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| Titel |
Investigating the influence of horizontal inhomogeneity on the MAX-DOAS retrieval of trace gases and aerosols |
| VerfasserIn |
Julia Remmers, Steffen Beirle, Thomas Wagner |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149835
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| Publikation (Nr.) |
 EGU/EGU2017-14228.pdf |
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| Zusammenfassung |
| The MAXDOAS (Multi-AXis Differential Optical Absorption Spectroscopy) method is used
for many years to retrieve vertical profiles of trace gases (e.g. NO2, HCHO, SO2) and
aerosols. With the new generation of instruments with variable azimuth angle pointing it is
thus generally possible to gain information about the 3D spatial distribution of aerosols and
trace gases. For this work data is used from the MADCAT campaign, which took place in
Mainz, Germany, in summer 2013.
The light path is heavily influenced by the profile of aerosols, therefore the retrieval is
performed in two steps: first the aerosol profile is retrieved, then this information is used to
gain the trace gas profile. We use a parameterized retrieval called Π-MAX (Profile Inversion
for MAX-DOAS measurements). Up to now the aerosol is assumed to be horizontally
homogeneous distributed. As a first step we will now calculate the aerosol profiles in different
azimuthal directions to estimate the strength of the inhomogeneity regarding the aerosols.
These results are then used to investigate and estimate the influence on the trace gas
retrieval.
The aerosol profiles retrieved with Π-MAX are compared to ceilometer measurements and
sun photometer measurements on the site. |
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