Unbekannt
PANGAEA
In:
Supplement to: Schmieder, Frank; von Dobeneck, Tilo; Bleil, Ulrich (2000): The Mid-Pleistocene climate transition as documented in the deep South Atlantic Ocean: initiation, interim state and terminal event. Earth and Planetary Science Letters, 179(3-4), 539-549, https://doi.org/10.1016/S0012-821X(00)00143-6
Publikationsdatum:
2024-02-02
Beschreibung:
The Mid-Pleistocene transition (MPT) of the global climate system, initiated by a shift towards much larger northern hemisphere ice shields at around 920 ka and ending with predominance of 100 kyr ice age cyclicity since about 640 ka, is one of the fundamental enigmas in Quaternary climate evolution. Climate proxy records not exclusively linked to global ice volume are necessary to advance understanding of the MPT. Here we present a high-resolution Pleistocene magnetic susceptibility time series of 12 sediment cores from the subtropical South Atlantic essentially reflecting dissolution driven variations in carbonate accumulation controlled by changes in deep water circulation. In addition to characteristics known from delta18O records, the data sets reveal three remarkable features intimately related to the MPT: (1) an all-Pleistocene minimum of carbonate accumulation in the South Atlantic at 920 ka, (2) a MPT interim state of reduced carbonate deposition, indicating that the MPT period may have been a discrete state of the Pleistocene deep water circulation and climate system and (3) a terminal MPT event at around 540-530 ka documented in several peculiarities such as thick laminated layers of the giant diatom Ethmodiscus rex.
Schlagwort(e):
06MT15_2; Angola Basin; Cape Basin; Eastern Rio Grande Rise; GeoB; GeoB1034-3; GeoB1035-4; GeoB1211-3; GeoB1309-2; GeoB1311-1; GeoB1729-3; GeoB2820-2; GeoB2821-1; GeoB3801-6; GeoB3812-1; GeoB3813-3; GeoB3814-6; Geosciences, University of Bremen; Gravity corer (Kiel type); Hunter Channel; M12/1; M15/2; M20/2; M29/2; M34/3; M6/6; Meteor (1986); Mid Atlantic Ridge; Namibia continental slope; RECON; Reconstructed data; Rio Grande Rise; SFB261; SL; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; SUSAS_Stack
Materialart:
Dataset
Format:
application/zip, 13 datasets
Permalink
|
Standort |
Signatur |
Einschränkungen |
Verfügbarkeit |
