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Stable isotope analysis and temperature reconstruction data from DSDP Hole 94-609B and ODP Hole 162-984B

The Greenland ice sheet is accepted as a key factor controlling the Quaternary glacial scenario. However, the origin and mechanisms of major Arctic glaciation starting at 3.15 Ma and culminating at 2.74 Ma are still controversial. For this phase of intense cooling Ravelo et al. proposed a complex gradual forcing mechanism. In contrast, our new submillennial-scale paleoceanographic records from the Pliocene North Atlantic suggest a far more precise timing and forcing for the initiation of northern hemisphere glaciation (NHG), since it was linked to a 2-3 °C surface water warming during warm stages from 2.95 to 2.82 Ma. These records support previous models, claiming that the final closure of the Panama Isthmus (3.0- ~2.5 Ma induced an increased poleward salt and heat transport. Associated strengthening of North Atlantic Thermohaline Circulation and in turn, an intensified moisture supply to northern high latitudes resulted in the build-up of NHG, finally culminating in the great, irreversible climate crash at marine isotope stage G6 (2.74 Ma). In summary, there was a two-step threshold mechanism that marked the onset of NHG with glacial-to-interglacial cycles quasi-persistent until today.

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Cite this as

Bartoli, Gretta, Sarnthein, Michael, Weinelt, Mara, Erlenkeuser, Helmut, Garbe-Schönberg, Dieter, Lea, David W (2005). Dataset: Stable isotope analysis and temperature reconstruction data from DSDP Hole 94-609B and ODP Hole 162-984B. https://doi.org/10.1594/PANGAEA.484677

DOI retrieved: 2005

Additional Info

Field Value
Imported on November 29, 2024
Last update November 29, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.484677
Author Bartoli, Gretta
Given Name Gretta
Family Name Bartoli
More Authors
Sarnthein, Michael
Weinelt, Mara
Erlenkeuser, Helmut
Garbe-Schönberg, Dieter
Lea, David W
Source Creation 2005
Publication Year 2005
Resource Type application/zip - filename: Bartoli-etal_2005
Subject Areas
Name: Geophysics

Related Identifiers
Title: Final closure of Panama and the onset of northern hemisphere glaciation
Identifier: https://doi.org/10.1016/j.epsl.2005.06.020
Type: DOI
Relation: IsSupplementTo
Year: 2005
Source: Earth and Planetary Science Letters
Authors: Bartoli Gretta , Sarnthein Michael , Weinelt Mara , Erlenkeuser Helmut , Garbe-Schönberg Dieter , Lea David W .