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Optical and physical properties of stratospheric aerosols from balloon measurements in the visible and near-infrared domains. III. Presence of aerosols in the middle stratosphere

Abstract : The aerosol extinction measurements in the ultraviolet and visible wavelengths by the balloonborne spectrometer Spectroscopie d'Absorption Lunaire pour l'Observation des Minoritaires Ozone et NO_x (SALOMON) show that aerosols are present in the middle stratosphere, above 25-km altitude. These observations are confirmed by the extinction measurements performed by a solar occultation radiometer. The balloonborne Laboratoire de Météorologie Dynamique (LMD) counter instrument also confirms the presence of aerosol around 30-km altitude, with an unrealistic excess of micronic particles assuming that only liquid sulfate aerosols are present. An unexpected spectral structure around 640-nm observed by SALOMON is also detectable in extinction measurements by the satellite instrument Stratospheric Aerosols and Gas Experiment III. This set of measurements could indicate that solid aerosols were detected at these altitude ranges. The amount of soot detected up to now in the lower stratosphere is too low to explain these measurements. Thus, the presence of interplanetary dust grains and micrometeorites may need to be invoked. Moreover, it seems that these grains fill the stratosphere in stratified layers.
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https://hal.archives-ouvertes.fr/hal-00110948
Contributor : Cécile Takacs Connect in order to contact the contributor
Submitted on : Thursday, November 2, 2006 - 4:36:59 PM
Last modification on : Tuesday, November 16, 2021 - 4:17:26 AM

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  • HAL Id : hal-00110948, version 1

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Jean-Baptiste Renard, Joëlle Ovarlez, Gwenaël Berthet, Didier Fussen, Filip Vanhellemont, et al.. Optical and physical properties of stratospheric aerosols from balloon measurements in the visible and near-infrared domains. III. Presence of aerosols in the middle stratosphere. Applied optics, Optical Society of America, 2005, 44, pp.4086-4095. ⟨hal-00110948⟩

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