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Here we present the first high-resolution δ18O record of a stalagmite from western Cuba. The record reflects precipitation variability in the northwestern Caribbean during the last 1.3 ka and exhibits a correlation to the Atlantic Multidecadal Oscillation (AMO). This suggests a relationship between Caribbean rainfall intensity and North Atlantic sea-surface temperature (SST) anomalies. A potential mechanism for this relationship may be the strength of the Thermohaline Circulation (THC). For a weaker THC, lower SSTs in the North Atlantic possibly lead to a southward shift of the Intertropical Convergence Zone and drier conditions in Cuba. Thus, this Cuban stalagmite records drier conditions during cold phases in the North Atlantic such as the ‘Little Ice Age’. This study contributes to the understanding of teleconnections between North Atlantic SSTs and northern Caribbean climate variability during the past 1.3 ka.

We present 22 U-series ages for a stalagmite from northwestern Cuba based on multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) and thermal ionisation mass spectrometry (TIMS). Our results reveal that the stalagmite continuously grew within the last ∼1400 a. Low uranium content of the sample and thus, extremely low 230 Th concentrations limit the precision and accuracy of 230 Th/U-dating by TIMS. Samples measured by MC-ICPMS show a high variability of 232 Th content along the growth axis with some sections significantly affected by initial 230 Th from a detrital phase. An a-priori bulk earth ratio for (238 U/ 232 Th) cannot be used to accurately account for this initial 230 Th. Using an age model based on the 230 Th/U ages determined on samples with low or negligible 232 Th concentration, we find that the (238 U/ 232 Th) activity ratio of the detrital phase is an order of magnitude larger than the bulk earth value, indicating the importance of an accurately determined correction factor.

Santa Cruz de los Pinos is a small town like most others in the Cuban countryside. But half a century ago it was the epicenter of the 1962 Missile Crisis. During that time it served as a Soviet base for middle-range nuclear missiles, and the US air reconnaissance photos of it were spread through media all around the world. The crisis was solved through negotiations without Cuban involvement, and as a result of this neglect the Missile Crisis has been an under-communicated part of history in Cuba. A Swedish—Cuban research project has now investigated what kinds of memories of the crisis remain today at the former missile base — in the ground as well as in people’s minds. Digging in the ground has proved to be an effective way to start a remembering process and to help disarm a politically loaded history and uncover stories other than those dominating ‘big history’.