A Possible Younger Dryas Record in Southeastern Alaska

• Published in: Science
• Main Authors: Engstrom, D. R., Hansen, B. C. S., Wright, H. E.
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Association for the Advancement of Science (AAAS) 1990
• Subjects: Glacier Bay; Parkland; glacier; North Atlantic; Tundra; Alaska
• Online Access: https://doi.org/10.1126/science.250.4986.1383; https://www.science.org/doi/pdf/10.1126/science.250.4986.1383

A stratigraphic record of climatic cooling equal in timing and severity to the Younger Dryas event of the North Atlantic region has been obtained from lacustrine sediments in the Glacier Bay area of southeastern Alaska. Fossil pollen show that a late Wisconsin pine parkland was replaced about 10,800 years ago by shrub- and herb-dominated tundra, which lasted until about 9,800 years ago. This vegetational change is matched by geochemical evidence for loss of organic matter from catchment soils and increased mineral erosion. If this event represents the Younger Dryas, then an explanation for a hemisphere-wide propagation of a North Atlantic climatic perturbation must be sought.