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Patel, M. R.; Sellers, G.; Mason, J.; Holmes, J.A.; Brown, M. A. J.; Lewis, S. R.; Rajendran, K.; Streeter, P. M.; Marriner, C.; Hathi, B. D.; Slade, D. J.; Leese, M. R.; Wolff, M. J.; Khayat, A. S. J.; Smith, M. D.; Aoki, S.; Piccialli, A.; Vandaele, A. C.; Robert, S.; Daerden, F.; Thomas, I. R.; Ristic, B.; Willame, Y.; Depiesse, C.; Bellucci, G. and Lopez‐Moreno, J.‐J.
(2021).
DOI: https://doi.org/10.1029/2021je006837
Abstract
We present ∼1.5 Mars Years (MY) of ozone vertical profiles, covering LS = 163° in MY34 to LS = 320° in MY35, a period which includes the 2018 global dust storm. Since April 2018, the Ultraviolet and Visible Spectrometer (UVIS) channel of the Nadir and Occultation for Mars Discovery (NOMAD) instrument aboard the ExoMars Trace Gas Orbiter has observed the vertical, latitudinal and seasonal distributions of ozone. Around perihelion, the relative abundance of both ozone and water (from coincident NOMAD measurements) increases with decreasing altitude below ∼40 km. Around aphelion, localised decreases in ozone abundance exist between 25-35 km coincident with the location of modelled peak water abundances. High latitude (> ± 55°), high altitude (40-55 km) equinoctial ozone enhancements are observed in both hemispheres (LS ∼350-40°) and discussed in the companion paper to this work (Khayat et al, 2021). The descending branch of the main Hadley cell shapes the observed ozone distribution at LS = 40-60°, with the possible signature of a northern hemisphere thermally indirect cell identifiable from LS = 40-80°. Morning terminator observations show elevated ozone abundances with respect to evening observations, with average ozone abundances between 20 and 40 km an order of magnitude higher at sunrise compared to sunset, attributed to diurnal photochemical partitioning along the line of sight between ozone and O or fluctuations in water abundance. The ozone retrievals presented here provide the most complete global description of Mars ozone vertical distributions to date as a function of season and latitude.
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- Item ORO ID
- 79931
- Item Type
- Journal Item
- ISSN
- 2169-9100
- Project Funding Details
-
Funded Project Name Project ID Funding Body Not Set ST/P001262/1 UK Space Agency (UKSA) Not Set ST/V005332/1 UK Space Agency (UKSA) Not Set ST/S00145X/1 UK Space Agency (UKSA) Not Set ST/R001405/1 UK Space Agency (UKSA) Not Set ST/V002295/1 UK Space Agency (UKSA) Not Set ST/N50421X/1 Science and Technology Facilities Council (STFC) PhD studentship Not Set The Open University (OU) European Union's Horizon 2020 (RoadMap project) 101004052 European Union - Keywords
- Solar occultation; ultraviolet observations; Mars; spectroscopy; ozone; ExoMars
- Academic Unit or School
-
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Copyright Holders
- © 2021 M.R. Patel et al.
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