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Explanation the increase in high altitude water on Mars observed by NOMAD during the 2018 global dust storm

Neary, L.; Daerden, F.; Aoki, S.; Whiteway, J.; Clancy, R.T.; Smith, M.; Viscardy, S.; Erwin, J.T.; Thomas, I.R.; Villanueva, G.; Liuzzi, G.; Crismani, M.; Wolff, M.; Lewis, S.R.; Holmes, J.A.; Patel, M.R.; Giuranna, M.; Depiesse, C.; Piccialli, A.; Robert, S.; Trompet, L.; Willame, Y.; Ristic, B. and Vandaele, A.C. (2019). Explanation the increase in high altitude water on Mars observed by NOMAD during the 2018 global dust storm. Geophysical Research Letters (Early access).

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The Nadir and Occultation for MArs Discovery (NOMAD) instrument on board ExoMars Trace Gas Orbiter (TGO) measured a large increase in water vapor at altitudes in the range of 40‐100 km during the 2018 global dust storm on Mars. Using a three‐dimensional general circulation model, we examine the mechanism responsible for the enhancement of water vapor in the upper atmosphere. Experiments with different prescribed vertical profiles of dust show that when more dust is present higher in the atmosphere the temperature increases and the amount of water ascending over the tropics is not limited by saturation until reaching heights of 70‐100 km. The warmer temperatures allow more water to ascend to the mesosphere. Photochemical simulations show a strong increase in high‐altitude atomic hydrogen following the high‐altitude water vapor increase by a few days.

Item Type: Journal Item
Copyright Holders: 2019 American Geophysical Union
ISSN: 1944-8007
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetUK Space Agency (UKSA)
Keywords: Mars; Dust Storm; Mars Year 34; GCM modelling; Hydrogen escape
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 66626
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 16 Sep 2019 14:38
Last Modified: 20 Nov 2019 07:36
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