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| Titel |
The construction of a 3D aerosol climatology from CALIOP for the improvement of tropospheric trace gas retrievals from satellites |
| VerfasserIn |
Franziska Kreling, Marloes Penning de Vries, Holger Sihler, Steffen Beirle, Thomas Wagner |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089940
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| Publikation (Nr.) |
 EGU/EGU2014-4153.pdf |
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| Zusammenfassung |
| For the correct interpretation of satellite measurements of trace gases, the airmass factor (or
weighting function) of a measurement needs to be well known. This airmass factor depends
on solar and viewing geometry, but is also strongly influenced by clouds and aerosols —
particularly in the troposphere. Differences in assumptions of aerosol amount, profile and
type lead to large errors in trace gas retrievals: for example, the vertical column density of
NO2 over China can vary by a factor of 2 depending on the choice of aerosol parameters.
The attenuated backscatter profile product by the CALIOP lidar team presents an
unprecedented opportunity to improve the airmass factor calculations by including
measured aerosol profiles (as opposed to model data) on a global scale. The profiles
can be combined with MODIS monthly mean aerosol optical depth, which is an
extensively validated product with much better statistics compared to the CALIOP
product.
We here present first attempts at the construction of such a 3D aerosol climatology: Level
1 attenuated backscatter profiles are filtered for contributions from clouds and the surface
using the CALIOP vertical feature mask product. For the purpose of a tropospheric
climatology only data below 8km is used. Furthermore profiles are corrected for Rayleigh
scattering and collocated orbits are averaged. A spatial resolution of 5km along-track and
150m vertically is conceivable, with a time resolution of seasons or even months. |
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