Using a relatively new scientific dating technique, geologists were able to document – for the first time – a drastic climate change 4,200 years ago in northern China that affected vegetation and led to mass migration from the area.
Steve Forman, Ph.D., professor of geology in the College of Arts & Sciences, and researchers — using a dating technique called Optically Stimulated Luminescence — uncovered the first evidence of a severe decrease in precipitation on the freshwater lake system in China’s Hunshandake Sandy Lands. The impact of this extreme climate change led to desertification — or drying of the region — and the mass migration of northern China’s Neolithic cultures.
Their research findings appeared in a recent issue of the Proceedings of the National Academy of Sciences.
“With our unique scientific capabilities, we are able to assert with confidence that a quick change in climate drastically changed precipitation in this area, although, further study needs to be conducted to understand why this change occurred,” Forman said.
Between 2001 and 2014, the researchers investigated sediment sections throughout the Hunshandake and were able to determine that a sudden and irreversible shift in the monsoon system led to the abrupt drying of the Hunshandake resulting in complications for the population.
“This disruption of the water flow significantly impacted human activities in the region and limited water availability. The consequences of a rapid climatic shift on the Hunshandake herding and agricultural cultures were likely catastrophic,” Forman said.
He said these climatic changes and drying of the Hunshandake continue to adversely impact the current population today. The Hunshandake remains arid and even with massive rehabilitation efforts will unlikely regrow dense vegetation.
“This study has far-reaching implications for understanding how populations respond and adapt to drastic climate change,” Forman said.
Forman is the director of the Geoluminescence Dating Research Lab in the department of geology.
Reference: Xiaoping Yang, Louis A. Scuderi, Xulong Wang, Louis J. Scuderi, Deguo Zhang, Hongwei Li, Steven Forman, Qinghai Xu, Ruichang Wang, Weiwen Huang, Shixia Yang. Groundwater sapping as the cause of irreversible desertification of Hunshandake Sandy Lands, Inner Mongolia, northern China. Proceedings of the National Academy of Sciences, 2015; 112 (3): 702 DOI:10.1073/pnas.1418090112