EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Perturbations of volcanic CO2 emission to orbital paced climate-carbon cycle

Fenghao Liu1,2, Enqing Huang1, Jinlong Du1, Wentao Ma3, Xiaolin Ma4, Lucas Lourens2, and Jun Tian1
Fenghao Liu et al.
  • 1State Key Laboratory of Marine Geology, Tongji University, 200092 Shanghai, China (
  • 2Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, Netherlands (
  • 3State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, 310012, China
  • 4State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China

How the global carbon cycle and climate changes interact on orbital timescales under different boundary conditions remains elusive. Previous studies have found that changes in global ice-sheet volume and marine carbon cycle are synchronized at the eccentricity time scales with a slight lead of climate-cryosphere relative to carbon cycle throughout Oligo-Miocene (~34-6 Ma). Here, we analyze the evolutive phase relationship between benthic foraminiferal oxygen (δ18O) and carbon isotope (δ13C) to reveal an unnoticed phenomenon that variations of oceanic carbon cycle could lead those of global ice-sheet volume on 405-kyr cycle during Miocene Climate Optimum (MCO, ~17-14 Ma), which was a profound warming interval partly ascribed to the carbon emission from the eruption of the Columbia River Basalts Group (CRBG). Eccentricity sensitivity analysis indicate a relatively constant response of ice sheet to orbital forcing during MCO. Combined the results of box model, we propose that volcanic CO2 input accelerates the response of marine carbon cycle to orbital forcing. The enhanced greenhouses effect probably had strengthened the low-latitude hydrological cycle and chemical weathering and ultimately generated the δ13C-lead-δ18O scenario.

How to cite: Liu, F., Huang, E., Du, J., Ma, W., Ma, X., Lourens, L., and Tian, J.: Perturbations of volcanic CO2 emission to orbital paced climate-carbon cycle, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-6429,, 2022.