scholarly journals Enhanced chemical weathering as a geoengineering strategy to reduce atmospheric carbon dioxide, supply nutrients, and mitigate ocean acidification

2013 ◽  
Vol 51 (2) ◽  
pp. 113-149 ◽  
Author(s):  
Jens Hartmann ◽  
A. Joshua West ◽  
Phil Renforth ◽  
Peter Köhler ◽  
Christina L. De La Rocha ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ocean Acidification ◽  
Atmospheric Carbon Dioxide ◽  
Chemical Weathering ◽  
Atmospheric Carbon

scholarly journals Consumption of Atmospheric Carbon Dioxide through Weathering of Ultramafic Rocks in the Voltri Massif (Italy): Quantification of the Process and Global Implications

Geosciences ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 258
Author(s):  
Francesco Frondini ◽  
Orlando Vaselli ◽  
Marino Vetuschi Zuccolini
Keyword(s):  
Carbon Dioxide ◽  
Time Scales ◽  
Atmospheric Carbon Dioxide ◽  
Chemical Weathering ◽  
Weighted Average ◽  
Global Scale ◽  
Ultramafic Rocks ◽  
Co2 Consumption ◽  
Atmospheric Carbon ◽  
Good Proxy

Chemical weathering is the main natural mechanism limiting the atmospheric carbon dioxide levels on geologic time scales (>1 Ma) but its role on shorter time scales is still debated, highlighting the need for an increase of knowledge about the relationships between chemical weathering and atmospheric CO2 consumption. A reliable approach to study the weathering reactions is the quantification of the mass fluxes in and out of mono lithology watershed systems. In this work the chemical weathering and atmospheric carbon dioxide consumption of ultramafic rocks have been studied through a detailed geochemical mass balance of three watershed systems located in the metaophiolitic complex of the Voltri Massif (Italy). Results show that the rates of carbon dioxide consumption of the study area (weighted average = 3.02 ± 1.67 × 105 mol km−2 y−1) are higher than the world average CO2 consumption rate and are well correlated with runoff, probably the stronger weathering controlling factor. Computed values are very close to the global average of basic and ultrabasic magmatic rocks, suggesting that Voltri Massif is a good proxy for the study of the feedbacks between chemical weathering, CO2 consumption, and climate change at a global scale.

scholarly journals Chemical weathering and consumption of atmospheric carbon dioxide in the Alpine region

2016 ◽  
Vol 136 ◽  
pp. 65-81 ◽  
Author(s):  
Marco Donnini ◽  
Francesco Frondini ◽  
Jean-Luc Probst ◽  
Anne Probst ◽  
Carlo Cardellini ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Atmospheric Carbon Dioxide ◽  
Chemical Weathering ◽  
Alpine Region ◽  
Atmospheric Carbon

scholarly journals Rapid response of silicate weathering rates to climate change in the Himalaya

2021 ◽  
Author(s):  
Anthony Dosseto ◽  
Nathalie Vigier ◽  
Renaud Joannes-Boyau ◽  
Ian Moffat ◽  
Tejpal Singh ◽  
...  
Keyword(s):  
Climate Change ◽  
Carbon Dioxide ◽  
Atmospheric Carbon Dioxide ◽  
Chemical Weathering ◽  
Tight Coupling ◽  
Weathering Rates ◽  
Fluvial Terraces ◽  
Physical Erosion ◽  
Atmospheric Carbon ◽  
Earth’S Climate

Chemical weathering of continental rocks plays a central role in regulating the carbon cycle and the Earth’s climate (Walker et al., 1981; Berner et al., 1983), accounting for nearly half the consumption of atmospheric carbon dioxide globally (Beaulieu et al., 2012). However, the role of climate variability on chemical weathering is still strongly debated. Here we focus on the Himalayan range and use the lithium isotopic composition of clays in fluvial terraces to show a tight coupling between climate change and chemical weathering over the past 40 ka. Between 25 and 10 ka ago, weathering rates decrease despite temperature increase and monsoon intensification. This suggests that at this timescale, temperature plays a secondary role compared to runoff and physical erosion, which inhibit chemical weathering by accel-erating sediment transport and act as fundamental controls in determining the feedback between chemical weathering and atmospheric carbon dioxide.

Mitigation

2016 ◽  
Author(s):  
Henry Shue
Keyword(s):  
Climate Change ◽  
Carbon Dioxide ◽  
Sustainable Development ◽  
Ocean Acidification ◽  
Greenhouse Gas ◽  
Atmospheric Carbon Dioxide ◽  
Alternative Energy ◽  
Fossil Fuel ◽  
Energy Regime ◽  
Atmospheric Carbon

Mitigation—preventative actions to reduce the human forcing of climate change with the goal of keeping climate change within a range to which humans can adapt—must be prompt, rigorous, and focused on eliminating emissions of carbon dioxide, beginning with rapid cessation of the use of coal. Carbon dioxide is by far the most threatening greenhouse gas because it remains in the atmosphere for millennia longer than any other major greenhouse gas, and the heat retained on the planet by atmospheric carbon dioxide will continue to emerge from its transitional storage in the deep oceans for millennia after the atmospheric carbon finally dissipates. Sustainable development can be increased and ocean acidification can be stopped only if the dominant fossil fuel regime is promptly replaced by an affordable and accessible alternative energy regime. Poorer countries cannot be reasonably expected to cooperate with vigorous mitigation unless they are assisted with necessary adaptation.

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