Rapid changes in meridional advection of Southern Ocean intermediate waters to the tropical Pacific during the last 30 kyr ...
The Southern Ocean is increasingly recognized as a key player in the general ocean thermohaline circulation and the global climate system during glacial–interglacial transitions. In particular, the advection of Southern Ocean intermediate waters (SOIW), like Antarctic Intermediate Water and Sub-Anta...
| Main Authors: | , , , , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | unknown |
| Published: |
Columbia University
2013
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.7916/d8tb1hxm https://academiccommons.columbia.edu/doi/10.7916/D8TB1HXM |
| Summary: | The Southern Ocean is increasingly recognized as a key player in the general ocean thermohaline circulation and the global climate system during glacial–interglacial transitions. In particular, the advection of Southern Ocean intermediate waters (SOIW), like Antarctic Intermediate Water and Sub-Antarctic Mode Water, to the Eastern Equatorial Pacific (EEP), through a so-called “oceanic tunnelling” mechanism, is an important means for rapid transfer of climatic signals (such as heat, fresh water, salt, and chemical species) from high-to-low latitudes. However, information on how intermediate water advection rates changed in the past, and particularly during deglaciations, is fragmentary. We present new results for Nd isotopes (εNd) in cleaned foraminifera shells (Neogloboquadrina dutertrei) for the last 30 kyr at ODP Site 1240 in the EEP. N. dutertrei preferentially dwells in the lower thermocline, at the core of the Equatorial Undercurrent (EUC), and the εNd variability over time provides a record of the ... |
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