Explanation for the increase in high altitude water on Mars observed by NOMAD during the 2018 global dust storm
| Autor: | Stephen R. Lewis, Marco Giuranna, Bojan Ristic, James Holmes, Séverine Robert, Manish R. Patel, Matteo Crismani, Frank Daerden, Lori Neary, M. D. Smith, Justin Erwin, R. T. Clancy, Cédric Depiesse, Giuliano Liuzzi, Loïc Trompet, Ann Carine Vandaele, Shohei Aoki, M. J. Wolff, James A. Whiteway, Sébastien Viscardy, Arianna Piccialli, Ian Thomas, Yannick Willame, Geronimo Villanueva |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Water on Mars Mars Exploration Program Effects of high altitude on humans 010502 geochemistry & geophysics Atmospheric sciences 01 natural sciences Trace gas Atmosphere Geophysics Dust storm General Earth and Planetary Sciences Environmental science Water vapor Nadir (topography) 0105 earth and related environmental sciences |
| ISSN: | 1944-8007 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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