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At local and regional scales, the timing of MCA and LIA peak temperatures differs substantially, in line with previous findings.
We show that the synchronization of the MCA and LIA peak temperatures tends to be more coherent at longer time and larger space scales. Here, we assess the agreement of MCA and LIA peak temperatures at various timescales (i.e., from 51 to 351 years) by analyzing proxy-based temperature reconstructions at local, regional, and continental scales across the Northern Hemisphere. However, it is still unclear whether and to what extent this conception is independent on the space and time scales considered. Previous studies have suggested that preindustrial climate epochs such as the Medieval Climate Anomaly (MCA) and Little Ice Age (LIA) did not occur synchronously across large areas of the globe.
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