Thermal infrared properties of Titan's stratospheric aerosol

Computer Science

Scientific paper

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Aerosols, Atmospheric Composition, Satellite Atmospheres, Stratosphere, Titan, Atmospheric Chemistry, Clouds (Meteorology), Optical Thickness, Photochemical Reactions

Scientific paper

The monotonic increase with wavenumber of stratospheric IR opacities in the north polar neighborhood of Titan, in the 250-600/cm bandpass, becomes more extreme with decreasing altitude, consistent with an opacity that is primarily dependent on a high altitude photochemical aerosol, on the one hand, but which is moderated by condensed organics at lower altitudes. Because condensates exhibit a wavenumber dependence for opacity which is the opposite of that required, it is suggested that condensed nitriles may be prominent; either of these condensates may be acceptable for sufficiently large particles. While comparisons with low-latitude data indicate no clear dependence of vertically-integrated opacity on latitude above 80 km, indications of a particle size and/or composition gradient with latitude in the lower stratosphere are noted.

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