Results 21 to 30 of about 824,380 (294)

The effect of the Pliocene temperature pattern on silicate weathering and Pliocene–Pleistocene cooling [PDF]

Climate of the Past, 2023
The warmer early Pliocene climate featured changes to global sea surface temperature (SST) patterns, namely a reduction in the Equator–pole gradient and the east–west SST gradient in the tropical Pacific, the so-called “permanent El Niño”.
P. Maffre, J. C. H. Chiang, N. L. Swanson-Hysell   +2 more
doaj   +1 more source

Is the climate change mitigation effect of enhanced silicate weathering governed by biological processes?

Global Change Biology, 2021
A number of negative emission technologies (NETs) have been proposed to actively remove CO2 from the atmosphere, with enhanced silicate weathering (ESW) as a relatively new NET with considerable climate change mitigation potential.
S. Vicca, D. Goll, M. Hagens, J. Hartmann, I. Janssens, A. Neubeck, J. Peñuelas, Sílvia Poblador, Jet Rijnders, J. Sardans, E. Struyf, P. Swoboda, J. V. van Groenigen, Arthur Vienne, E. Verbruggen   +14 more
semanticscholar   +1 more source

Sulfate sulfur isotopes and major ion chemistry reveal that pyrite oxidation counteracts CO2 drawdown from silicate weathering in the Langtang-Trisuli-Narayani River system, Nepal Himalaya

Geochimica et Cosmochimica Acta, 2021
Drawdown of atmospheric carbon dioxide (CO₂) due to silicate weathering in the Himalaya has previously been implicated in Cenozoic cooling. However, over timescales shorter than that of the removal of marine sulfate (SO₄²⁻), the oxidation of pyrite (FeS₂)
P. Kemeny, G. Lopez, N. Dalleska, M. Torres, A. Burke, M. Bhatt, A. West, J. Hartmann, J. Adkins   +8 more
semanticscholar   +1 more source

Reactive-transport modeling of neodymium and its radiogenic isotope in deep-sea sediments: The roles of authigenesis, marine silicate weathering and reverse weathering

Earth and Planetary Science Letters, 2022
Dissolved Rare Earth Elements (REE) and radiogenic neodymium (Nd) isotope composition ( ε Nd ) of seawater are widely used geochemical tools in studying marine processes, but their modern ocean budgets are poorly understood.
Jianghui Du, B. Haley, A. Mix, A. Abbott, J. McManus, D. Vance   +5 more
semanticscholar   +1 more source

Deriving Nickel (Ni(II)) and Chromium (Cr(III)) Based Environmentally Safe Olivine Guidelines for Coastal Enhanced Silicate Weathering.

Environmental Science and Technology, 2021
Enhanced silicate weathering (ESW) by spreading finely ground silicate rock along the coastal zone to remove atmospheric carbon dioxide (CO2) is a proposed climate change mitigation technique. The abundant and fast-dissolving mineral olivine has received
G. Flipkens, R. Blust, R. Town
semanticscholar   +1 more source

Enhanced silicate weathering is not limited by silicic acid saturation [PDF]

Proceedings of the National Academy of Sciences, 2011
Enhanced weathering of olivine as a means of sequestering carbon is investigated by Kohler et al. (1). Specifically, the study discusses the potential distribution of fine olivine powder, obtained from dunite mines, in the humid tropic regions of the Amazon and Congo River catchments. Olivine (forsterite) dissolution (Eq.
Schuiling, R.D., Wilson, S.A., Power, I.M.   +2 more
openaire   +3 more sources

Weak impact of microorganisms on Ca, Mg-bearing silicate weathering

npj Materials Degradation, 2021
Assessment of the microbial impact on mineral dissolution is crucial for a predictive understanding of basic (Ca, Mg bearing) silicate weathering and the associated CO 2 consumption, bioerosion, and CO 2 storage in basaltic rocks.
O. Pokrovsky, L. Shirokova, S. Zabelina, Guntram Jordan, P. Bénézeth   +4 more
semanticscholar   +1 more source

Magnesium Isotope Fractionation During Silicate Weathering: Constrains From Riverine Mg Isotopic Composition in the Southeastern Coastal Region of China

Geochemistry, Geophysics, Geosystems, 2022
Mg isotopic composition of river water is dominantly controlled by the dissolution of both silicate and carbonate sources and a series of biogeochemical processes.
Tong Zhao, Wenjing Liu, Zhifang Xu
doaj   +1 more source

Mobile evaporite enhances the cycle of physical–chemical erosion in badlands [PDF]

Earth Surface Dynamics, 2023
Chemical weathering driven by physical erosion is a natural process that strongly affects chemical and solid matter budgets at the Earth's surface. However, the influence of extreme climatic erosion on chemical weathering dynamics is poorly understood ...
C.-J. Yang, C.-J. Yang, P.-H. Chen, E. D. Erlanger, J. M. Turowski, S. Xu, T.-Y. Teng, J.-C. Lin, J.-C. Huang   +8 more
doaj   +1 more source

Direct measurement of fungal contribution to silicate weathering rates in soil

Geology, 2021
Chemical weathering produces solutes that control groundwater chemistry and supply ecosystems with essential nutrients. Although microbial activity influences silicate weathering rates and associated nutrient fluxes, its relative contribution to silicate
B. Wild, G. Imfeld, D. Daval
semanticscholar   +1 more source