Results 21 to 30 of about 737,718 (307)
Contribution of liquid, NAT and ice particles to chlorine activation and ozone depletion in Antarctic winter and spring [PDF]
Atmospheric Chemistry and Physics, 2015 Heterogeneous reactions in the Antarctic stratosphere are the cause of chlorine activation and ozone depletion, but the relative roles of different types of polar stratospheric clouds (PSCs) in chlorine activation is an open question.
O. Kirner +3 more
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Chemistry Teacher International, 2023 In this paper, the cooling effect of alternative ice cubes made of granite, soapstone and ceramic is experimentally examined with the help of a digital temperature sensor and compared with that of a conventional ice cube.
Fleischer Timo +3 more
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ICE CHEMISTRY IN STARLESS MOLECULAR CORES [PDF]
The Astrophysical Journal, 2015 Starless molecular cores are natural laboratories for interstellar molecular chemistry research. The chemistry of ices in such objects was investigated with a three-phase (gas, surface, and mantle) model. We considered the center part of five starless cores, with their physical conditions derived from observations. The ice chemistry of oxygen, nitrogen,
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On Simulating the Proton-Irradiation of O$_2$ and H$_2$O Ices Using Astrochemical-type Models, with Implications for Bulk Reactivity [PDF]
, 2019 Many astrochemical models today explicitly consider the species that comprise the bulk of interstellar dust grain ice-mantles separately from those in the top few monolayers. Bombardment of these ices by ionizing radiation - whether in the form of cosmic
Caselli, Paola +3 more
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Glaciochemistry of Cave Ice: Paradana and Snežna Caves, Slovenia
Geosciences, 2019 Cave ice samples collected within karstic terrain have major ion and nutrient concentrations showing that the ice originates from local precipitation modified by the addition of Ca2+ and HCO3− from the dissolution of the local bedrock.
Anne E. Carey +7 more
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Variability in sea ice carbonate chemistry: a case study comparing the importance of ikaite precipitation, bottom-ice algae, and currents across an invisible polynya [PDF]
The Cryosphere, 2022 The carbonate chemistry of sea ice is known to play a role in global carbon cycles, but its importance is uncertain in part due to disparities in reported results.
B. G. T. Else +11 more
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Ice chemistry on the Galilean satellites [PDF]
Journal of Geophysical Research: Planets, 1998 Jupiter's icy satellites Europa, Ganymede, and Callisto are subject to energy fluxes from electrons, photons, and magnetospheric plasma ion bombardment. As water ice and CO2 ice are thought to be present on their surfaces, the radiolysis of these materials over time should produce more complicated CHO‐containing molecules. These may include CH3OH, H2CO,
Mona L. Delitsky, Arthur L. Lane
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Unraveling sulfur chemistry in interstellar carbon oxide ices
Nature Communications, 2022 AbstractFormyl radical (HCO•) and hydroxycarbonyl radical (HOCO•) are versatile building blocks in the formation of biorelevant complex organic molecules (COMs) in interstellar medium. Understanding the chemical pathways for the formation of HCO• and HOCO• starting with primordial substances (e.g., CO and CO2) is of vital importance in building the ...
Xiaolong Li +7 more
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Observational evidence for the convective transport of dust over the central United States [PDF]
, 2016 Bulk aerosol composition and aerosol size distributions measured aboard the DC-8 aircraft during the Deep Convective Clouds and Chemistry Experiment mission in May/June 2012 were used to investigate the transport of mineral dust through nine storms ...
Anderson, B. E. +15 more
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Ice core chemistry of Vestfonna Ice Cap in Svalbard, Norway [PDF]
Journal of Geophysical Research: Atmospheres, 2002 Chemical analyses were done on samples from a 2.2‐m deep snow pit and a 211‐m deep ice core that came from the top of the Vestfonna Ice Cap in Nordaustlandet, Svalbard, Norway. The snow pit samples showed that the temperature increased during the winter owing to advection of warm air from the south, and δ18O did not show a seasonal cycle. Chronology of
Sumito Matoba +4 more
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