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| Titel |
Retrieval of Vertical Profiles of Trace Gases and Aerosols using the HEIPRO Algorithm: An Overview |
| VerfasserIn |
Udo Frieß, Selami Yilmaz, Ulrich Platt |
| 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 |
250088112
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| Publikation (Nr.) |
 EGU/EGU2014-2188.pdf |
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| Zusammenfassung |
| During recent years, Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS)
has found a growing number of applications for the retrieval of vertical profile information of
atmospheric constituents. MAX-DOAS instruments measure the differential slant column
density (dSCD) of trace gases along several lines of sight between the zenith and the horizon
using spectroscopic techniques. The conversion of dSCDs to vertical profiles of
aerosols and trace gases represents an inverse problem which can be solved using
appropriate retrieval algorithms in conjunction with radiative transfer models. Usually, the
retrieval is performed in a two-step process where aerosol extinction profiles (and
potentially also aerosol optical or microphysical properties) are retrieved from the
dSCDs of an absorber with known vertical profiles (usually the oxygen collision
complex O4) in a first step, and in a second step trace gas vertical profiles are retrieved
using the observed trace gas dSCDs together with the aerosol profiles from the first
step.
Here we present the Heidelberg profile retrieval algorithm (HEIPRO) for the retrieval of
trace gas and aerosol vertical profiles from MAX-DOAS measurements. HEIPRO is based on
the well-established optimal estimation technique with the SCIATRAN radiative transfer
scheme as forward model. The versatility of the algorithm will be demonstrated on the basis
of ground-based and airborne data from several campaigns (EUCAARI, CINDI, OASIS-IPY,
Bromex, and others) reaching from mid-latitudes to Polar Regions, and the vertical sensitivity
and information content will be discussed. The vertical profiles retrieved from MAX-DOAS
will be compared to co-located aerosol and trace gas instrumentation, such as LIDAR, sun
photometer, nephelometer and in situ trace gas measurements. Finally, an outlook on
possible future improvements in the retrieval methods and the instrumentation will be
provided. |
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