Abstract
Subsurface water masses formed at high latitudes impact the latitudinal distribution of heat in the ocean. Yet uncertainty surrounding the timing of low-latitude warming during the last deglaciation (18–10 ka) means that controls on sub-surface temperature rise remain unclear. Here we present seawater temperature records on a precise common age-scale from East Equatorial Pacific (EEP), Equatorial Atlantic, and Southern Ocean intermediate waters using new Li/Mg records from cold water corals. We find coeval warming in the tropical EEP and Atlantic during Heinrich Stadial 1 (+ 6 °C) that closely resemble warming recorded in Antarctic ice cores, with more modest warming of the Southern Ocean (+ 3 °C). The magnitude and depth of low-latitude ocean warming implies that downward accumulation of heat following Atlantic Meridional Overturning Circulation (AMOC) slowdown played a key role in heating the ocean interior, with heat advection from southern-sourced intermediate waters playing an additional role.
| Original language | English |
|---|---|
| Article number | 22410 |
| Journal | Scientific Reports |
| Volume | 13 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 16 Dec 2023 |
Bibliographical note
Funding Information:The authors declare that they have no competing interests. We gratefully acknowledge the crew and researchers onboard the research cruises who obtained the samples used in this study. Cruises MV1007 and NA064 were funded by the National Science Foundation and Ocean Exploration Trust respectively. We thank the Charles Darwin Research Foundation, Galápagos National Park, and INOCAR for permission to collect mapping data and samples from the Galápagos area. We thank C. Coath, C. Taylor, S. Mitchell, A. Samperiz-Vizcaino, R. Greenop, E. Littley, and J. Crumpton-Banks for their help with laboratory work. Funding was provided by an Antarctic Bursary awarded to J.A.S., ERC and NERC grants awarded to L.F.R. (278705, NE/S001743/1, NE/R005117/1) and L.F.R. and J.W.B.R. (NE/N003861/1). J.A.S. and M.L.d.C.F. collected the geochemical data. Samples were provided by L.F.R. and D.J.F. Field work associated with the MV1007 cruise was supported by NSF grant OCE-0926637 and OCE-1030904 to D.J.F. and Karen Harpp (Colgate U.). We thank the editor and two anonymous reviewers for their suggestions that improved this article.
Funding Information:
The authors declare that they have no competing interests. We gratefully acknowledge the crew and researchers onboard the research cruises who obtained the samples used in this study. Cruises MV1007 and NA064 were funded by the National Science Foundation and Ocean Exploration Trust respectively. We thank the Charles Darwin Research Foundation, Galápagos National Park, and INOCAR for permission to collect mapping data and samples from the Galápagos area. We thank C. Coath, C. Taylor, S. Mitchell, A. Samperiz-Vizcaino, R. Greenop, E. Littley, and J. Crumpton-Banks for their help with laboratory work. Funding was provided by an Antarctic Bursary awarded to J.A.S., ERC and NERC grants awarded to L.F.R. (278705, NE/S001743/1, NE/R005117/1) and L.F.R. and J.W.B.R. (NE/N003861/1). J.A.S. and M.L.d.C.F. collected the geochemical data. Samples were provided by L.F.R. and D.J.F. Field work associated with the MV1007 cruise was supported by NSF grant OCE-0926637 and OCE-1030904 to D.J.F. and Karen Harpp (Colgate U.). We thank the editor and two anonymous reviewers for their suggestions that improved this article.
Publisher Copyright:
© 2023, The Author(s).