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| Titel |
The NOMAD Spectrometer Suite on ExoMars Trace Gas Orbiter |
| VerfasserIn |
Ann Carine Vandaele, Jose-Juan Lopez-Moreno, Manish R. Patel, Giancarlo Bellucci, Eddy Neefs, Ian R. Thomas, Rachel Drummond, Julio Rodriguez-Gomez, Frank Daerden |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250123867
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| Publikation (Nr.) |
 EGU/EGU2016-3194.pdf |
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| Zusammenfassung |
| NOMAD (Nadir and Occultation for MArs Discovery) is a suite of three high-resolution
spectrometers on-board the ExoMars Trace Gas Orbiter. The instrument will be able to detect
and map a wide variety of Martian gases in unprecedented detail.
NOMAD’s three spectrometers cover the UV-visible (UVIS channel - 200-650nm) and
infrared ranges (SO and LNO channels - 2.2-4.3μm), operating in solar occultation, limb and
nadir-viewing modes, generating a huge dataset of Martian atmospheric observations during
the mission across a wide spectral range.
NOMAD has the resolving power to identify many trace gases that exhibit absorption
features within the spectral range of the three channels. The order-of-magnitude increase in
spectral resolution over previous instruments will enable spatial and temporal mapping of
several isotopologues of methane and water, providing important measurements of the
Martian D/H and methane isotope ratios globally. Sensitivity studies have shown that, using
expected SNR values, NOMAD should have the ability to measure methane concentrations
<25 parts per trillion (ppt) in solar occultation mode, and 11 parts per billion in nadir
mode. Occultation detections as low at 10 ppt could be made if spectra are averaged
sufficiently.
Using SO and LNO in combination with UVIS, aerosol properties such as optical depth,
composition and size distribution can also be derived. NOMAD will also continue to monitor
the major seasonal cycles on Mars, extending existing datasets made by successive space
missions in the past decade. |
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