Schlagwort: enhanced weathering

Peer-reviewed Publications

te Pas et al. (2026): Enhanced weathering and biochar co-deployment boosts CO₂ sequestration through changing soil properties

Emily E.E.M. te Pas, Rob N.J. Comans, Sarai Bisseling and Mathilde Hagens, IN: Geoderma, https://doi.org/10.1016/j.geoderma.2025.117668

Enhanced rock weathering (ERW) and biochar are potentially effective and scalable options for large-scale carbon dioxide removal (CDR), required to limit global temperature rise to 1.5 °C. Here the authors present experimental data on their co-deployment, an urgent and novel research direction that may render even larger CDR on multiple timescales.

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Peer-reviewed Publications

Katre et al. (2026): A review on geochemical carbon dioxide removal potential of mafic and ultramafic rocks in India

Shreya Katre, K. Ravi and Archana M. Nair, IN: Earth-Science Reviews, https://doi.org/10.1016/j.earscirev.2026.105419

Scalable geochemical Carbon Dioxide Removal (CDR) technologies are essential for limiting global warming to 1.5 °C. These technologies capture and permanently store atmospheric CO₂ as carbonates using alkaline substrates such as mafic and ultramafic rocks rich in calcium (Ca) and magnesium (Mg) minerals. This study is the first to comprehensively map and assess the significant geological resources of India for geochemical CDR.

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Peer-reviewed Publications

Aviso et al. (2026): Indirect carbon emissions of enhanced weathering in Malaysia

Kathleen B. Aviso, Dominic C.Y. Foo, Ivan Henderson V. Gue, Maria Victoria Migo-Sumagang, Raymond R. Tan and Yin Ling Tan, IN: Carbon Footprints, hppts://www.doi.org/10.20517/cf.2025.54

Enhanced weathering (EW) of rocks and minerals can be used as a carbon dioxide removal (CDR) technique. EW relies on accelerated geochemical reactions between carbonic acid in rainwater and slightly alkaline minerals to permanently sequester carbon atoms as bicarbonate ions in runoff water. The material needs to be crushed into a fine powder to increase its reactive surface area and then spread on land at a rate calibrated to local weather and soil conditions. However, large-scale EW using virgin material will increase outputs and carbon footprints across various economic sectors to support the CDR system. Input-output analysis is used to model such indirect effects when basalt EW is used in all oil palm plantations in Malaysia to cut greenhouse gas emissions.

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Peer-reviewed Publications

Hopkins & Lal (2026): Carbon dioxide removal by enhanced concrete weathering in soil

Brittany Multer Hopkins and Rattan Lal, IN: Technologies in Engineering and Environment for Global Impact, https://doi.org/10.1016/j.teengi.2026.100068

Carbon dioxide (CO₂) removal from the atmosphere is necessary to reduce negative impacts from climate change, and one method could be using waste concrete for enhanced concrete weathering (ECW), a subset of enhanced weathering.

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Peer-reviewed Publications

Rieder et al. (2026): Contribution of dissolved organic carbon to total alkalinity in Enhanced Weathering experiments

Lukas Rieder, Mathilde Hagens, Reinaldy Poetra, Alix Vidal, Tullia Calogiuri et al., IN: Applied Geochemistry, https://doi.org/10.1016/j.apgeochem.2026.106685

In this study, the authors tested how dissolved organic carbon (DOC) contributes to non-carbonate alkalinity (ANC) using microcosm experiments with artificial organo-mineral mixtures. They used different combinations of rock powder with straw, microbes and earthworm additions, under ambient air conditions. The microcosms were flow-through columns placed in a climate chamber at 25 °C, which were irrigated with groundwater at rates between 1200 and 3600 mm/yr. The concentrations of several low-molecular-weight organic acids (oxalate, citrate, acetate, gluconate) were quantified to assess which conjugate base anions impact the measured TA.

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Peer-reviewed Publications

Paessler et al. (2026): Is biomass yield increase a potential indicator for CDR performance of enhanced weathering?

