Hydroclimate variability in the Caribbean during North Atlantic Heinrich cooling events (H8 and H9)

• Published in: Scientific Reports
• Main Authors: Ait Brahim, Yassine, Peros, Matthew C., Viau, André E., Liedtke, Mercedes, Pajón, Jesús M., Valdes, Julio, Li, Xianglei, Edwards, R. Lawrence, Reinhardt, Eduard G., Oliva, Frank
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer Nature 2022
• Subjects: climate change; geochemistry; palaeoclimate; North Atlantic
• Online Access: https://doi.org/10.1038/s41598-022-24610-x; https://nrc-publications.canada.ca/eng/view/ft/?id=b270ebe8-7d4b-4351-af81-86857808f40b; https://nrc-publications.canada.ca/eng/view/object/?id=b270ebe8-7d4b-4351-af81-86857808f40b; https://nrc-publications.canada.ca/fra/voir/objet/?id=b270ebe8-7d4b-4351-af81-86857808f40b

We present a speleothem record from western Cuba, spanning the period 98.7–84.9 ka BP. Our record shows two distinctive periods of high δ¹⁸O corresponding to dry and/or cold periods during 85–87.6 and 90.2–93.1 ka BP, synchronous with Heinrich events 8 and 9 (H8 and H9). Hence, we provide the first proxy evidence of the local Caribbean climate response to H8 and H9. Interestingly, H8 is more pronounced compared to H9, which may be a local response to lower temperatures in the North Atlantic resulting in a weak AMOC and reduced deep water formation, therefore a stronger south shift of the ITCZ. Our data complement existing speleothem records from western Cuba which, collectively, provide a nearly continuous paleoclimate time-series spanning the last 100 ka BP, indicating a consistent response to millennial-scale events as dry and/or cooler conditions. The comparison with regional paleoclimate records reveals an anti-phased relationship with South America, caused by the southern movements of the ITCZ during millennial-scale events which lead to dry conditions in the Caribbean and a stronger South American Monsoon System. Peer reviewed: Yes NRC publication: Yes