EMIRS water ice cloud effective radius retrievals for one martian year

Published: 24 October 2023| Version 1 | DOI: 10.17632/6j57cjkd6t.1
Samuel Atwood


Approximately one Martian year (roughly solar longitude, L_s = 130 degrees from Mars Year 36 to 37; November 2021–September 2023) of thermal infrared spectra from the Emirates Mars Infrared Spectrometer (EMIRS) were utilized for this dataset. Retrieval output for each spectrum is stored as a self describing NetCDF4 file (https://www.unidata.ucar.edu/software/netcdf/). Variable descriptions are included in the file archive. Coordinate variables associated with the observation are latitude, longitude, solar longitude, local true solar time, emission angle of the observation, and the spacecraft clock timestamp when the observation was made. Output from the aerosol retrieval are stored as data variables and include the surface temperature, water-ice optical depth, water-ice optical depth uncertainty, water-ice effective radius, water-ice effective radius uncertainty, surface anisothermality "slope" correction parameter, surface emissivity correction parameter, estimated water condensation level, and a boolean flag indicating the effective radius retrieval passed quality checks and was considered valid. Each data point in this archive is associated with one unique EMIRS spectrum as indicated by the onboard spacecraft clock. Data points included here are those which passed quality checks for water-ice cloud optical depth. Data points which did not pass quality checks for the effective radius retrieval are indicated with the "refficevalid" flag. Description of the retrieval and data in this archive can be found in the manuscript "Spatial and temporal variability of martian water-ice cloud effective radius in EMIRS thermal infrared observations" by Samuel A. Atwood, Michael D. Smith, Michael J. Wolff, Khalid Badri, Christopher S. Edwards, Philip R. Christensen, Alain SJ. Khayat, and M. R. El-Maarry, submitted to Icarus.



University of Colorado Boulder Laboratory for Atmospheric and Space Physics


Radiative Transfer, Water, Atmospheric Ice, Planetary Atmosphere, Thermal Infrared Remote Sensing, Mars