Radar-Derived Compositional Diversity of the Youngest Martian Volcanics: An Exploratory Study

This Zenodo record provides supplementary data supporting the study “Radar-Derived Compositional Diversity of the Youngest Martian Volcanics: An Exploratory Study. (DOI: 10.3847/PSJ/ae5822)”. The dataset consists of two comma-separated value (CSV) files containing all parameters required to reproduce the radar-based subsurface mapping that serves as input to the attenuation (loss tangent) analysis presented in the paper. Loss estimates were derived from subsurface reflectors mapped in radargrams produced by the U.S. SHARAD team and archived in the NASA Planetary Data System (PDS): https://pds-geosciences.wustl.edu/mro/mro-m-sharad-5-radargram-v2/mrosh_2101/data/rgram/. Reflectors were identified in SHARAD radargrams and used to estimate dielectric loss properties of volcanic and glacial deposits on Mars. Data Files The dataset includes the following files: Morgan_Campbell_SHARAD_Analysis_Volcanics.csvReflectors mapped across nine volcanic sites. Morgan_Campbell_SHARAD_Analysis_Glacial.csvReflectors mapped within glacial deposits. Each CSV file contains, for every mapped reflector frame: “Site”: Site name/type “Orbit”: SHARAD orbit number “Reflector X”: Radargram X-pixel index (along-track position) corresponding to the subsurface reflector “Surface Y”: Radargram Y-pixel index corresponding to the surface echo at the same X-pixel location “Reflector Y”: Radargram Y-pixel index corresponding to the subsurface reflector All frames that comprise each mapped reflector are included in the files. Data Filtering and Usage Notes During loss tangent estimation, individual frames were filtered based on signal quality. Frames with a signal-to-noise ratio (SNR), after noise subtraction, of less than 5 dB were excluded from the final loss calculations. Consequently, the number of frames contributing to the reported loss estimates (see Table 1 of the associated publication) is smaller than the total number of frames listed in the CSV files. Geographic Referencing Geographic coordinates (latitude and longitude) for each reflector frame can be derived by combining the reported SHARAD orbit numbers and radargram pixel indices with the corresponding SHARAD geometry (“Geom”) files archived on the PDS: https://pds-geosciences.wustl.edu/mro/mro-m-sharad-5-radargram-v2/mrosh_2101/data/geom/. This enables precise spatial registration of the subsurface reflectors used in the analysis. Corresponding Publication Radar-Derived Compositional Diversity of the Youngest Martian Volcanics: An Exploratory Study. Gareth A. Morgan & Bruce A. Campbell. Planetary Science Journal