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

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.
LanguageEnglish
Pages58-71
Number of pages14
JournalComputers and Geosciences
Volume124
Early online date5 Jan 2019
DOIs
StatePublished - Mar 2019

Fingerprint

turnover
organic matter
mineral
modeling
soil
calcite
respiration
partial pressure
calcium
dissolution
carbonate
simulation
rate
temperature

Cite this

@article{e1c105f4f0654f13bb686ad57333d461,
title = "CASPER: A modelling framework to link mineral carbonation with the turnover of organic matter in soil",
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.",
author = "Kolosz, {Ben W.} and Sohi, {Saran P.} and Manning, {David A. C.}",
year = "2019",
month = "3",
doi = "10.1016/j.cageo.2018.12.012",
language = "English",
volume = "124",
pages = "58--71",
journal = "Computers and Geosciences",
issn = "0098-3004",
publisher = "Elsevier Limited",

}

CASPER: A modelling framework to link mineral carbonation with the turnover of organic matter in soil. / Kolosz, Ben W.; Sohi, Saran P.; Manning, David A. C.

In: Computers and Geosciences, Vol. 124, 03.2019, p. 58-71.

Research output: Contribution to journalArticle

TY - JOUR

T1 - CASPER: A modelling framework to link mineral carbonation with the turnover of organic matter in soil

AU - Kolosz,Ben W.

AU - Sohi,Saran P.

AU - Manning,David A. C.

PY - 2019/3

Y1 - 2019/3

N2 - 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.

AB - 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.

U2 - 10.1016/j.cageo.2018.12.012

DO - 10.1016/j.cageo.2018.12.012

M3 - Article

VL - 124

SP - 58

EP - 71

JO - Computers and Geosciences

T2 - Computers and Geosciences

JF - Computers and Geosciences

SN - 0098-3004

ER -