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

• Main Authors: Bartoli, Gretta, Sarnthein, Michael, Weinelt, Mara, Erlenkeuser, Helmut, Garbe-Schönberg, Dieter, Lea, David W
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2005
• Subjects: Drilling/drill rig; Leg94; Leg162; Glomar Challenger; Joides Resolution; Deep Sea Drilling Project DSDP; Impact of Gateways on Ocean Circulation, Climate, and Evolution OceanGateways; Ocean Drilling Program ODP; Arctic; Greenland; Mara; Ice Sheet; North Atlantic; North atlantic Thermohaline circulation
• Online Access: https://dx.doi.org/10.1594/pangaea.484677; https://doi.pangaea.de/10.1594/PANGAEA.484677

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 ... : Supplement to: Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara; Erlenkeuser, Helmut; Garbe-Schönberg, Dieter; Lea, David W (2005): Final closure of Panama and the onset of northern hemisphere glaciation. Earth and Planetary Science Letters, 237, 33-44 ...