Schlagwort: enhanced weathering

Nature – Klemme et al. (2022): Destabilization of carbon in tropical peatlands by enhanced weathering

Alexandra Klemme, Tim Rixen, Moritz Müller, Justus Notholt, Thorsten Warneke IN: Nature – Commun Earth Environ 3, 212 (2022). https://doi.org/10.1038/s43247-022-00544-0

Here, the authors present estimates for the response of CO2 emissions from tropical peat soils, rivers and coastal waters to changing soil acidity induced by enhanced weathering application. They estimate that the potential carbon uptake associated with enhanced weathering is reduced by 18–60% by land-based re-emission of CO2 and is potentially offset completely by emissions from coastal waters.

LINK

Can the power of biota bring rocks to the front of climate solutions? – The BAM! project

by University of Antwerp on uantwerpen.be

A European research consortium investigates whether a low-energy solution for carbon capture can be designed using an ooze of rocks, fungi, bacteria and earthworms. „Can we use the power of biology to increase the rate of silicate weathering to unmatched levels in a bio-reactor?“ That is the key question addressed in BAM! (Super-Bio-Accelerated Mineral weathering), a project funded by the European Innovation Council through the Pathfinder programme.  

LINK

My Climate journey – Startup Series: Enhanced Rock Weathering w/ Lithos Carbon & Eion Carbon

on myclimatejourney.substack.com, 1h 13min

„This series traverses disciplines, industries, and opinions with hundreds of deep-dive conversations with science, technology, and climate leaders. […] In this episode, guests are Mary Yap, Co-Founder and CEO at Lithos Carbon, and Adam Wolf, Co-Founder and CEO at Eion Carbon. Both Lithos and Eion work on enhanced rock weathering.“

LINK

Knapp & Tipper (2022): The efficacy of enhancing carbonate weathering for carbon dioxide sequestration

William J. Knapp and Edward T. Tipper IN: Frontiers in Climate, Sec. Negative Emission Technologies, https://doi.org/10.3389/fclim.2022.928215

Difference in calcite solubility between soils (where weathering occurs) and rivers (where HCO−3 is transported) may lead to large amounts of secondary carbonate formation during transport, releasing the CO2 consumed through dissolution. Here, the authors present a modeling study comparing the estimated soil dissolution capacity (SDC) in 149 of Earth’s largest river basins, to the potential transport capacity of carbon (PTCC) in corresponding rivers. They find the SDC can only be exported to the oceans, without secondary carbonate precipitation, if rivers are in disequilibrium with respect to calcite (i.e., SIc = 1).

LINK

Amann et al. (2022): Enhanced weathering potentials—the role of in situ CO2 and grain size distribution

Thorben Amann, Jens Hartmann, Roland Hellmann, Elisabete Trindade Pedrosa, Aman Malik IN: Frontiers in Climate, Sec. Negative Emission Technologies, https://doi.org/10.3389/fclim.2022.929268

To elucidate the effects of grain size distribution and soil partial pressure of carbon dioxide (pCO2) levels on CO2 uptake rates, two simple column experiments were designed and filled nearly daily with an amount of water that simulates humid tropical conditions, which prevail in areas known for being hotspots of weathering. Multiple materials (dunite, basanite, agricultural oxisol, a combination of the latter two, and loess) were compared under ambient and 100% CO2 atmosphere. In a second series, single material columns (dunite) were filled with three different grain size distributions. Total alkalinity, pH, major ions, and dissolved silica were determined in the outflow water of the columns for about 300 days.

LINK

This is CDR Ep. 44: The Carbon Drawdown Initiative

by OpenAir on Youtube.com (58 min)

In this episode, the Carbon Drawdown Initiative Founder and CEO Dirk Paessler, and geologist Ingrid Smet talked about Project Carbdown, a long-term field enhanced rock weathering (ERW) field trial, with a focus on the Project’s efforts to develop effective and practical measurement, reporting, and verification (MRV) of ERW as a method of durable carbon removal.

LINK

Climate Hacker’s Cheat Sheet: Enhanced Rock Weathering on Croplands

on carbon-drawdown.de

The authors started to make notes about the various parameters that they would need to take into account in their enhanced weathering projects and experiments (e.g. from Carbon Drawdown Initiative) to make sure the desired weathering outcomes would actually be possible. They discussed the data with many of the scientists they work with to achieve a kind-of-peer-review-process. They are now sharing this cheat sheet with the community because they believe their work could be of help to others working on ERW projects.

LINK

Policy brief: Soils Research to deliver Greenhouse Gas Removals and Abatement Technologies (SOILS-R-GGREAT)

UK GGR Research Programme

Through new research on global croplands SOILS-R-GGREAT researchers have estimated that arable farming has produced a loss of around 25 Gt carbon relative to the natural state in 1975 but, since that time, there has been an addition of about 4Gt of soil organic carbon (SOC) due to improved agricultural practices. Alongside agricultural management, approaches such as addition of biochar or enhanced weathering of silicate rocks on soils can improve carbon storage. Researchers present possible CO₂ sequestration from these two techniques in Sao Paulo State, Brazil.

LINK