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  • 1.
    Xiao, Haifeng
    et al.
    Institute of Geodesy and Geoinformation Science, Technische Universität Berlin, Berlin, Germany.
    Stark, Alexander
    Institute of Planetary Research, German Aerospace Center (DLR), Berlin, Germany.
    Schmidt, Frédéric
    Université Paris-Saclay, CNRS, GEOPS, Orsay, France; Institut Universitaire de France (IUF), Paris, France.
    Hao, Jingyan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology. Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Kyoto, Japan.
    Steinbrügge, Gregor
    Department of Geophysics, Stanford University, Stanford, CA, USA.
    Wagner, Nicholas L.
    Department of Geosciences, Baylor University, Waco, TX, USA.
    Su, Shu
    Institute of Geodesy and Geoinformation Science, Technische Universität Berlin, Berlin, Germany.
    Cheng, Yuan
    College of Surveying and Geo-Informatics, Tongji University, Shanghai, China.
    Oberst, Jürgen
    Institute of Geodesy and Geoinformation Science, Technische Universität Berlin, Berlin, Germany.
    Spatio-Temporal Level Variations of the Martian Seasonal North Polar Cap From Co-Registration of MOLA Profiles2022In: Journal of Geophysical Research - Planets, ISSN 2169-9097, E-ISSN 2169-9100, Vol. 127, no 10, article id e2021JE007158Article in journal (Refereed)
    Abstract [en]

    The seasonal deposition and sublimation of CO2 constitute a major element in Martian volatile cycles. We reprocess the Mars Orbiter Laser Altimeter (MOLA) data and apply co-registration procedures to obtain spatio-temporal variations in levels of the Seasonal North Polar Cap (SNPC). The maximum level over the Residual North Polar Cap (RNPC) is 1.3 m, approximately half of that at the south pole (2.5 m). However, the maximum level in the dune fields at Olympia Undae can be up to 3.8 m. Furthermore, off-season decreases up to 3 m during the northern winter at Olympia Undae are observed. These are likely due to metamorphism effects accentuated by the reduced snowfall at this period. Meanwhile, off-season increases of up to 2 m during the northern spring are noted, the cause of which remains to be explored. The volume of the SNPC peaks at the end of northern winter and is estimated to be approximately 9.6 × 1012 m3, which is 2% more than that of the Seasonal South Polar Cap. The bulk density of the SNPC can go through phased decreases in accordance with phased accumulation at northern high-latitudes. These findings can put important constraints on the Martian volatile cycling models.

  • 2.
    Xiao, Haifeng
    et al.
    Institute of Geodesy and Geoinformation Science, Technische Universität Berlin, Berlin, Germany.
    Stark, Alexander
    Institute of Planetary Research German Aerospace Center (DLR), Berlin, Germany.
    Schmidt, Frédéric
    CNRS, GEOPS, Université Paris‐Saclay, Orsay, France; Institut Universitaire de France (IUF), Paris, France.
    Hao, Jingyan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
    Su, Shu
    Institute of Geodesy and Geoinformation Science, Technische Universität Berlin, Berlin, Germany.
    Steinbrügge, Gregor
    Department of Geophysics, Stanford University, Stanford, USA.
    Oberst, Jürgen
    Institute of Geodesy and Geoinformation Science Technische Universität Berlin, Berlin, Germany.
    Spatio‐temporal level variations of the Martian Seasonal South Polar Cap from co‐registration of MOLA profiles2022In: Journal of Geophysical Research - Planets, ISSN 2169-9097, E-ISSN 2169-9100, Vol. 127, no 7, article id e2022JE007196Article in journal (Refereed)
    Abstract [en]

    The seasonal deposition and sublimation of CO2 represents a major element in the Martian volatile cycle. Here, co-registration strategies are applied to Mars Orbiter Laser Altimeter (MOLA) profiles to obtain spatio-temporal variations in snow/ice level of the Seasonal South Polar Cap (SSPC), in grid elements of 0.5° in latitude from 60°S to 87°S and 10° in longitude. The maximum snow/ice level in the range of 2 m to 2.5 m is observed over the Residual South Polar Cap. Peak level at the Residual South Polar Cap in Martian Year 25 (MY25) are found to be typically ∼0.5 m higher than those in MY24. The total volume is estimated to peak at approximately 9.4× 1012 m3. In addition, a map of average bulk density of the SSPC during its recession is derived. It implies much more snowfall-like precipitation at the Residual South Polar Cap and its surroundings than elsewhere on Mars.

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