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| Titel |
Long-term MAX-DOAS measurement of aerosol and trace gases in the
Environmental Research Station Schneefernerhaus, Germany |
| VerfasserIn |
Zhuoru Wang, Nan Hao, Francois Hendrick, Michel Van Roozendael, Udo Frieß, Robert Holla, Adrian Doicu, Thomas Trautmann |
| 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 |
250146817
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| Publikation (Nr.) |
 EGU/EGU2017-10862.pdf |
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| Zusammenfassung |
| The Environmental Research Station Schneefernerhaus (Umwelt Forschungsstation
Schneefernerhaus, UFS) is located immediately under the summit of Zugspitze (2962 m), the
highest mountain of Germany, at a height of 2650 m. The UFS is a rare observation site in
Germany with mostly clean and unpolluted air. It is ideal for both stratospheric composition
measurements and trace gas measurements in the free-troposphere. It is optimal for detecting
pollution events in the free-troposphere, which are indications of short- or long-range
transport of air pollutants.
A MAX-DOAS instrument has been working in the UFS since February 2011. With the
zenith spectrum of each cycle used as the reference, the differential slant column densities
(DSCDs) of trace gases are calculated from the spectra with Differential Optical Absorption
Spectroscopy (DOAS) method. The DSCDs of both O4 and NO2 are calculated in two
different wavelength intervals, 338-370 nm in the UV region and 440-490 nm in the
VIS region. For HCHO and other trace gases, optimal fitting windows have been
determined.
The aerosol vertical profiles and AODs are derived from O4 DSCDs using both the
bePRO retrieval algorithm and the HEIPRO retrieval algorithm. The two algorithms are both
based on the optimal estimation technique. BePRO uses the LIDOR radiative transfer model
as the forward model, while HEIPRO uses the SCIATRAN radiative transfer model. The
vertical column densities (VCDs) as well as vertical profiles of trace gases are then derived
from the DSCDs of trace gases and the aerosol profiles, also using both bePRO and
HEIPRO.
This work presents the results of the MAX-DOAS measurement in the UFS from 2012 to
2016, including aerosol, NO2, and HCHO, etc. The vertical profiles as well as the seasonal
and diurnal variation patterns of tropospheric aerosol and trace gases will be shown. The
cloud screening method based on the MAX-DOAS measurement in the UFS will also be
discussed. In the end, high NO2 episodes in the UFS due to long range transport of air
pollutants will be presented. |
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