Subsurface heat channel drove sea surface warming in the high-latitude North Atlantic during the mid-pleistocene transition
The Mid-Pleistocene Transition (MPT, 1,200-600 ka) marks the rapid expansion of Northern Hemisphere (NH) continental ice sheets and stronger precession pacing of glacial/interglacial cyclicity. Here, we investigate the relationship between thermocline depth in the central North Atlantic, subsurface...
Gespeichert in:
| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
1 June 2021
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| In: |
Geophysical research letters
Year: 2021, Jahrgang: 48, Heft: 11, Pages: 1-12 |
| ISSN: | 1944-8007 |
| DOI: | 10.1029/2020GL091899 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1029/2020GL091899 Verlag, kostenfrei, Volltext: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020GL091899 
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| Verfasserangaben: | M. Carolina A. Catunda, André Bahr, Stefanie Kaboth-Bahr, Xu Zhang, Nicholas P. Foukal, and Oliver Friedrich |
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| 520 | |a The Mid-Pleistocene Transition (MPT, 1,200-600 ka) marks the rapid expansion of Northern Hemisphere (NH) continental ice sheets and stronger precession pacing of glacial/interglacial cyclicity. Here, we investigate the relationship between thermocline depth in the central North Atlantic, subsurface northward heat transport and the initiation of the 100-kyr cyclicity during the MPT. To reconstruct deep-thermocline temperatures, we generated a Mg/Ca-based temperature record of deep-dwelling (∼800 m) planktonic foraminifera from mid-latitude North Atlantic at Site U1313. This record shows phases of pronounced heat accumulation at subsurface levels during the mid-MPT glacial driven by increased outflow of the Mediterranean Sea. Concurrent warming of the subtropical thermocline and subpolar surface waters indicates enhanced (subsurface) inter-gyre transport of warm water to the subpolar North Atlantic, which provided moisture for ice-sheet growth. Precession-modulated variability in the northward transport of subtropical waters imprinted this orbital cyclicity into NH ice-sheets after Marine Isotope Stage 24. | ||
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| 650 | 4 | |a mid-Pleistocene transition | |
| 650 | 4 | |a North Atlantic gyres | |
| 650 | 4 | |a paleoceanography | |
| 650 | 4 | |a subsurface heat transport | |
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