Smith, Yvonne M; Hill, Daniel J; Dolan, Aisling M; Haywood, Alan M; Dowsett, Harry J: Late Pliocene Presence / Absence of IRD in the North Atlantic [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.896709 (dataset in review), Supplement to: Smith, YM et al. (submitted): Determining Northern Hemisphere Ice Sheets in the Late Pliocene using Iceberg Trajectory Modelling.
Abstract:
The late Pliocene was the most recent time in Earth's history to have greater than Pre-Industrial atmospheric concentrations of CO2 and global mean annual temperatures, similar to climate model predictions for the end of this century, and smaller than modern ice sheets. The nature of Northern Hemisphere ice sheets during this period remains poorly constrained. For the first time, we combine outputs derived from a climate model with a thermodynamic iceberg model in order to decipher source regions of ice rafted debris (IRD) found in sediment cores from the North Atlantic Ocean in order to elucidate the nature of ice sheet variability during the late Pliocene. Specifically, we compare the geographical extent of iceberg melt predicted using four scenarios of late Pliocene Northern Hemisphere ice volume (three representing different glacial scenarios approximating Marine Isotope Stage (MIS) M2, and one representing a typical interglacial condition within the mid-Piacenzian Warm Period (mPWP)) with IRD data from core sites in the North Atlantic. Our results suggest ice volume during MIS M2 was greater than during the Pre-Industrial era but less than has been previously suggested. In addition, marine-terminating glaciers were still present during the mPWP. Iceberg model trajectories suggest East Greenland as a potential source of icebergs in accordance with the presence/absence of IRD at sediment core sites within the Labrador Sea. Other potential source regions are also suggested by the model, such as West Greenland and East Canada, and could be differentiated by geochemical provenance testing of late Pliocene North Atlantic IRD.
Related to:
Berggren, William A (1972): Cenozoic biostratigraphy and paleobiogeography of the North Atlantic. Initial Reports of the Deep Sea Drilling Project 12, 965-1001
Blake-Mizen, Keziah; Hatfield, Robert George; Stoner, Joseph S; Carlson, Anders Eskil; Xuan, Chuang; Walczak, Maureen H; Lawrence, Kira T; Channell, James E T; Bailey, Ian (2019): Southern Greenland glaciation and Western Boundary Undercurrent evolution recorded on Eirik Drift during the late Pliocene intensification of Northern Hemisphere glaciation. Quaternary Science Reviews, 209, 40-51, https://doi.org/10.1016/j.quascirev.2019.01.015
De Schepper, Stijn; Head, Martin J; Groeneveld, Jeroen (2009): North Atlantic Current variability through marine isotope stage M2 (circa 3.3 Ma) during the mid-Pliocene. Paleoceanography, 24(4), https://doi.org/10.1029/2008PA001725
Dowsett, Harry J (1989): Application of the graphic correlation method to Pliocene marine sequences. Marine Micropaleontology, 14, 3-32
Dowsett, Harry J; Poore, Richard Z (1990): A new planktic foraminifer transfer function for estimating Pliocene - Holocene Sea Surface temperatures. Marine Micropaleontology, 16(1-2), 1-23, https://doi.org/10.1016/0377-8398(90)90026-I
Draut, Amy E; Raymo, Maureen E; McManus, Jerry F; Oppo, Delia W (2003): Climate stability during the Pliocene warm period. Paleoceanography, 18(4), https://doi.org/10.1029/2003PA000889
Khélifi, Nabil; Sarnthein, Michael; Naafs, Bernhard David A (2012): Technical note: Late Pliocene age control and composite depths at ODP Site 982, revisited. Climate of the Past, 8(1), 79-87, https://doi.org/10.5194/cp-8-79-2012
Naafs, Bernhard David A; Hefter, Jens; Acton, Gary D; Haug, Gerald H; Martínez‐García, Alfredo; Pancost, Richard D; Stein, Ruediger (2012): Strengthening of North American dust sources during the late Pliocene (2.7 Ma). Earth and Planetary Science Letters, 317-318, 8-19, https://doi.org/10.1016/j.epsl.2011.11.026
Project(s):
Coverage:
Median Latitude: 49.401635 * Median Longitude: -27.656348 * South-bound Latitude: 37.338700 * West-bound Longitude: -46.400550 * North-bound Latitude: 58.505783 * East-bound Longitude: -14.650800
Date/Time Start: 1970-06-25T00:00:00 * Date/Time End: 1995-07-19T02:25:00
Minimum DEPTH, sediment/rock: 46.410 m * Maximum DEPTH, sediment/rock: 262.290 m
Event(s):
12-111A * Latitude: 50.426200 * Longitude: -46.367500 * Date/Time: 1970-06-25T00:00:00 * Elevation: -1797.0 m * Penetration: 199 m * Recovery: 60.6 m * Location: North Atlantic/KNOLL * Campaign: Leg12 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 12 cores; 94 m cored; 0 m drilled; 64.5 % recovery
81-552A * Latitude: 56.042700 * Longitude: -23.231300 * Date/Time: 1981-07-31T00:00:00 * Elevation: -2301.0 m * Penetration: 183.5 m * Recovery: 182.3 m * Location: North Atlantic/PLATEAU * Campaign: Leg81 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 183.5 m cored; 0 m drilled; 99.4 % recovery
94-606 * Latitude: 37.338700 * Longitude: -35.499800 * Date/Time: 1983-07-02T00:00:00 * Elevation: -3007.0 m * Penetration: 165.7 m * Recovery: 154.1 m * Location: North Atlantic/FLANK * Campaign: Leg94 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 165.7 m cored; 0 m drilled; 93 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Smith, Yvonne M | |||
| 2 | Sample code/label | Sample label | Smith, Yvonne M | DSDP/ODP/IODP sample designation | ||
| 3 | Section position | Sect | cm | Smith, Yvonne M | Depth in Section (Center) | |
| 4 | DEPTH, sediment/rock | Depth sed | m | Smith, Yvonne M | Geocode – mbsf | |
| 5 | Ice rafted debris | IRD | Smith, Yvonne M | 0 = absent, 1 = present | ||
| 6 | AGE | Age | ka BP | Smith, Yvonne M | Geocode | |
| 7 | Reference/source | Reference | Smith, Yvonne M | of age model |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Size:
1892 data points