International Water Research Institute, Mohammed VI Polytechnic University, Ben Guerir, Morocco.
Department of Environment and Geography, Bishop's University, 2600 College Street, Sherbrooke, QC, Canada.
Sci Rep. 2022 Dec 1;12(1):20719. doi: 10.1038/s41598-022-24610-x.
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 δO 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.
我们展示了一段来自古巴西部的石笋记录，跨越了 98.7-84.9 ka BP 的时间段。我们的记录显示了两个独特的高 δO 时期，分别对应于 85-87.6 和 90.2-93.1 ka BP 期间的干燥和/或寒冷时期，与 Heinrich 事件 8 和 9（H8 和 H9）同步。因此，我们提供了加勒比地区气候对 H8 和 H9 响应的第一个代理证据。有趣的是，H8 比 H9 更为明显，这可能是北大西洋温度降低导致 AMOC 减弱和深层水形成减少，从而导致 ITCZ 向南更强移动的局部反应。我们的数据补充了来自古巴西部的现有石笋记录，这些记录共同提供了过去 100 ka BP 的近乎连续的古气候时间序列，表明对千年尺度事件的一致响应是干燥和/或较冷的条件。与区域古气候记录的比较显示出与南美洲的反相关关系，这是由于千年尺度事件期间 ITCZ 的向南移动导致加勒比地区干燥和更强的南美季风系统。
