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| Titel |
Harmonisation of GOME, SCIAMACHY and GOME-2 ozone cross-sections |
| VerfasserIn |
Anna Serdyuchenko, Victor Gorshelev, Mark Weber, Wissam Chehade, John Burrows |
| 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 |
250056924
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| Zusammenfassung |
| The goal of the current work is to derive a consolidated and consistent set of absorption
cross-sections in the UV/visible/NIR spectral region for satellite spectrometers. The
harmonization of cross-sections is carried out by a combination of re-evaluation of the
pre-flight laboratory measured cross-sections with the satellite flight–model (FM)
spectrometers and new experimental work to improve the absolute scaling of the available
cross-section data.
The generation of long-term datasets of atmospheric trace gases is a major need and
prerequisite for climate and air quality related studies. In particular ozone is an important
species in the stratosphere (UV protection) and troposphere (air pollution, climate gas). The
global monitoring capabilities of satellite borne atmospheric chemistry sensors play a unique
role in the determination of long term trends.
Currently there are three atmospheric chemistry instruments with a high potential of
synergy in orbit: the Global Ozone Measuring Experiment (GOME) on the board of ERS
satellite, the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography
(SCIAMACHY) on Envisat, and GOME-2 on Met-Op. Two more satellites, each carrying a
GOME-2 spectrometer are planned to be launched five years apart in the next decade. It will
result in a time series covering two or more decades of ozone observations. As the lifetime of
individual satellite missions is limited, information from different sensors needs to be
combined.
Ozone absorption cross-.sections are measured with an echelle spectrometer and a Fourier
transform spectrometer to cover a broad range of wavelengths from 220 nm to
about 1 mkm. Spectral resolution of the new spectra varies from about 0.02 nm
FWHM in UV to 0.5 nm at 1 mkm. Special attention is paid to the requirement for the
precision of the absolute values of cross-sections (better than 2%), particularly
in the DOAS window (325-335 nm). In addition, attention is paid to the accurate
measurements of the temperature dependence of the cross-sections in 200-300K
range.
Based on the results of this work, it is expected that the ozone data quality and time series
will improve significantly as required for climate, air quality, and stratospheric ozone trend
studies. As a delivery updated ozone cross-sections will be available for reprocessing
with GOME, SCIAMACHY and GOME2 and to the scientific community as well. |
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