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    Regional Atmospheric Dynamics of Water on Mars

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    Author
    Leung, Cecilia Wai See
    Issue Date
    2020
    Keywords
    Atmosphere
    Dynamics
    Mars
    Mesoscale
    Regional
    Water
    Advisor
    McEwen, Alfred S.
    Rafkin, Scot C.R.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Embargo
    Release after 03/15/2020
    Abstract
    The investigation of water on Mars continues to be a quintessential objective in planetary exploration since water represents a critical link to Mars’ past and present climate, geology, and its potential for habitability. Direct observations of water at the regional scale is limited, and the distribution and behavior of water in the planetary boundary layer remains an outstanding question. The research in this dissertation investigates the radiative and dynamical processes governing the regional water cycle on Mars. Using global and mesoscale atmospheric models, simulations of the regional water circulation revealed a highly non-homogeneous local distribution of water that is strongly modulated by diurnal transport. Terrain-following air parcels forced along the slopes of the Tharsis volcanoes and the steep canyon walls of Valles Marineris significantly impact the local water concentration and the associated conditions for cloud formation in these regions. An investigation of water ice fogs inside Valles Marineris showed significant variability between the local atmospheric environment inside versus outside the canyon. Formation of water ice clouds is possible in Valles Marineris, but their formation is highly influenced by radiative feedbacks forced by the thermal properties of the underlying surface. An evaluation of the potential influences of the atmosphere on recurring slope lineae (RSL) activity revealed an upper limit of ~1 µm per sol for the quantity of water that can be extracted from the atmosphere through deliquescence. Ongoing efforts to understand how regional atmospheric dynamics govern the distribution of water in the planetary boundary layer represent a significant step towards a comprehensive understanding of the water cycle on Mars.
    Type
    text
    Electronic Dissertation
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Graduate College
    Planetary Sciences
    Degree Grantor
    University of Arizona
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