, A (eds.), Integrated Analysis of Interglacial Climate Dynamics (INTERDYNAMIC), SpringerBriefs in Earth System Sciences, Springer International Publishing, Cham, 55-62, https://doi.org/10.1007/978-3-319-00693-2_10
Nürnberg, Dirk; Ziegler, Martin; Karas, Cyrus; Tiedemann, Ralf; Schmidt, Matthew W (2008): Interacting Loop Current variability and Mississippi River discharge over the past 400 kyr. Earth and Planetary Science Letters, 272(1-2), 278-289, https://doi.org/10.1016/j.epsl.2008.04.051
Ziegler, Martin; Nürnberg, Dirk; Karas, Cyrus; Tiedemann, Ralf; Lourens, Lucas Joost (2008): Persistent summer expansion of the Atlantic Warm Pool during glacial abrupt cold events. Nature Geoscience, 1, 601-605, https://doi.org/10.1038/ngeo277
Project(s):
Integrierte Analyse zwischeneiszeitlicher Klimadynamik (INTERDYNAMIK)
Funding:
German Research Foundation (DFG), grant/award no. 25575884: Integrierte Analyse zwischeneiszeitlicher Klimadynamik
Coverage:
Latitude: 29.000000 * Longitude: -88.333333
Date/Time Start: 2009-03-04T11:58:00 * Date/Time End: 2009-03-04T11:58:00
Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 12.18 m
Event(s):
M78/1_181-3 (181-3) * Latitude: 29.000000 * Longitude: -88.333333 * Date/Time: 2009-03-04T11:58:00 * Elevation: -803.5 m * IGSN: doi:10.58031/KIEL0156GERK101 * Location: Mississippi Profile Station 1 * Campaign: M78/1 * Basis: Meteor (1986) * Method/Device: Piston corer (PC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Nürnberg, Dirk | Geocode | |
| 2 | AGE | Age | ka BP | Nürnberg, Dirk | Geocode – Method: Nürnberg et al., 2015 | |
| 3 | Size fraction > 0.063 mm, sand | >63 µm | % | Nürnberg, Dirk | Wet sieving | |
| 4 | Calcium carbonate | CaCO3 | % | Nürnberg, Dirk | ||
| 5 | Calcium carbonate, coarse fraction > 63 µm | CaCO3 >63 µm | % | Nürnberg, Dirk | Calculated | |
| 6 | Opal, biogenic silica | bSiO2 | % | Nürnberg, Dirk | Opal, auto analysis (Müller & Schneider, 1993) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
720 data points