CASPER: A modelling framework to link mineral carbonation with the turnover of organic matter in soil

Ben W. Kolosz, Saran P. Sohi, David A. C. Manning

Research output: Contribution to journalArticle

1 Citation (Scopus)
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Abstract

Rapid formation of stable soil carbonates offers a potential biologically-mediated strategy for removing atmospheric CO2 and forms a part of the negative emissions debate in a bid to maintain global temperatures of 1.5 °C. Microbial respiration in soil and respiration by plant roots leads to high partial pressure of CO2 below ground. Given adequate supply of calcium in soil solution the sequestration of C into the mineral calcite (CaCO3) can occur at rapid rates. We have coupled an established soil C model RothC to a simplified geochemical model so that this strategy can be explored and assessed by simulation. The combined model CASPER partitions CO2 respired belowground into soil solution as HCO3− and simulates its reaction with Ca2+ based on a particular dissolution rate for Ca-bearing minerals, with precipitation of calcite into soil pores as a consequence. Typical model output matches observed field rates of calcite accumulation over 5 years, namely 81 t ha−1, with 19 t CO2 ha−1 sequestered into the soil.
Original languageEnglish
Pages (from-to)58-71
Number of pages14
JournalComputers and Geosciences
Volume124
Early online date5 Jan 2019
DOIs
Publication statusPublished - Mar 2019

Keywords

  • Carbon capture
  • Mineral weathering
  • Soil carbon modelling
  • Soil inorganic carbon

ASJC Scopus subject areas

  • Information Systems
  • Computers in Earth Sciences

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