Atmospheric Aerosols
Mostrando 25-36 de 36 artigos, teses e dissertações.
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25. Estudos dos efeitos atmosfericos sobre as radiacoes percebidas pelos sensores a bordo de plataformas orbitais (ERTS/LANDSAT) / Studies of atmospheric effects over radiations perceived by the radar on board an orbital platforms (ERTS/LANDSAT)
The solar radiation reflected by targets on the earth s surface interacts with the atmosphere before being detected by the satellite sensors. In the visible wavelenght region, scattering by molecules and aerosols predominates on the interaction of the radiation with the atmosphere. In addition to attenuation, this interaction also contributes with diffuse ra
Publicado em: 1978
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26. Atmospheric brown clouds: Impacts on South Asian climate and hydrological cycle
South Asian emissions of fossil fuel SO2 and black carbon increased≈6-fold since 1930, resulting in large atmospheric concentrations of black carbon and other aerosols. This period also witnessed strong negative trends of surface solar radiation, surface evaporation, and summer monsoon rainfall. These changes over India were accompanied by an increase in a
National Academy of Sciences.
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27. Atmospheric aerosols as prebiotic chemical reactors
Aerosol particles in the atmosphere have recently been found to contain a large number of chemical elements and a high content of organic material. The latter property is explicable by an inverted micelle model. The aerosol sizes with significant atmospheric lifetimes are the same as those of single-celled organisms, and they are predicted by the interp
The National Academy of Sciences.
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28. Global atmospheric black carbon inferred from AERONET
AERONET, a network of well calibrated sunphotometers, provides data on aerosol optical depth and absorption optical depth at >250 sites around the world. The spectral range of AERONET allows discrimination between constituents that absorb most strongly in the UV region, such as soil dust and organic carbon, and the more ubiquitously absorbing black carbo
National Academy of Sciences.
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29. Dispersal of Aspergillus fumigatus from Sewage Sludge Compost Piles Subjected to Mechanical Agitation in Open Air
Aerosolization of the thermophilous fungal opportunist Aspergillus fumigatus from mechanically agitated compost piles was examined at a pilot-scale sewage sludge composting facility and two other selected test sites. Aerosols of A. fumigatus downwind from stationary compost piles were insignificant in comparison with those downwind from agitated piles. These
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30. On the interactions between atmospheric radicals and cloud droplets: A molecular picture of the interface
How gas-phase materials become incorporated with cloud droplets has been an intriguing subject for decades, and considerable work has been done to understand the interactions between closed-shell molecules and liquid water. The interactions between open-shell radical species and liquid-phase cloud droplets, however, are not well understood. To probe thes
National Academy of Sciences.
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31. Case study of the effects of atmospheric aerosols and regional haze on agriculture: An opportunity to enhance crop yields in China through emission controls?
The effect of atmospheric aerosols and regional haze from air pollution on the yields of rice and winter wheat grown in China is assessed. The assessment is based on estimates of aerosol optical depths over China, the effect of these optical depths on the solar irradiance reaching the earth’s surface, and the response of rice and winter wheat grown in Nanj
The National Academy of Sciences.
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32. An atmospheric pCO2 reconstruction across the Cretaceous-Tertiary boundary from leaf megafossils
The end-Cretaceous mass extinctions, 65 million years ago, profoundly influenced the course of biotic evolution. These extinctions coincided with a major extraterrestrial impact event and massive volcanism in India. Determining the relative importance of each event as a driver of environmental and biotic change across the Cretaceous-Tertiary boundary (KTB) c
The National Academy of Sciences.
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33. Effects of inhalation of an artificial fog
Atmospheric fog plays some role in the production of symptoms in chronic bronchitis, but hitherto the blame has rested with pollutants rather than with the water droplet content itself. An investigation of the effects of an artificial water-containing fog at room temperature on the F.E.V.1·0 of seven patients with chronic bronchitis showed a significant red
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34. Airborne minerals and related aerosol particles: Effects on climate and the environment
Aerosol particles are ubiquitous in the troposphere and exert an important influence on global climate and the environment. They affect climate through scattering, transmission, and absorption of radiation as well as by acting as nuclei for cloud formation. A significant fraction of the aerosol particle burden consists of minerals, and most of the remai
The National Academy of Sciences.
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35. Climate forcings in the Industrial era
The forcings that drive long-term climate change are not known with an accuracy sufficient to define future climate change. Anthropogenic greenhouse gases (GHGs), which are well measured, cause a strong positive (warming) forcing. But other, poorly measured, anthropogenic forcings, especially changes of atmospheric aerosols, clouds, and land-use pattern
The National Academy of Sciences.
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36. Toward elimination of discrepancies between theory and experiment: The rate constant of the atmospheric conversion of SO3 to H2SO4
The hydration rate constant of sulfur trioxide to sulfuric acid is shown to depend sensitively on water vapor pressure. In the 1:1 SO3-H2O complex, the rate is predicted to be slower by about 25 orders of magnitude compared with laboratory results [Lovejoy, E. R., Hanson, D. R. & Huey, L. G. (1996) J. Phys. Chem. 100, 19911–19916; Jayne, J. T., Pöschl, U.
The National Academy of Sciences.