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Mechanisms of gas-driven mineral weathering in a changing climate

Project description

A closer look at how mineral weathering is controlled

Mineral weathering is a natural process that leads to the release of nutrients in the soil and removes CO2 from the atmosphere. These weathering reactions are vital for life, the regulation of atmospheric CO2 concentrations and climate. Climate change, however, is impacting this process. The EU-funded DryCO2 project aims to enhance understanding of the physical and chemical control of mineral weathering induced by the gas phase in the unsaturated zone to evaluate the evolution of the climate during the history of Earth; moreover, it aims to optimise the artificial removal of CO2 for climate change mitigation and predict the impact of future anthropogenic climate change on the weathering reactions of minerals that store CO2 and release nutrients.

Objective

Chemical reactions in the unsaturated zone in Earth's shallow subsurface, where pores are filled with a mixture of fluid and gas, support life on our planet and have a profound influence on the global carbon cycle and climate. Gas-driven mineral weathering reactions not only provide nutrients essential to life but serve to regulate atmospheric CO2 concentrations and climate, and are facilitated in the unsaturated zone where reactive gases like CO2 and O2 are readily transported. Earth's climate has experienced major fluctuations over its history, and is currently changing rapidly due to human activities. Climate change impacts the size and water content of the unsaturated zone, and therefore the rates of mineral weathering. At present, prediction of the impacts of changes in water saturation, CO2 concentration, and temperature on mineral weathering rates is hindered by an incomplete understanding of the controls on mineral weathering in the unsaturated zone. DryCO2 will elucidate the physical and chemical controls on gas-driven mineral weathering in the unsaturated zone to evaluate climate evolution over Earth's history, to optimize engineered CO2 removal for climate change mitigation, and to forecast the impact of future anthropogenic climate change on the mineral weathering reactions that store CO2 and release nutrients. DryCO2 will comprise five work packages, and combines experimental studies at multiple scales in the laboratory and field, analysis of key field samples, and multi-scale reactive transport modelling. This multi-scale, multi-tool approach will allow DryCO2 to quantify the effects of CO2 concentration and changes in water availability on mineral weathering reactions from the mineral surface to the global scale in a comprehensive fashion.

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Topic(s)

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Funding Scheme

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HORIZON-ERC - HORIZON ERC Grants

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Call for proposal

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(opens in new window) ERC-2021-STG

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Host institution

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 1 499 176,00
Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 1 499 176,00

Beneficiaries (1)

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