Data for "Spatiotemporal Heterogeneity in Greenland Firn from the Synthesis of Satellite Radar Altimetry and Passive Microwave Measurements"

<b>Version 1: original</b><br>These files contain the results presented in the manuscript "Spatiotemporal Heterogeneity in Greenland Firn from the Synthesis of Satellite Radar Altimetry and Passive Microwave Measurements" authored by Kirk M. Scanlan, Anja Rutishauser and Sebastian B. Simonsen (DOI: 10.1109/JSTARS.2026.3651847). The results are organised into 71 different files; one containing the results at locations of in situ measurements and 70 containing monthly pan-Greenland results. Note that monthly results correspond to the 10 non-melt seasons (i.e., October through April) as described in the related publication.The organisation of the data in the two types of files is slightly different. Units for the different data can be found in the netCDF metadata.<br><b>A) InSitu_Results.nc</b>1) In situ results are labelled using the measurement identification scheme used in the community database (DOI: 10.18739/A2M61BR5M).2) For each in situ location, the following relevant metadata are provided; latitude, longitude, month, year, ice sheet thickness (from BedMachine, DOI: 10.5067/GMEVBWFLWA7X), eps:3413 x coordinate, and eps:3413 y coordinate.3) L-band H- and V-polarization passive microwave brightness temperatures from SMOS (analysed as described in the manuscript) along with the accompanying radiometric accuracy and standard deviation can be found under the "smos" group.4) The relative dielectric permittivity of the Greenland Ice Sheet surface for each in situ location derived from ESA CryoSat-2 and ISRO/CNES SARAL can be found under the "rsr" group. The quality control metrics (i.e., correlation coefficient and search radius) are also provided for each in situ location.5) Forward-modeled SMOS H- and V-polarization passive microwave brightness temperatures as simulated using the Snow Microwave Radiative Transfer Model (SMRT) can be found under the "smrt" group6) The quantified misfit between the SMRT and SMOS H- and V-polarization brightness temperature spectra are reported under the "misfits" group.<br><b>B) _.nc</b>1) The 70 monthly results are each organised according to the 5243 nodes comprising the 20 km-by-20 km grid spanning the Greenland Ice Sheet.2) Metadata describing the location of each are provided under the latitude, longitude, x coordinate (epsg:3413), y coordinate (eps:3413) along with the surface elevation from ArcticDEM (DOI: 10.7910/DVN/OHHUKH), and ice sheet thickness from BedMachine (DOI: 10.5067/GMEVBWFLWA7X).3) L-band H- and V-polarization passive microwave brightness temperatures from SMOS (analysed as described in the manuscript) along with the accompanying radiometric accuracy and standard deviation can be found under the "smos" group.4) The relative dielectric permittivity of the Greenland Ice Sheet surface for each grid node derived from ESA CryoSat-2 and ISRO/CNES SARAL can be found under the "rsr" group.5) Forward-modeled SMOS H- and V-polarization passive microwave brightness temperatures as simulated using the Snow Microwave Radiative Transfer Model (SMRT) can be found under the "smrt" group6) The quantified misfit between the SMRT and SMOS H- and V-polarization brightness temperature spectra are reported under the "misfits" group.<br>This dataset contains the following files:<br><b>InSitu_Results.nc</b><b>_</b><b>.nc</b><br>Explanation of different variables:<br>Not all of these variables are found in all files, but this is a complete list of all variables contained within the different files.<br>Year: year of the in-situ measurementMonth: month of the in-situ measurementLatitude: latitude coordinate [deg]Longitude: ilongitude coordinate [deg]X: epsg:3413 X coordinate [m]Y: epsg:3413 Y coordinate [m]Z: ArcticDEM surface elevation [m]thickness: BedMachine ice sheet thickness [m]r: RSR search radius [m]crl: RSR statistical fit correlation coefficienteps: surface relative dielectric permittivity derived from the RSR results [-]BTh: observed or simulated passive microwave H-polarization brightness temperature [K]BTv: observed or simulated passive microwave V-polarization brightness temperature [K]BTh_radiometric_accuracy: radiometric accuracy of SMOS H-polarization brightness temperature [K]BTv_radiometric_accuracy: radiometric accuracy of SMOS V-polarization brightness temperature [K]BTh_standard_deviation: standard deviation of SMOS H-polarization brightness temperature [K]BTv_standard_deviation: standard deviation of SMOS V-polarization brightness temperature [K]theta: incidence angle at which brightness temperatures are observed/simulated [degrees]BTh: quantified misfit between modelled and observed H-polarization brightness temperature [-]BTv: quantified misfit between modelled and observed V-polarization brightness temperature [-]