Amplified North Atlantic warming in the late Pliocene by changes in Arctic gateways
Abstract
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. In conclusion, 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.
- Authors:
-
[1];
[2];
[1];
[1];
[1];
[1]
- National Center for Atmospheric Research, Boulder, CO (United States)
- Univ. of Colorado, Boulder, CO (United States)
- Publication Date:
- Research Org.:
- University Corporation For Atmospheric Research, Boulder, CO (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); USDOE
- OSTI Identifier:
- 1418511
- Grant/Contract Number:
- SC0012606
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 44; Journal Issue: 2; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Pliocene; climate modeling; Arctic
Citation Formats
Otto-Bliesner, Bette L., Jahn, Alexandra, Feng, Ran, Brady, Esther C., Hu, Aixue, and Lofverstrom, Marcus. Amplified North Atlantic warming in the late Pliocene by changes in Arctic gateways. United States: N. p., 2016.
Web. doi:10.1002/2016GL071805.
Otto-Bliesner, Bette L., Jahn, Alexandra, Feng, Ran, Brady, Esther C., Hu, Aixue, & Lofverstrom, Marcus. Amplified North Atlantic warming in the late Pliocene by changes in Arctic gateways. United States. https://doi.org/10.1002/2016GL071805
Otto-Bliesner, Bette L., Jahn, Alexandra, Feng, Ran, Brady, Esther C., Hu, Aixue, and Lofverstrom, Marcus. Mon .
"Amplified North Atlantic warming in the late Pliocene by changes in Arctic gateways". United States. https://doi.org/10.1002/2016GL071805. https://www.osti.gov/servlets/purl/1418511.
@article{osti_1418511,
title = {Amplified North Atlantic warming in the late Pliocene by changes in Arctic gateways},
author = {Otto-Bliesner, Bette L. and Jahn, Alexandra and Feng, Ran and Brady, Esther C. and Hu, Aixue and Lofverstrom, Marcus},
abstractNote = {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. In conclusion, 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},
journal = {Geophysical Research Letters},
number = 2,
volume = 44,
place = {United States},
year = {Mon Dec 26 00:00:00 EST 2016},
month = {Mon Dec 26 00:00:00 EST 2016}
}
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Fig. 1.: Final event rate distributions for the number of DOMs registering hits during the event (left) and the cosine of the reconstructed event zenith in detector coordinates (right). The solid line describes the final level dataset while the black points represent the sum of the various simulated species. Binsmore »
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Figures / Tables found in this record:
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