Osarita

Los análisis con microsonda electrónica, con elementos puros, aleaciones sintéticas y aleaciones naturales analizadas como standards, dieron Os 35,6, Ru 18,1, Ir 2,0, Ni 1,0, Pt 0,4, Pd 0,6, Rh 0,25 11,S, As 30,6, total 100,0 % (no recalculado).(...

Soot in the stratosphere: The impact of current and HSCT aircraft emissions

One of the trace components of emissions from aircraft engines and other combustion sources are soot particles. These particles are strongly absorbing in the visible and IR spectra, may act as condensation nuclei, and may provide a large surface area for the catalytic promotion of gas-phase chemical reactions. Soot if found throughout the troposphere, even at remote locations, and also in the stratosphere. Present techniques do not allow an unambiguous identification of the sources. This paper discusses the emission of soot from existing and proposed aircraft and the contribution of this soot to concentrations observed in the troposphere and stratosphere. We consider the implications of these emissions for issues in stratospheric physics and chemistry. 11 refs