- 1Key Laboratory for Virtual Geographic Environment, Ministry of Education; State Key Laboratory Cultivation Base of Geographical Environment Evolution and regional response of Jiangsu Province; Jiangsu Center for Collaborative Innovation in Geographical In
- 2Department of Geography, The Ohio State University, Columbus, OH 43210, USA
- 3Jiangsu Provincial Key Laboratory for Numerical Simulation of Large Scale Complex Systems, School of Mathematical Science, Nanjing Normal University, Nanjing 210023, China
The 4.2 ka BP event is a pronounced climate event in the Holocene. Since this climate episode was associated with the collapse of several ancient civilizations in many sites worldwide such as Neolithic cultures in China, Ancient Egypt, and Indus Valley civilizations, it has been widely studied in recent years. However, the spatial distribution of precipitation is still controversial in some regions like eastern China. In this study, we use the offline ensemble Kalman filter (OEnKF) data assimilation (DA) method, combining the high-resolution δ18O from speleothems and iTraCE model data which simulates the water isotope, to reconstruct precipitation δ18O and precipitation in the Asian monsoon region during the 4.2 ka BP event. In our DA reconstruction, the precipitation during the 4.2 ka BP event shows a dry pattern from North China to Southwest China and India, and a wet pattern in the middle and lower Yangtze River.
How to cite: Xing, F., Ning, L., Liu, Z., Liu, J., Yan, M., Sun, W., and Wen, Q.: Precipitation reconstruction in the Asian monsoon region during the 4.2 ka BP event with paleoclimate data assimilation, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-2040, https://doi.org/10.5194/egusphere-egu25-2040, 2025.
