Dynamic and thermodynamic influences on precipitation in Northeast Mexico on orbital to millennial timescales

Kevin T. Wright (), Kathleen R. Johnson (), Gabriela Serrato Marks, David McGee, Tripti Bhattacharya, Gregory R. Goldsmith, Clay R. Tabor, Jean-Louis Lacaille-Muzquiz, Gianna Lum and Laura Beramendi-Orosco
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Kevin T. Wright: University of California, Irvine, 3200 Croul Hall
Kathleen R. Johnson: University of California, Irvine, 3200 Croul Hall
Gabriela Serrato Marks: Atmospheric and Planetary Sciences, Massachusetts Institute of Technology
David McGee: Atmospheric and Planetary Sciences, Massachusetts Institute of Technology
Tripti Bhattacharya: Syracuse University
Gregory R. Goldsmith: Chapman University
Clay R. Tabor: University of Connecticut
Jean-Louis Lacaille-Muzquiz: Independent researcher
Gianna Lum: University of California, Irvine, 3200 Croul Hall
Laura Beramendi-Orosco: Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract The timing and mechanisms of past hydroclimate change in northeast Mexico are poorly constrained, limiting our ability to evaluate climate model performance. To address this, we present a multiproxy speleothem record of past hydroclimate variability spanning 62.5 to 5.1 ka from Tamaulipas, Mexico. Here we show a strong influence of Atlantic and Pacific sea surface temperatures on orbital and millennial scale precipitation changes in the region. Multiple proxies show no clear response to insolation forcing, but strong evidence for dry conditions during Heinrich Stadials. While these trends are consistent with other records from across Mesoamerica and the Caribbean, the relative importance of thermodynamic and dynamic controls in driving this response is debated. An isotope-enabled climate model shows that cool Atlantic SSTs and stronger easterlies drive a strong inter-basin sea surface temperature gradient and a southward shift in moisture convergence, causing drying in this region.

Date: 2023
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DOI: 10.1038/s41467-023-37700-9

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