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Theses

Apports du sondage infrarouge à l'étude des aérosols atmosphériques

Abstract : The 2001 report from the Intergovernmental Panel on Climate Change emphasized the very low level
of understanding of atmospheric aerosol effects on climate. These particles originate either from
natural sources (dust, volcanic aerosols...) or from anthropogenic sources (sulfates, soot...). They are
one of the main sources of uncertainty on climate change, partly because they show a very high
spatio-temporal variability. Observation from space, being global and quasi-continuous, is therefore a
first importance tool for aerosol studies.
Remote sensing in the visible domain has been widely used to obtain a better characterization of these
particles and their effect on solar radiation. On the opposite, remote sensing of aerosols in the infrared
domain still remains marginal. Yet, not only the knowledge of the effect of aerosols on terrestrial
radiation is needed for the evaluation of their total radiative forcing, but also infrared remote sensing
provides a way to retrieve other aerosol characteristics (observations are possible at night and day,
over land and sea).
In this PhD dissertation, we show that aerosol optical depth, altitude and size can be retrieved from
infrared sounder observations. We first study the sensitivity of aerosol optical properties to their
microphysical properties, we then develop a radiative transfer code for scattering medium adapted to
the very high spectral resolution of the new generation sounder NASA-Aqua/AIRS, and we finally
focus on the inverse problem. The applications shown here deal with Pinatubo stratospheric volcanic
aerosol, observed with NOAA/HIRS, and with the building of an 8 year climatology of dust over sea
and land from this sounder. Finally, from AIRS observations, we retrieve the optical depth at 10 μm,
the average altitude and the coarse mode effective radius of mineral dust over sea.
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https://tel.archives-ouvertes.fr/tel-00011661
Contributor : Clémence Pierangelo <>
Submitted on : Tuesday, February 28, 2006 - 9:44:37 AM
Last modification on : Monday, December 14, 2020 - 9:51:12 AM
Long-term archiving on: : Saturday, April 3, 2010 - 8:44:14 PM

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  • HAL Id : tel-00011661, version 1

Citation

Clémence Pierangelo. Apports du sondage infrarouge à l'étude des aérosols atmosphériques. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00011661⟩

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