Evidence for enhanced North Pacific Intermediate Water in the Bering Sea during extreme glacials over the past 1.2 Ma from records of stable isotopes analyzed at IODP Site 323-U1342 Holes A, C, and D ...
The Bering Strait provides a shallow connection that allows freshwater to flow from the North Pacific into the North Atlantic, but this passage was closed during past glacials when sea level was at least 50 m lower than at present. Climate models investigating Bering Strait closure predict that this...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
2017
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.876180 https://doi.pangaea.de/10.1594/PANGAEA.876180 |
| Summary: | The Bering Strait provides a shallow connection that allows freshwater to flow from the North Pacific into the North Atlantic, but this passage was closed during past glacials when sea level was at least 50 m lower than at present. Climate models investigating Bering Strait closure predict that this mechanism increases the salinity in the North Atlantic and reduces the salinity in the North Pacific, inducing a Pacific-Atlantic seesaw in meridional overturning circulation and poleward heat flux. However, the Pacific circulation response to Bering Strait closure, and thus the seesaw theory, has not been tested by long paleoceanographic records. We present long records of foraminiferal d18O and d13C from Integrated Ocean Drilling Program Site 323-U1342 in the Bering Sea, which provide the first evidence of enhanced North Pacific Intermediate Water when the Bering Strait was closed during each of the extreme glacials of the last 1.2 Myr. These results suggest that orbital-scale variations in North Pacific ... : Supplement to: Knudson, Karla P; Ravelo, Ana Christina (2015): North Pacific Intermediate Water circulation enhanced by the closure of the Bering Strait. Paleoceanography, 30(10), 1287-1304 ... |
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