This looks interesting: a new paper from D’Andrea et al describes some climate fluctuations in Greenland at the end of the Medieval Warm Period and the beginning of the Little Ice Age.
Greenland's early Viking settlers were subjected to rapidly changing climate. Temperatures plunged several degrees in a span of decades, according to research from Brown University. A reconstruction of 5,600 years of climate history from lakes near the Norse settlement in western Greenland also shows how climate affected the Dorset and Saqqaq cultures.
H/T Messenger