EGU23-10022, updated on 26 Feb 2023
EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Global carbon cycle response to Milanković forcing

Miho Ishizu1,2, Axel Timmerman1,2, and Kyung-Sook Yun1,2
Miho Ishizu et al.
  • 1Center for Climate Physics, Institute for Basic Science, Korea, Republic of Korea (
  • 2Pusan National University, Busan, Republic of Korea

To gain a deeper understanding of why atmospheric CO2 varied on Milanković timescales, we conducted a 3 million-year transient carbon cycle simulation with the intermediate-complexity Grid Enabled Integrated Earth System (cGENIE). To this end we nudged ocean temperature and salinity obtained from a previously conducted 3 million-year climate simulation conducted with the Community Earth System Model (CESM1.2) into the cGENIE ocean model. The cGENIE model captures key processes relevant for the longterm behaviour of the carbon cycle, including ocean biogeochemistry, vegetation, land surface weathering and sedimentary dynamics. Here we will present the first results from a series of transient glacial-interglacial simulations cGENIE simulations which identify the role of ocean circulation, sea ice, solubility and land vegetation changes as drivers of low frequency pCO2 variability. We will further discuss the effects of iron fertilization and carbonate compensation.  

How to cite: Ishizu, M., Timmerman, A., and Yun, K.-S.: Global carbon cycle response to Milanković forcing, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-10022,, 2023.