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Titel |
Observations of Carbon Monoxide in the Marian Atmosphere - the comparison of the measurements done by SW PFSMEX and HIFI on Herschel in the period 11-16 of April 2010 |
VerfasserIn |
Maria I. Blecka, Giuseppe Sindoni, Paul Hartogh, Christopher Jarchow, Emmanuel Lellouch |
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 |
250056852
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Zusammenfassung |
We report the analysis of Herschel/HIFI and PFS/MEX observations of the Martian
atmosphere performed between 11 and 16 of April 2010.
From HIFI observations we selected the (7-6) rotational transitions of the isotopes 13CO
and C18O at 771 and 768 GHZ respectively in order to retrieve the mean volume mixing ratio
of carbon monoxide.
The Planetary Fourier Spectrometer (PFS) an instrument optimized for atmospheric
studies covers the spectral range from 1.2 to 45μm and consist of two channels: the Short
Wavelength Channel (SW), which measures the reflected light from the planet, and the Long
Wavelength Channel (LW), which is sensitive to the emitted light from the planet surface. In
this work we present the result of CO concentration in the Mars atmosphere using
spectra acquired by the PFS SW channel. To reach a good signal we excluded the
instrumental effects in spectra and the mean spectra were build. We have retrieved CO
mixing ratios at 4235cm-1 band from some mean spectra of orbits 8039, 8040 and
8049.
The spectral bands and lines observed by both instruments have been modeled using a
radiative transfer code: Mars was assumed as a sphere surrounded by a concentric
atmospheric layers. Within each layer the atmospheric temperature, pressure and volume
mixing ratio have been assumed constant. The surface continuum emission was modeled as a
blackbody emission with temperatures depend on geometry.
The carbon monoxide mixing ratio from HIFI data was determined to be 980±150 ppm
from PFS SW is situated in the range about 400-1600 ppm with the error about
20%.
The work was supported by the grants MNiSW: 123/N-ESA/2008/0;
181/N-HSO/2008/0
References:G. Sindoni, V. Formisano, A. Geminale, Observations of water vapour and
carbon monoxide in the Martian atmosphere with the SWC of PFS/MEX, in press PSS
2011
P. Hartogh, M. I. Blecka, C. Jarchow et al. First results on martian carbon monoxide from
Herschel/HIFI Observations, Astronomy & Astrophysics, July 9, 2010 |
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