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| Titel |
Retrieval of aerosol optical depth and vertical distribution using O2 A- and B-band SCIAMACHY observations. |
| VerfasserIn |
Suniti Sanghavi, Jochen Landgraf, Ulrich Platt |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250053634
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| Zusammenfassung |
| The vertical profile of aerosol can provide a clear picture of transport processes, and can be
an indicator of secondary aerosol formation or primary aerosol sources close to the surface.
The vertical extent of clouds and aerosols also governs the sign and magnitude of their net
radiative forcing. From a remote-sensing perspective, retrievals of many trace-gases suffer
from uncertainties due to aerosol and would benefit from co-located information on the
amount and vertical distribution of aerosol loading. Ground-based networks presently provide
much of this information, however their sampling of 3D data is limited due to scarce or
uneven coverage. This motivates the development of methods to retrieve vertical information
on aerosols using satellite data, which offer the advantage of global coverage. SCIAMACHY
onboard ENVISAT provides spectral data at moderate resolution in the UV/VIS
including the O2 A- and B-bands, which contain vertical information due to the
exactly known vertical profile of O2. We make combined use of these bands in an
optimal estimation based algorithm applicable both over bright and dark surfaces
to retrieve the parametrized vertical profile of aerosol, in addition to the optical
thickness and Angstrom exponent from SCIAMACHY data. We present a case study
over Kanpur, India, showing good agreement with coincident AERONET data, and
also capturing seasonal cycles and a periodic wind-blown dust event over Kanpur. |
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