Expected Performances of the NOMAD/ExoMars instrument

Robert, S.; Vandaele, A.C.; Thomas, I.; Willame, Y.; Daerden, F.; Delanoye, S.; Depiesse, C.; Drummond, R.; Neefs, E.; Neary, L.; Ristic, B.; Mason, J.; Lopez-Moreno, J.-J.; Rodriguez-Gomez, J.; Patel, M. R.; Bellucci, G. and The NOMAD Team, . (2016). Expected Performances of the NOMAD/ExoMars instrument. Planetary And Space Science, 124 pp. 94–104.

DOI: https://doi.org/10.1016/j.pss.2016.03.003


NOMAD (Nadir and Occultation for MArs Discovery) is one of the four instruments on board the ExoMars Trace Gas Orbiter, scheduled for launch in March 2016. It consists of a suite of three high-resolution spectrometers – SO (Solar Occultation), LNO (Limb, Nadir and Occultation) and UVIS (Ultraviolet and Visible Spectrometer). Based upon the characteristics of the channels and the values of Signal-to-Noise Ratio obtained from radiometric models discussed in [Vandaele et al., Optics Express, 2015] and [Thomas et al., Optics Express, 2015], the expected performances of the instrument in terms of sensitivity to detection have been investigated. The analysis led to the determination of detection limits for 18 molecules, namely CO, H2O, HDO, C2H2, C2H4, C2H6, H2CO, CH4, SO2, H2S, HCl, HCN, HO2, NH3, N2O, NO2, OCS, O3. 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 as 10 ppt could be made if spectra are averaged [Drummond et al., Planetary Space and Science, 2011]. Results have been obtained for all three channels in nadir and in solar occultation.

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  • Item ORO ID
  • 45619
  • Item Type
  • Journal Item
  • ISSN
  • 0032-0633
  • Project Funding Details
  • Funded Project NameProject IDFunding Body
    NOMADNot SetESA Prodex Office
    Interuniversity Attraction PolesNot SetPlanet TOPERS
    Interuniversity Attraction PolesBR/143/A2/SCOOPBRAIN
    Seventh Framework ProgrammeFP7/2007-2013European Community
    Not SetST/I003061/1UK Space Agency
  • Keywords
  • ExoMars ESA mission; NOMAD instrument; Mars; atmosphere; Abundances; Radiative transfer
  • Academic Unit or School
  • Other Departments > Other Departments
  • Copyright Holders
  • © 2016 Elsevier
  • Depositing User
  • Manish Patel