Skip to content

Research at St Andrews

Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation

Research output: Contribution to journalArticle

DOI

Open Access permissions

Open

Author(s)

Ruza F. Ivanovic, Lauren J. Gregoire, Andrew D. Wickert, Paul J. Valdes, Andrea Burke

School/Research organisations

Abstract

Collapse of ice sheets can cause significant sea-level rise and widespread climate change. We examine the climatic response to meltwater generated by the collapse of the Cordilleran-Laurentide ice saddle (North America) ~14.5 thousand years ago (ka) using a high-resolution drainage model coupled to an ocean-atmosphere-vegetation General Circulation Model. Equivalent to 7.26 m global mean sea-level rise in 340 years, the meltwater caused a 6 Sv weakening of Atlantic Meridional Overturning Circulation (AMOC) and widespread Northern Hemisphere cooling of 1-5 °C. The greatest cooling is in the Atlantic-sector high latitudes during Boreal winter (by 5-10 °C), but there is also strong summer warming of 1-3 °C over eastern North America. Following recent suggestions that the Saddle Collapse was triggered by the Bølling Warming event ~14.7-14.5 ka, we conclude that this robust sub-millennial mechanism may have initiated the end of the warming and/or the Older Dryas cooling through a forced AMOC weakening.
Close

Details

Original languageEnglish
Pages (from-to)383-392
JournalGeophysical Research Letters
Volume44
Issue number1
Early online date9 Jan 2017
DOIs
Publication statusPublished - 16 Jan 2017

    Research areas

  • AMOC, Ice sheet melt, Saddle collapse, Older Dryas

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Stratospheric eruptions from tropical and extra-tropical volcanoes constrained using high-resolution sulfur isotopes in ice cores

    Burke, A., Moore, K. A., Sigl, M., Nita, D. C., McConnell, J. R. & Adkins, J. F., 1 Sep 2019, In : Earth and Planetary Science Letters. 521, p. 113-119 7 p.

    Research output: Contribution to journalArticle

  2. Improving North Atlantic marine core chronologies using 230Th-normalization

    Missiaen, L., Waelbroeck, C., Pichat, S., Jaccard, S. L., Eynaud, F., Greenop, R. & Burke, A., 10 Jul 2019, In : Paleoceanography and Paleoclimatology. 34, 17 p.

    Research output: Contribution to journalArticle

  3. CO2 storage and release in the deep Southern Ocean on millennial to centennial timescales

    Rae, J. W. B., Burke, A., Robinson, L. F., Adkins, J. F., Chen, T., Cole, C., Greenop, R., Li, T., Littley, E., Nita, D. C., Stewart, J. A. & Taylor, B., 25 Oct 2018, In : Nature. 562, p. 569-573 16 p.

    Research output: Contribution to journalLetter

  4. Sulfur isotopes in rivers: insights into global weathering budgets, pyrite oxidation, and the modern sulfur cycle

    Burke, A., Present, T. M., Paris, G., Rae, E. C. M., Sandilands, B. H., Gaillardet, J., Peucker-Ehrenbrink, B., Fischer, W. W., McClelland, J. W., Spencer, R. G. M., Voss, B. M. & Adkins, J. F., 15 Aug 2018, In : Earth and Planetary Science Letters. 496, p. 168-177 10 p.

    Research output: Contribution to journalArticle

  5. Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation

    Ivanovic, R., Gregoire, L., Burke, A., Wickert, A. D., Valdes, P. J., Ng, H. C., Robinson, L. F., McManus, J. F., Mitrovica, J. X., Lee, L. & Dentith, J. E., 27 Jul 2018, In : Paleoceanography and Paleoclimatology. Early View, 18 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Accelerated Volume Loss in Glacier Ablation Zones of NE Greenland, Little Ice Age to Present

    Carrivick, J. L., Boston, C. M., King, O., James, W. H. M., Quincey, D. J., Smith, M. W., Grimes, M. & Evans, J., 16 Feb 2019, In : Geophysical Research Letters. 46, 3, p. 1476-1484 9 p.

    Research output: Contribution to journalArticle

  2. Controls on the width of tropical precipitation and its contraction under global warming

    Donohoe, A., Atwood, A. R. & Byrne, M. P., 29 Aug 2019, In : Geophysical Research Letters. Early View, 10 p.

    Research output: Contribution to journalArticle

  3. Coupled modes of North Atlantic Ocean-atmosphere variability and the onset of the Little Ice Age

    Anchukaitis, K. J., Cook, E. R., Cook, B. I., Pearl, J. K., D'Arrigo, R. & Wilson, R., 7 Nov 2019, In : Geophysical Research Letters. Early View, 10 p.

    Research output: Contribution to journalArticle

  4. Discharge of meteoric water in the eastern Norwegian Sea since the last glacial period

    Hong, W-L., Lepland, A., Himmler, T., Kim, J-H., Chand, S., Sahy, D., Solomon, E. A., Rae, J. W. B., Martma, T., Nam, S-I. & Knies, J., 19 Jul 2019, In : Geophysical Research Letters. 46, 11 p.

    Research output: Contribution to journalArticle

  5. Effective rheology across the fragmentation transition for sea ice and ice shelves

    Åström, J. A. & Benn, D. I., 20 Nov 2019, In : Geophysical Research Letters. Early View

    Research output: Contribution to journalArticle

ID: 248480794

Top