The 16th International Conference on Accelerator Mass Spectrometry

Numerical simulation of evolution of dissolved inorganic carbon chemical and isotopic compositions (13C and 14C) in carbonate-bearing areas

AEC-10

21 Oct 2024, 15:30

20m

GOLDEN CASSIA (金桂厅), 2nd Floor

Oral Presentation Applications of Atmospheric and Environmental C-14 Applications in Atmospheric and Environmental C-14

Speaker

Dr Jun Zhong (Tianjin University)

Description

Investigating the dissolved inorganic carbon (DIC) processes and associated chemical and isotopic (13C and 14C) evolutions is critical for deciphering its implications on climate change and groundwater quality. Growing number of 13C and 14C measurements of DIC in recent years,however, it is still unclear about the DIC evolution. In this study, we synthesize and deduce the isotopic fractionation and chemical equilibrium theory to understand DIC evolution under different scenarios. We summarize and model the DIC chemical and isotopic compositions in carbonate-rich areas, including:
(1) Carbonate weathering under close and open system
(2) Transition from open to close system
(3) DIC-carbonate exchange in close system
(4) Sulfuric acid-driven weathering
(5) The impacts of climate on carbonate weathering
(6) The effects of CO2 outgassing
With this work, we summarize the interactions between soil CO2, DIC and carbonates, and understand how the DIC chemical and isotopic compositions evolve.