Western U.S. lake expansions during Heinrich stadials linked to Pacific Hadley circulation
McGee, D. (Massachusetts Institute of Technology. Department of Earth, Atmospheric and Planetary Sciences)
Moreno-Chamarro, E. (Massachusetts Institute of Technology. Department of Earth, Atmospheric and Planetary Sciences)
Marshall, J. (Massachusetts Institute of Technology. Department of Earth, Atmospheric and Planetary Sciences)
Galbraith, Eric (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Universitat Autònoma de Barcelona. Departament de Matemàtiques

Data:	2018
Resum:	Lake and cave records show that winter precipitation in the southwestern United States increased substantially during millennial-scale periods of Northern Hemisphere winter cooling known as Heinrich stadials. However, previous work has not produced a clear picture of the atmospheric circulation changes driving these precipitation increases. Here, we combine data with model simulations to show that maximum winter precipitation anomalies were related to an intensified subtropical jet and a deepened, southeastward-shifted Aleutian Low, which together increased atmospheric river-like transport of subtropical moisture into the western United States. The jet and Aleutian Low changes are tied to the southward displacement of the intertropical convergence zone and the accompanying intensification of the Hadley circulation in the central Pacific. These results refine our understanding of atmospheric changes accompanying Heinrich stadials and highlight the need for accurate representations of tropical-extratropical teleconnections in simulations of past and future precipitation changes in the region.
Ajuts:	Ministerio de Economía y Competitividad MDM-2015-0552
Nota:	Unidad de excelencia María de Maeztu MdM-2015-0552
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Science advances, Vol. 4, Issue 11 (November 2018) , art. eaav0118, ISSN 2375-2548

DOI: 10.1126/sciadv.aav0118
PMID: 30498784

10 p, 2.2 MB

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