Preprints
https://doi.org/10.5194/egusphere-2022-501
https://doi.org/10.5194/egusphere-2022-501
 
27 Jun 2022
27 Jun 2022
Status: this preprint is open for discussion.

Impact of the sampling procedure on the specific surface area of snow measurements with the IceCube

Julia Martin1,2 and Martin Schneebeli2 Julia Martin and Martin Schneebeli
  • 1Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), Telegrafenberg, 14473 Potsdam, Germany
  • 2WSL Institute for Snow and Avalanche Research SLF, Flüelastrasse 11, 7260 Davos Dorf, Switzerland

Abstract. The specific surface area (SSA) of snow is directly measured by X-ray computed tomography or indirectly using the reflectance of near-infrared light. The IceCube is a well-established spectroscopic instrument using a near-infrared wavelength of 1310 nm. We compared the SSA of six snow types measured with both instruments. The IceCube measured significantly higher values with a relative percentage difference between 20 to 52 % for snow types with an SSA between 5 to 25 m2 kg−1. There is no significant difference for snow with an SSA between 30 to 80 m2 kg−1. The difference is statistically significant between snow types but not uniquely related to the SSA. We suspected that artificially created particles were the source of the difference. These were sampled, measured and counted. Numerical simulations with radiation transfer solver TARTES confirm the observation.

Julia Martin and Martin Schneebeli

Status: open (until 22 Aug 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-501', Anonymous Referee #1, 18 Jul 2022 reply
    • AC1: 'Reply on RC1', Julia Martin, 08 Aug 2022 reply
  • RC2: 'Comment on egusphere-2022-501', Anonymous Referee #2, 27 Jul 2022 reply
    • AC2: 'Reply on RC2', Julia Martin, 08 Aug 2022 reply
  • CC1: 'Comment on egusphere-2022-501', Florent Dominé, 10 Aug 2022 reply

Julia Martin and Martin Schneebeli

Data sets

IceCube_microCT_Snow_grainsize Martin, Julia; Schneebeli, Martin https://doi.org/10.16904/envidat.333

Model code and software

IceCube_microCT_Snow_grainsize Martin, Julia; Schneebeli, Martin https://doi.org/10.16904/envidat.333

Julia Martin and Martin Schneebeli

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Short summary
The grain size of snow determines how light is reflected and other physical properties. The IceCube measures snow grain size at the specific near-infrared wavelength of 1320 nm. In our study the preparation of snow samples for the IceCube creates a thin layer of small particles. Comparisons of the grain size with computed tomography, particle counting and numerical simulation confirm the observation. We conclude that snow grain size measurements at this wavelength underestimate the grain size.