Dirk Paessler, Jens S. Hammes, Ingrid Smet and Anna A. Stoeckel, IN: ResearchGate (preprint), https://doi.org/10.13140/RG.2.2.19883.50723

Enhanced weathering (EW) of alkaline feedstocks such as natural rocks or industrial by-products is a promising approach to remove CO₂ from the atmosphere. Finely ground feedstock, containing silicate and/or carbonate minerals, is spread on fields. When rain and CO₂ form carbonic acid it dissolves these minerals, which releases base cations and nutrients into the soil and also increases soil pH. The beneficial effects of rock dusts like lime on yields have been appreciated by farmers for centuries. For CDR projects crop yield increase is a welcome co-benefit, while the main desired effect is that the cations from the dissolving rock accompany bicarbonate ions in the leachate waters, which can be measured as increase in total alkalinity (TA). This carbon transport is essentially a way of capturing carbon from the air, a climate mitigation approach that is currently challenged by the high cost of MRV. When assessing the above-ground biomass and leachate data from the 2023/2024 greenhouse experiment, the authors have observed a significant correlation between the two. A significant increase in TA export of the rock-dust-treated pots almost always coincided with a significant increase in biomass. But the data does not yet allow the authors to understand what is the cause, and what is the effect. To fill this knowledge gap they published a call for proposals in October in which they offered their sample archive to labs for further investigation.

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Peer-reviewed Publications

Burger et al. (2025): Subsurface dissolution reduces the efficiency of mineral-based ocean alkalinity enhancement

Friedrich A. Burger, Urs Hofmann Elizondo, Hendrik Grosselindemann and Thomas L. Frölicher, IN: EGUSphere, https://doi.org/10.5194/egusphere-2025-5917

Most modeling studies assume complete surface dissolution, leaving the impact of subsurface dissolution on ocean carbon uptake poorly understood. Here, the authors develop idealized vertical mineral dissolution profiles that vary with environmental conditions and grain size. These profiles are implemented in a comprehensive Earth system model to assess the capture efficiency of OAE, defined as the additional carbon taken up by the ocean per alkalinity added.

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Peer-reviewed Publications

Jaimes-Gutierrez et al. (2025): Lithium isotopes reveal enhanced weathering fluxes in North America during the Paleocene−Eocene Thermal Maximum

Rocio Jaimes-Gutierrez, Lucas Vimpere, David J. Wilson, Patrick Blaser, Philip A.E. Pogge von Strandmann, Thierry Adatte, Swapan Sahoo and Sébastien Castelltort, IN: Geology, https://doi.org/10.1130/G53708.1

Silicate weathering regulates Earth’s long-term climate by removing atmospheric CO₂. Understanding changes in weathering regimes and rates is key to predicting climate response time scales. The authors investigated the reactivity of the North American source-to-sink system and the chemical weathering regime during the Paleocene−Eocene Thermal Maximum (PETM). They measured the detrital lithium isotope composition (δ⁷Li) in a deep-marine sediment core from the Gulf of Mexico, tracking changes in the formation of clay minerals, alongside neodymium isotopes (εNd), to constrain sediment provenance.

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Peer-reviewed Publications

Migo-Sumagang et al. (2025): A Mixed-Integer Linear Programming Model for Enhanced Weathering Networks Considering Logistical Emissions

Maria Victoria Migo-Sumagang, Kathleen B. Aviso, Dominic C. Y. Foo, Raymond R. Tan, Yin Ling Tan, IN: Chemical Engineering Transactions, https://doi.org/10.3303/CET25120015

In this work, the authors develop a mixed-integer linear programming model to optimize enhanced weathering networks to maximize CDR for a given set of sources (rock-crushing plants) and sinks (application sites). The model determines both topology (source-sink matches) and physical flow rates; alternative solutions can be explored using integer cut techniques.

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Peer-reviewed Publications

Muth et al. (2025): Direct In Situ Measurement of Alkalinity Export for Real-Time Enhanced Weathering MRV

Andrew Muth, Jonte Boysen, Pascal Michel, IN: CDRXiv Preprint, https://doi.org/10.70212/cdrxiv.2025456.v1

Accurate quantification of alkalinity export from the near-field zone remains a key bottleneck for monitoring, reporting, and verification (MRV) of carbon dioxide removal (CDR) through Enhanced Weathering (EW). Here the authors validate the Everest Pulsar, a field-deployable alkalinity sensor that accumulates total alkalinity (TA) using a weak acid ion-exchange resin and transduces resin saturation into a digital, in situ measurement.

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