نتایج جستجو برای: atmospheric oxidation
تعداد نتایج: 192737 فیلتر نتایج به سال:
Molten I-type cosmic spherules formed by heating, oxidation and melting of extraterrestrial Fe,Ni metal alloys. The entire oxygen in these spherules sources from the atmosphere. Therefore, I-type cosmic spherules are suitable tracers for the isotopic composition of the upper atmosphere at altitudes between 80 and 115 km. Here we present data on I-type cosmic spherules collected in Antarctica. T...
Fried Mugil cephalus was investigated under optimal vacuum and atmospheric conditions. The water distribution, texture, color properties of vacuum-fried samples were enhanced compared with atmospheric-fried samples. Meanwhile, frying (VF) reduced the total oil content, protein oxidation, degradation. molecular weight amino acid content suggested that well-preserved during VF. In addition, carbo...
EARTH, ATMOSPHERIC, AND PLANETARY SCIENCES Correction for “Reassessing the atmospheric oxidation mechanism of toluene,” by Yuemeng Ji, Jun Zhao, Hajime Terazono, Kentaro Misawa, Nicholas P. Levitt, Yixin Li, Yun Lin, Jianfei Peng, Yuan Wang, Lian Duan, Bowen Pan, Fang Zhang, Xidan Feng, Taicheng An, Wilmarie Marrero-Ortiz, Jeremiah Secrest, Annie L. Zhang, Kazuhiko Shibuya, Mario J. Molina, and...
Assessment of the reduction methods used to develop chemical schemes: building of a new chemical scheme for VOC oxidation suited to three-dimensional multiscale HOx-NOx-VOC chemistry simulations S. Szopa, B. Aumont, and S. Madronich Laboratoire Interuniversitaire des Systèmes Atmosphériques UMR CNRS 7583, Université Paris 7 et Paris 12, 94010 Créteil Cedex, France National Center for Atmospheri...
Methane is the second most important long-lived greenhouse gas and plays a central role in the chemistry of the Earth’s atmosphere. Nonetheless there are significant uncertainties in its source budget. Analysis of the isotopic composition of atmospheric methane, including the doubly substituted species CH3D, offers new insight into the methane budget as the sources and sinks have distinct isoto...
Sulfate aerosols exert profound impacts on human and ecosystem health, weather, and climate, but their formation mechanism remains uncertain. Atmospheric models consistently underpredict sulfate levels under diverse environmental conditions. From atmospheric measurements in two Chinese megacities and complementary laboratory experiments, we show that the aqueous oxidation of SO2 by NO2 is key t...
Organic peroxy radicals (often abbreviated RO(2)) play a central role in the chemistry of the Earth's lower atmosphere. Formed in the atmospheric oxidation of essentially every organic species emitted, their chemistry is part of the radical cycles that control the oxidative capacity of the atmosphere and lead to the formation of ozone, organic nitrates, organic acids, particulate matter and oth...
The primary sources and atmospheric chemistry of C2-C5 alkanes were incorporated into the atmospheric chemistry general circulation model EMAC. Model output is compared with new observations from the NOAA/ESRL GMD Cooperative Air Sampling Network. Based on the global coverage of the data, two different anthropogenic emission datasets for C4-C5 alkanes, widely used in the modelling community, ar...
Eight distinct hydroxy nitrates are stable products of the first step in the atmospheric oxidation of isoprene by OH. The subsequent chemical fate of these molecules affects global and regional production of ozone and aerosol as well as the location of nitrogen deposition. We synthesized and purified 3 of the 8 isoprene hydroxy nitrate isomers: (E/Z)-2-methyl-4-nitrooxybut-2-ene-1-ol and 3-meth...
The addition mechanism of the OH-initiated oxidation allyl methyl sulfide (AMS) under atmospheric conditions was studied theoretically using both density functional theory (DFT) and SVECV-f12 composite method.
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