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North Atlantic meltwater during Heinrich Stadial 1 drives wetter climate with more atmospheric rivers in western North America

Atmospheric rivers (ARs) bring concentrated rainfall and flooding to the western United States (US) and are hypothesized to have supported sustained hydroclimatic changes in the past. However, their ephemeral nature makes it challenging to document ARs in climate models and estimate their contributi...

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Autores principales: Oster, Jessica L., Macarewich, Sophia, Lofverstrom, Marcus, de Wet, Cameron, Montañez, Isabel, Lora, Juan M., Skinner, Christopher, Tabor, Clay
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10656076/
https://www.ncbi.nlm.nih.gov/pubmed/37976349
http://dx.doi.org/10.1126/sciadv.adj2225
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author Oster, Jessica L.
Macarewich, Sophia
Lofverstrom, Marcus
de Wet, Cameron
Montañez, Isabel
Lora, Juan M.
Skinner, Christopher
Tabor, Clay
author_facet Oster, Jessica L.
Macarewich, Sophia
Lofverstrom, Marcus
de Wet, Cameron
Montañez, Isabel
Lora, Juan M.
Skinner, Christopher
Tabor, Clay
author_sort Oster, Jessica L.
collection PubMed
description Atmospheric rivers (ARs) bring concentrated rainfall and flooding to the western United States (US) and are hypothesized to have supported sustained hydroclimatic changes in the past. However, their ephemeral nature makes it challenging to document ARs in climate models and estimate their contribution to hydroclimate changes recorded by time-averaged paleoclimate archives. We present new climate model simulations of Heinrich Stadial 1 (HS1; 16,000 years before the present), an interval characterized by widespread wetness in the western US, that demonstrate increased AR frequency and winter precipitation sourced from the southeastern North Pacific. These changes are amplified with freshwater fluxes into the North Atlantic, indicating that North Atlantic cooling associated with weakened Atlantic Meridional Overturning Circulation (AMOC) is a key driver of HS1 climate in this region. As recent observations suggest potential weakening of AMOC, our identified connection between North Atlantic climate and northeast Pacific AR activity has implications for future western US hydroclimate.
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spelling pubmed-106560762023-11-17 North Atlantic meltwater during Heinrich Stadial 1 drives wetter climate with more atmospheric rivers in western North America Oster, Jessica L. Macarewich, Sophia Lofverstrom, Marcus de Wet, Cameron Montañez, Isabel Lora, Juan M. Skinner, Christopher Tabor, Clay Sci Adv Earth, Environmental, Ecological, and Space Sciences Atmospheric rivers (ARs) bring concentrated rainfall and flooding to the western United States (US) and are hypothesized to have supported sustained hydroclimatic changes in the past. However, their ephemeral nature makes it challenging to document ARs in climate models and estimate their contribution to hydroclimate changes recorded by time-averaged paleoclimate archives. We present new climate model simulations of Heinrich Stadial 1 (HS1; 16,000 years before the present), an interval characterized by widespread wetness in the western US, that demonstrate increased AR frequency and winter precipitation sourced from the southeastern North Pacific. These changes are amplified with freshwater fluxes into the North Atlantic, indicating that North Atlantic cooling associated with weakened Atlantic Meridional Overturning Circulation (AMOC) is a key driver of HS1 climate in this region. As recent observations suggest potential weakening of AMOC, our identified connection between North Atlantic climate and northeast Pacific AR activity has implications for future western US hydroclimate. American Association for the Advancement of Science 2023-11-17 /pmc/articles/PMC10656076/ /pubmed/37976349 http://dx.doi.org/10.1126/sciadv.adj2225 Text en Copyright © 2023 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Earth, Environmental, Ecological, and Space Sciences
Oster, Jessica L.
Macarewich, Sophia
Lofverstrom, Marcus
de Wet, Cameron
Montañez, Isabel
Lora, Juan M.
Skinner, Christopher
Tabor, Clay
North Atlantic meltwater during Heinrich Stadial 1 drives wetter climate with more atmospheric rivers in western North America
title North Atlantic meltwater during Heinrich Stadial 1 drives wetter climate with more atmospheric rivers in western North America
title_full North Atlantic meltwater during Heinrich Stadial 1 drives wetter climate with more atmospheric rivers in western North America
title_fullStr North Atlantic meltwater during Heinrich Stadial 1 drives wetter climate with more atmospheric rivers in western North America
title_full_unstemmed North Atlantic meltwater during Heinrich Stadial 1 drives wetter climate with more atmospheric rivers in western North America
title_short North Atlantic meltwater during Heinrich Stadial 1 drives wetter climate with more atmospheric rivers in western North America
title_sort north atlantic meltwater during heinrich stadial 1 drives wetter climate with more atmospheric rivers in western north america
topic Earth, Environmental, Ecological, and Space Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10656076/
https://www.ncbi.nlm.nih.gov/pubmed/37976349
http://dx.doi.org/10.1126/sciadv.adj2225
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