324 results for browsing: Unknown
Nutrient-doped synthetic silicates for enhanced weathering, remineralization and fertilization on agricultural lands of global cold regions – A perspective on the research ahead
Andrea Hicks, Pratik Dholabhai, Asif Ali, Rafael M. Santos
Abstract
There is now a dire demand for negative emissions technologies (which sequester CO2 from the atmosphere) that can be rapidly deployed, are scalable, and are demonstrably safe and effective. Enhanced weathering of silicate minerals has demonstrated a significant potential for CO2 capture and sequestration by the formation of pedogenic carbonates in soils, subsoils, and sediments. This technique has also been shown to deliver fruitful results in terms of improving soil health, and in turn plant health, through remineralization. The silicate minerals that possess the highest ...
The potential of enhanced weathering as a CO2 removal technique in UK agricultural soils
Frances Buckingham
Abstract
Enhanced weathering (EW) is increasingly proposed as a promising negative emission
technology that sequesters atmospheric carbon dioxide without substantially changing
established agricultural practices. Current estimates suggest enhanced weathering
could remove 0.5-4 GtCO2 yr-1 globally by the end of this century (Smith et al., 2015) which equates to a substantial fraction of global anthropogenic emissions (49 GtCO2eq yr-1; IPCC, 2014). However, these estimates are based on limited experimental
assessment of the complexities of the soil environment which inhibit alkalinity release, and existing pot and core ...
Silicate weathering in the Ganges alluvial plain
Patrick J. Frings, Wim Clymans, Guillaume Fontorbe, William Gray, Govind J. Chakrapani, Daniel J. Conley, Christina De La Rocha
Abstract
The Ganges is one of the world’s largest rivers and lies at the heart of a body of literature that investigates the interaction between mountain orogeny, weathering and global climate change. Three regions can be recognised in the Ganges basin, with the Himalayan orogeny to the north and the plateaus of peninsular India to the south together delimiting the Ganges alluvial plain. Despite constituting approximately 80%
of the basin, weathering processes in the peninsula and alluvial plain have received little ...
oxalate secretion by ectomycorrhizal Paxillus involutus is mineral-speciic and controls calcium weathering from minerals
A. schmalenberger, A. L. Duran, A. W. Bray, J. Bridge, s. Bonneville, L. G. Benning, M. e. Romero-Gonzalez, J. R. Leake, s. A. Banwart
Abstract
oxalate secretion by ectomycorrhizal Paxillus involutus is mineral-speciic and controls calcium weathering from minerals
How temperature-dependent silicate weathering acts as Earth’s geological thermostat
S. L. Brantley, Andrew Shaughnessy, Marina I. Lebedeva, Victor N. Balashov
Abstract
Earth’s climate may be stabilized over millennia by solubilization of atmospheric carbon dioxide (CO2) as minerals weather, but the temperature sensitivity of this thermostat is poorly understood. We discovered that the temperature dependence of weathering expressed as an activation energy increases from laboratory to watershed as transport, clay precipitation, disaggregation, and fracturing increasingly couple to dissolution. A simple upscaling to the global system indicates that the temperature dependence decreases to ~22 kilojoules per mole because (i) the ...
Geochemical carbon dioxide removal potential of Spain
Liam A. Bullock, Juan Alcalde, Fernando Tornos, Jose-Luis Fernandez-Turiel
Abstract
Many countries have made pledges to reduce CO2 emissions over the upcoming decades to meet the Paris Agreement targets of limiting warming to no >1.5 °C, aiming for net zero by mid-century. To achieve national reduction targets, there is a further need for CO2 removal (CDR) approaches on a scale of millions of tonnes, necessitating a better understanding of feasible methods. One approach that is gaining attention is geochemical CDR, encompassing (1) in-situ injection of CO2-rich gases into Ca and Mg-rich rocks for geological storage by mineral carbonation, (2) ...
Enhanced Rock Weathering in the Global South: Exploring Potential for Enhanced Agricultural Productivity and Carbon dioxide Drawdown
F. Garrett Boudinot, Gabrielle Dreyfus, Caitlan Frederick, Yifan Powers
Initiative Review
Precision Development (PxD) and the Institute for Governance & Sustainable Development (IGSD) are partnering on a unique initiative to collaboratively identify opportunities for innovation in climate change mitigation, particularly for the greenhouse gases most problematic in agricultural production, methane and nitrous oxide, as well as carbon dioxide. We are specifically focused on innovations with pertinence to the world’s smallholder farmers, who farm most of the world’s approximately 570 million farms.1 The Food and Agriculture Organization of the ...
A new soil-based approach for empirical monitoring of enhanced rock weathering rates
Tom Reershemius, Mike E. Kelland, Isabelle R. Davis, Rocco D’Ascanio, Boriana Kalderon Asael, Dan Asael, Dimitar E. Epihov , David J. Beerling, Christopher T. Reinhard , Noah J. Planavsky
Abstract
Enhanced rock weathering (ERW) has been touted as a scalable and cost-effective
potential carbon dioxide removal (CDR) strategy with significant environmental and agronomic co-benefits. However, a major barrier to implementation of ERW at scale is a robust monitoring, reporting, and verification (MRV) framework that can accurately, precisely, and cost-effectively measure the amount of carbon dioxide being removed by ERW in the field. Here we outline ...
