Haug, Gerald H.; Tiedemann, Ralf; Zahn, Rainer; Ravelo, A. Christina (2001): Role of Panama uplift on oceanic freshwater balance. Geological Society of America (GSA), Boulder, CO, United States, Geology (Boulder), 29 (3), 207-210, georefid:2001-021643

Comparison between planktic foraminiferal oxygen isotope records from the Caribbean Sea (Ocean Drilling Program [ODP] Site 999) and the equatorial east Pacific (ODP Site 851) suggests an increase in Caribbean surface-water salinity between 4.7 and 4.2 Ma. The modern Atlantic-Pacific salinity contrast of about 1 per mil became fully established at 4.2 Ma as reflected by a 0.5 per mil planktic foraminifera (super 18) O enrichment in the Caribbean Sea. This is interpreted as the result of restricted surface-water exchange between the tropical Atlantic and Pacific in response to the shoaling of the Central American seaway. As a consequence, the Atlantic and Pacific surface-ocean circulation regime changed, as did the freshwater balance between the major ocean basins. Simultaneous shifts in benthic carbon isotope records in the Caribbean Sea suggest an intensification in North Atlantic thermohaline circulation. These results indicate that the Panamanian isthmus formation caused several new ocean-atmosphere feedback mechanisms that have affected climate since the early Pliocene.
West: -110.3419 East: -78.4422 North: 12.4437 South: 2.4612
Expedition: 138
Site: 138-851
Expedition: 165
Site: 165-999
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=2001-021643 (c.f. for more detailed metadata)
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