KIT | KIT-Bibliothek | Impressum | Datenschutz

Retrieval of Martian Atmospheric CO Vertical Profiles From NOMAD Observations During the First Year of TGO Operations

Modak, Ashimananda ; López-Valverde, Miguel Angel; Brines, Adrian; Stolzenbach, Aurélien; Funke, Bernd; González-Galindo, Francisco; Hill, Brittany; Aoki, Shohei; Thomas, Ian; Liuzzi, Giuliano; Villanueva, Gerónimo; Erwin, Justin; Lopez Moreno, José Juan; Yoshida, Nao; Grabowski, Udo 1; Forget, Francois; Daerden, Frank; Ristic, Bojan; Bellucci, Giancarlo; ... mehr

Abstract (englisch):

We present CO density profiles up to about 100 km in the Martian atmosphere obtained for the first time from retrievals of solar occultation measurements by the Nadir and Occultation for Mars Discovery (NOMAD) onboard ExoMars Trace Gas Orbiter (TGO). CO is an important trace gas on Mars, as it is controlled by CO2 photolysis, chemical reaction with the OH radicals, and the global dynamics. However, the measurements of CO vertical profiles have been elusive until the arrival of TGO. We show how the NOMAD CO variations describe very well the Mars general circulation. We observe a depletion of CO in the upper troposphere and mesosphere during the peak period, LS = 190°–200°, more pronounced over the northern latitudes, confirming a similar result recently reported by Atmospheric Chemistry Suite onboard TGO. However, in the lower troposphere around 20 km, and at least at high latitudes of the S. hemisphere, NOMAD CO mixing ratios increase over 1,500 ppmv during the GDS (Global Dust Storm) onset. This might be related to the downwelling branch of the Hadley circulation. A subsequent increase in tropospheric CO is observed during the decay phase of the GDS around LS = 210°–250° when the dust loading is still high. ... mehr

DOI: 10.1029/2022JE007282
Zitationen: 5
Zitationen: 5
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 07.03.2023
Sprache Englisch
Identifikator ISSN: 2169-9097, 2169-9100
KITopen-ID: 1000156550
HGF-Programm 12.11.25 (POF IV, LK 01) Atmospheric composition and circulation changes
Erschienen in Journal of Geophysical Research: Planets
Verlag John Wiley and Sons
Band 128
Heft 3
Seiten Art.: e2022JE007282
Bemerkung zur Veröffentlichung This article also appears in: ExoMars Trace Gas Orbiter: One Martian Year of Science.
Vorab online veröffentlicht am 11.02.2023
Schlagwörter Mars Atmosphere CO NOMAD TGO RCP KOPRA IAA IMK-ASF-SAT
Nachgewiesen in Web of Science
Relationen in KITopen
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page