Biological and Environmental Research - Earth and Environmental System Sciences
Earth and Environmental System Modeling

Amplified North Atlantic Warming in the Late Pliocene by Changes in Arctic Gateways

TitleAmplified North Atlantic Warming in the Late Pliocene by Changes in Arctic Gateways
Publication TypeJournal Article
Year of Publication2017
AuthorsOtto-Bliesner, Bette L., Jahn Alexandra, Feng Ran, Brady Esther C., Hu Aixue, and Lofverstrom Marcus
JournalGeophysical Research Letters
Volume44
Number2
Pages957-964
Abstract / Summary

Under previous reconstructions of late Pliocene boundary conditions, climate models have failed to reproduce the warm sea surface temperatures reconstructed in the North Atlantic. Using a reconstruction of mid‐Piacenzian paleogeography that has the Bering Strait and Canadian Arctic Archipelago Straits closed, however, improves the simulation of the proxy‐indicated warm sea surface temperatures in the North Atlantic in the Community Climate System Model. We find that the closure of these small Arctic gateways strengthens the Atlantic Meridional Overturning Circulation, by inhibiting freshwater transport from the Pacific to the Arctic Ocean and from the Arctic Ocean to the Labrador Sea, leading to warmer sea surface temperatures in the North Atlantic. This indicates that the state of the Arctic gateways may influence the sensitivity of the North Atlantic climate in complex ways, and better understanding of the state of these Arctic gateways for past time periods is needed.

URLhttps://doi.org/10.1002/2016gl071805
DOI10.1002/2016gl071805
Journal: Geophysical Research Letters
Year of Publication: 2017
Volume: 44
Number: 2
Pages: 957-964
Publication Date: 01/2017

Under previous reconstructions of late Pliocene boundary conditions, climate models have failed to reproduce the warm sea surface temperatures reconstructed in the North Atlantic. Using a reconstruction of mid‐Piacenzian paleogeography that has the Bering Strait and Canadian Arctic Archipelago Straits closed, however, improves the simulation of the proxy‐indicated warm sea surface temperatures in the North Atlantic in the Community Climate System Model. We find that the closure of these small Arctic gateways strengthens the Atlantic Meridional Overturning Circulation, by inhibiting freshwater transport from the Pacific to the Arctic Ocean and from the Arctic Ocean to the Labrador Sea, leading to warmer sea surface temperatures in the North Atlantic. This indicates that the state of the Arctic gateways may influence the sensitivity of the North Atlantic climate in complex ways, and better understanding of the state of these Arctic gateways for past time periods is needed.

DOI: 10.1002/2016gl071805
Citation:
Otto-Bliesner, BL, A Jahn, R Feng, EC Brady, A Hu, and M Löfverström.  2017.  "Amplified North Atlantic Warming in the Late Pliocene by Changes in Arctic Gateways."  Geophysical Research Letters 44(2): 957-964.  https://doi.org/10.1002/2016gl071805.