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. 2017 Sep 11;7:11216. doi: 10.1038/s41598-017-11742-8

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Blow up comparing speleothem δ¹⁸O records from the northern and the southern Hemispheres between 25 and 23.2 ka BP. Speleothem δ¹⁸O record from the Yucatan Peninsula (20°N) (A), Hulu, China (32°N)⁴ (B), Perú (11°S)⁷ (C), and Paraíso, Amazon Basin (5°S)¹⁵ (D). The time resolution of these records is shown. Cross-correlation coefficient (r²) and phase relationship between the YP speleothem δ¹⁸O record and the other speleothem δ¹⁸O records are shown. Negative/positive phase values represent that the YP δ¹⁸O record lags/leads the other speleothem δ¹⁸O records, respectively. These records are in phase within their combined age uncertainties. Small color box above each record shows the U-Th age and its uncertainty (2 Sigma) available for each record within this time interval (Itzamna = ±73 years; Hulu = ±100 years; Perú = ±50 years; Paraíso = ±84 years). Vertical color bars illustrate the transition from humid to drier conditions as suggested by these speleothem δ¹⁸O records reflecting precipitation amount.