Fast back-reactions of shock-released CO 2 from carbonates: an experimental approach

Agrinier, Pierre; Deutsch, Alexander; Schärer, Urs; Martínez, Isabelle

doi:10.1016/s0016-7037(01)00617-2

Cited by 74 publications

(95 citation statements)

References 51 publications

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“…(iii) The amounts of H 2 SO 4 reaching the surface ocean were probably at least twofold less than the early estimates of the amounts of S released, because they ignored rapid back-reactions consuming sulfur in the plume (22). (iv) The release of S to the atmosphere may have been accompanied by a production of lime (CaO) (22) and/or other basic compounds (30), which if subsequently falling into the surface ocean may have dissolved there, raising Ω calcite and pH.…”

Section: Discussionmentioning

confidence: 94%

“…According to this equation there was also a simultaneous equimolar production of base (in the form of lime, CaO), some of which could have counteracted the effects of the acid (22). However, consistent with our goal of estimating maximum possible impacts, our simulations did not include either lime effects on pH or the possible loss of SO 3 through recombining with CaO within the plume to reform solid CaSO 4 (22,23).…”

Section: Resultsmentioning

confidence: 99%

“…However, consistent with our goal of estimating maximum possible impacts, our simulations did not include either lime effects on pH or the possible loss of SO 3 through recombining with CaO within the plume to reform solid CaSO 4 (22,23).…”

Section: Resultsmentioning

confidence: 99%

“…It has been estimated that an asteroid of diameter ∼10 km hitting the 3-or 4-km-thick layer of sedimentary carbonates of the Yucatan peninsula (19) would have released between about 5,000 and 9,000 Pg CO 2 (32), or in other words 1,300-2,500 Pg carbon. This may, however, be an overestimate, because the total amount released was most likely greatly reduced by rapid back-reactions (33) in which 40-80% of volatilized CaO and CO 2 immediately recombined within the plume to reform CaCO 3 (22). As for sulfur, we do not include this or lime effects on pH in the model calculations.…”

Section: Resultsmentioning

confidence: 99%

“…Additional uncertainty comes from lack of complete knowledge about the nature of the impact site geology and more specifically the amount of gypsum in the impacted rocks. Another source of uncertainty is that most estimates assume that 100% of the volatilized sulfur ended up as sulfuric acid added to the ocean, whereas others take into consideration that about 50% (22,23) may have been reincorporated almost immediately back into solid CaSO 4 .…”

Section: Discussionmentioning

confidence: 99%

See 4 more Smart Citations

Severity of ocean acidification following the end-Cretaceous asteroid impact

Tyrrell

Merico

McKay

2015

Proc. Natl. Acad. Sci. U.S.A.

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Most paleo-episodes of ocean acidification (OA) were either too slow or too small to be instructive in predicting near-future impacts. The end-Cretaceous event (66 Mya) is intriguing in this regard, both because of its rapid onset and also because many pelagic calcifying species (including 100% of ammonites and more than 90% of calcareous nannoplankton and foraminifera) went extinct at this time. Here we evaluate whether extinction-level OA could feasibly have been produced by the asteroid impact. Carbon cycle box models were used to estimate OA consequences of (i) vaporization of up to 60 × 10 15 mol of sulfur from gypsum rocks at the point of impact; (ii) generation of up to 5 × 10 15 mol of NO x by the impact pressure wave and other sources; (iii) release of up to 6,500 Pg C as CO 2 from vaporization of carbonate rocks, wildfires, and soil carbon decay; and (iv) ocean overturn bringing high-CO 2 water to the surface. We find that the acidification produced by most processes is too weak to explain calcifier extinctions. Sulfuric acid additions could have made the surface ocean extremely undersaturated (Ω calcite <0.5), but only if they reached the ocean very rapidly (over a few days) and if the quantity added was at the top end of literature estimates. We therefore conclude that severe ocean acidification might have been, but most likely was not, responsible for the great extinctions of planktonic calcifiers and ammonites at the end of the Cretaceous.ocean acidification | asteroid impact | K/Pg boundary | mass extinction

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Section: Discussionmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Severity of ocean acidification following the end-Cretaceous asteroid impact

Tyrrell

Merico

McKay

2015

Proc. Natl. Acad. Sci. U.S.A.

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Impact Melting

et al. 2012

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Hydrogen Production Integrated with Simultaneous CO₂ Sequestration on Fly Ashes from Power Plants

Molga

Cherbański

2011

Chem Eng & Technol

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Integration of chemical reactions with in situ adsorptive separation of one of the reaction products helps to improve the reactant conversion or/and product selectivity. In the steam‐methane reforming (SMR) process, despite a reversibility of employed reactions, the in situ adsorption of CO2 enables an almost total conversion of methane and produced CO, so pure hydrogen can be obtained directly from a single‐step adsorptive reactor. However, the main problem in practical application of such integrated process is a saturation of sorbent with CO2 and the need of its cyclic regeneration. A series of experiments to determine the kinetics for CO2 sorption on fly ashes were performed under operating conditions usually applied for the sorption‐enhanced SMR process and the possible CO2 uptake was estimated. The obtained results indicate that fly ashes can be utilized as an efficient and cheap sorbent for the considered hydrogen production process.

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Fast back-reactions of shock-released CO 2 from carbonates: an experimental approach

Cited by 74 publications

References 51 publications

Severity of ocean acidification following the end-Cretaceous asteroid impact

Severity of ocean acidification following the end-Cretaceous asteroid impact

Impact Melting

Hydrogen Production Integrated with Simultaneous CO₂ Sequestration on Fly Ashes from Power Plants

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Fast back-reactions of shock-released CO 2 from carbonates: an experimental approach

Cited by 74 publications

References 51 publications

Severity of ocean acidification following the end-Cretaceous asteroid impact

Severity of ocean acidification following the end-Cretaceous asteroid impact

Impact Melting

Hydrogen Production Integrated with Simultaneous CO2 Sequestration on Fly Ashes from Power Plants

Contact Info

Product

Resources

About

Hydrogen Production Integrated with Simultaneous CO₂ Sequestration on Fly Ashes from Power Plants