EGU22-10715, updated on 28 Mar 2022
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Understanding climate, precipitation and δ18O linkages over Eastern Asia

Nitesh Sinha1,2, Axel Timmermann1,2, Jasper A. Wessenburg1,2, and Sun-Seon Lee1,2
Nitesh Sinha et al.
  • 1Center for Climate Physics, Institute for Basic Science, Busan, Republic of Korea, 46241
  • 2Pusan National University, Busan, Republic of Korea, 46241

The interpretation of East Asian monsoon speleothem δ18O records is heavily debated in the paleoclimate community. Besides developing new speleothem proxies, the use of isotope-enabled climate simulations is one of the key tools to enhance our understanding of speleothem δ18O records. Here we present results from novel climate simulations performed with the fully coupled isotope-enabled Community Earth System Model (iCESM1.2), which simulates global variations in water isotopes in the atmosphere, land, ocean, and sea ice. The model closely captures the major observed features of the isotopic compositions in precipitation over East Asia for the present-day conditions. To better understand the physical mechanisms causing interannual to orbital timescale variations in δ18O in East Asian speleothems, we ran a series of experiments with iCESM. We perturbed solar, orbital, bathymetry, ice-sheet, and greenhouse gas radiative forcings. The simulations supporting of observations/reconstructed records (GNIP/SISAL) from East Asia, help understand the controls on the isotope composition of East Asian monsoon rainfall and how speleothem δ18O records may be interpreted in terms of climate. The study provides new insights into the mechanisms of East Asian monsoon changes on different timescales.

How to cite: Sinha, N., Timmermann, A., Wessenburg, J. A., and Lee, S.-S.: Understanding climate, precipitation and δ18O linkages over Eastern Asia, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-10715,, 2022.