SubsidieMeestersDeciphering the Effect of Vegetation and Erosion on basalt and carbonate weathering by Novel Denudation Rate Approaches
DEVENDRA aims to develop a novel method for measuring weathering rates in basalt and carbonate rocks to enhance global carbon cycle models and predict future CO2 emissions trajectories.
Projectdetails
Introduction
The chemical weathering of rocks on the Earth’s surface draws down atmospheric CO2, balancing emissions from volcanoes and maintaining habitable temperatures. Basalt and carbonate rocks are particularly crucial in this balance, because they are efficiently weathered.
Importance of Basalt and Carbonate Rocks
As estimated from studies of the dissolved elements in rivers, basalt accounts for 20-35% of modern global silicate weathering and CO2 consumption flux, despite only covering 5% of Earth’s surface.
Need for Accurate Descriptions
To formulate sensitivities and feedbacks between the weathering of these rocks and climate, we need an accurate description of the exact processes that drive the conversion of rock to soil by weathering.
Factors Influencing Weathering
Besides water flow, erosion rate, and vegetation are thought to exercise significant control. Currently, however, we lack the tools needed to decipher these controls.
Limitations of Current Methods
The preferred approach used to quantify erosion and weathering rates – cosmogenic nuclides, produced in situ in quartz – does not work in basalt and carbonate lithologies.
Project Aim
The aim of DEVENDRA, dedicated to the pioneer of cosmogenic nuclide geochemistry Devendra Lal (1920 – 2012), is to eliminate this blind spot using a novel method never applied to basalt and carbonate lithologies:
- The ratio of cosmogenic beryllium-10 rained out from the atmosphere
- Stable beryllium-9 released by weathering.
Development of New Method
DEVENDRA will develop this system as a novel erosion and weathering rate meter for these rocks.
Calibration and Application
The project will use this new method to calibrate – using globally-distributed soil profiles and catchments of differing climate and erosion rate – the laws that govern weathering and CO2 drawdown in these rocks.
Expected Outcomes
The outcomes from DEVENDRA will refine the global weathering models that are used to understand Earth’s carbon cycle on geological time scales. This will help to:
- Predict the trajectory of anthropogenic CO2 in coming centuries
- Estimate the potential for negative CO2 emissions by artificially-enhanced weathering of basalts.
Financiële details & Tijdlijn
Financiële details
| Subsidiebedrag | € 2.277.587 |
| Totale projectbegroting | € 2.277.587 |
Tijdlijn
| Startdatum | 1-4-2023 |
| Einddatum | 31-3-2028 |
| Subsidiejaar | 2023 |
Partners & Locaties
Projectpartners
- FREIE UNIVERSITAET BERLINpenvoerder
- HELMHOLTZ ZENTRUM POTSDAM DEUTSCHES GEOFORSCHUNGSZENTRUM GFZ
Land(en)
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