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Last glacial hydroclimate variability in the Yucatán Peninsula not just driven by ITCZ shifts.
Travis-Taylor, Leah; Medina-Elizalde, Martín; Karmalkar, Ambarish V; Polanco-Martinez, Josué; Serrato Marks, Gabriela; Burns, Stephen; Lases-Hernández, Fernanda; McGee, David.
Afiliação
  • Travis-Taylor L; Department of Earth, Geographic, and Climate Sciences, UMass Amherst, Amherst, MA, USA. ltravistaylo@umass.edu.
  • Medina-Elizalde M; Department of Earth, Geographic, and Climate Sciences, UMass Amherst, Amherst, MA, USA.
  • Karmalkar AV; Department of Geosciences, University of Rhode Island, Kingston, RI, USA.
  • Polanco-Martinez J; GECOS-IME, Campus Miguel Unamuno, Edificio FES, Salamanca, and Basque Centre for Climate Change (BC3), University of Salamanca, Leioa, Spain.
  • Serrato Marks G; Department of Earth, Atmospheric, and Planetary Sciences, MIT, Cambridge, MA, USA.
  • Burns S; Department of Earth, Geographic, and Climate Sciences, UMass Amherst, Amherst, MA, USA.
  • Lases-Hernández F; Centro de Geociencias, UNAM Campus, Blvd. Juriquilla 3001, 76230, Juriquilla, Mexico.
  • McGee D; Department of Earth, Atmospheric, and Planetary Sciences, MIT, Cambridge, MA, USA.
Sci Rep ; 13(1): 14356, 2023 Sep 01.
Article em En | MEDLINE | ID: mdl-37658086
ABSTRACT
We reconstructed hydroclimate variability in the Yucatán Peninsula (YP) based on stalagmite oxygen and carbon isotope records from a well-studied cave system located in the northeastern YP, a region strongly influenced by Caribbean climate dynamics. The new stalagmite isotopic records span the time interval between 43 and 26.6 ka BP, extending a previously published record from the same cave system covering the interval between 26.5 and 23.2 ka BP. Stalagmite stable isotope records show dominant decadal and multidecadal variability, and weaker variability on millennial timescales. These records suggest significant precipitation declines in the broader Caribbean region during Heinrich events 4 and 3 of ice-rafted discharge into the North Atlantic, in agreement with the antiphase pattern of precipitation variability across the equator suggested by previous studies. On millennial timescales, the stalagmite isotope records do not show the distinctive saw-tooth pattern of climate variability observed in Greenland during Dansgaard-Oeschger (DO) events, but a pattern similar to North Atlantic sea surface temperature (SST) variability. We propose that shifts in the mean position of the Intertropical Convergence Zone (ITCZ), per se, are not the dominant driver of last glacial hydroclimate variability in the YP on millennial timescales but instead that North Atlantic SSTs played a dominant role. Our results support a negative climate feedback mechanism whereby large low latitude precipitation deficits resulting from AMOC slowdown would lead to elevated salinity in the Caribbean and ultimately help reactivate AMOC and Caribbean precipitation. However, because of the unique drivers of future climate in the region, predicted twenty-first century YP precipitation reductions are unlikely to be modulated by this negative feedback mechanism.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article