 |
| Titel |
A unified approach to infrared aerosol remote sensing and type specification |
| VerfasserIn |
L. Clarisse, P.-F. Coheur, F. Prata, J. Hadji-Lazaro, D. Hurtmans, C. Clerbaux |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 4 ; Nr. 13, no. 4 (2013-02-25), S.2195-2221 |
| Datensatznummer |
250018432
|
| Publikation (Nr.) |
 copernicus.org/acp-13-2195-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Atmospheric aerosols impact air quality and global climate. Space based
measurements are the best way to observe their spatial and temporal
distributions, and can also be used to gain better understanding of their
chemical, physical and optical properties. Aerosol composition is the key
parameter affecting the refractive index, which determines how much radiation
is scattered and absorbed. Composition of aerosols is unfortunately not
measured by state of the art satellite remote sounders. Here we use high
resolution infrared measurements for aerosol type differentiation,
exploiting, in that part of spectrum, the dependency of their refractive
index on wavelength. We review existing detection methods and present
a unified detection method based on linear discrimination analysis. We
demonstrate this method on measurements of the Infrared Atmospheric Sounding
Interferometer (IASI) and five different aerosol types, namely volcanic ash,
windblown sand, sulfuric acid droplets, ammonium sulfate and smoke particles.
We compare these with traditional MODIS AOD measurements. The detection of
the last three types is unprecedented in the infrared in nadir mode, but is
very promising, especially for sulfuric acid droplets which are detected in
the lower troposphere and up to 6 months after injection in the upper
troposphere/lower stratosphere. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|