Pre-Boreal Climatic Interval

The Pre-Boreal Climatic Interval was a period of significant climatic change that occurred at the end of the last glacial period, approximately 11,700 years ago. This interval marked the transition from the cold, glacial conditions of the Pleistocene Epoch to the warmer, interglacial period known as the Holocene Epoch.1

During the Pre-Boreal, the massive continental ice sheets that covered large parts of North America and Europe began to melt back rapidly. This melting led to rising sea levels and altered atmospheric circulation patterns. The climate during this time was characterized by warming trends, though it was punctuated by transient cooling events, such as the Younger Dryas. The climatic regimes that developed in many areas during the deglaciation period have no modern analog, meaning there are no regions today with comparable seasonal temperature and moisture patterns. This unique climatic phase influenced the development of ecosystems and the early human populations that were beginning to expand globally.23