Preprints
https://doi.org/10.5194/tc-2021-126
https://doi.org/10.5194/tc-2021-126

  26 Apr 2021

26 Apr 2021

Review status: this preprint is currently under review for the journal TC.

Snowfall and snow accumulation processes during the MOSAiC winter and spring season

David N. Wagner1,2, Matthew D. Shupe3,4, Ola G. Persson3,4, Taneil Uttal3, Markus M. Frey5, Amélie Kirchgaessner5, Martin Schneebeli1, Matthias Jaggi1, Amy R. Macfarlane1, Polona Itkin6,7, Stefanie Arndt8, Stefan Hendricks8, Daniela Krampe8, Robert Ricker8, Julia Regnery8, Nikolai Kolabutin9, Egor Shimanshuck9, Marc Oggier10, Ian Raphael11, and Michael Lehning1,2 David N. Wagner et al.
  • 1WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland
  • 2CRYOS, School of Architecture, Civil and Environmental Engineering, EPFL, Lausanne, Switzerland
  • 3NOAA Physical Science Laboratory, Boulder, CO, USA
  • 4Cooperative Institute for the Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, USA
  • 5British Antarctic Survey - Natural Environment Research Council, Cambridge, UK
  • 6University of Tromsø, Tromsø, Norway
  • 7Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO, USA
  • 8Alfred-Wegener Institute, Bremerhaven, Germany
  • 9Arctic and Antarctic Research Institute, St. Petersburg, Russia
  • 10University of Alaska Fairbanks, Fairbanks, AK, USA
  • 11Thayer School of Engineering, Dartmouth College, Hanover, NH, USA

Abstract. Data from the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition allowed us to investigate the temporal dynamics of snowfall, snow accumulation, and erosion in great detail for almost the whole accumulation season (November 2019 to May 2020). We computed cumulative snow water equivalent (SWE) over the sea ice based on snow depth (HS) and density retrievals from a SnowMicroPen (SMP) and approximately weekly-measured snow depths along fixed transect paths. Hence, the computed SWE considers surface heterogeneities over an average path length of 1469 m. We used the SWE from the snow cover to compare with precipitation sensors installed during MOSAiC. The data were compared with ERA5 reanalysis snowfall rates for the drift track. Our study shows that the simple fitted HS-SWE function can well be used to compute SWE along a transect path based on SMP SWE retrievals and snow-depth measurements. We found an accumulated snow mass of 34 mm SWE until 26 April 2020. Further, we found that the Vaisala Present Weather Detector 22 (PWD22), installed on a railing on the top deck of research vessel Polarstern was least affected by blowing snow and showed good agreements with SWE retrievals along the transect, however, it also systematically underestimated snowfall. The OTT Pluvio2 and the OTT Parsivel2 were largely affected by wind and blowing snow, leading to higher measured precipitation rates, but when eliminating drifting snow periods, especially the OTT Pluvio2 shows good agreements with ground measurements. A comparison with ERA5 snowfall data reveals a good timing of the snowfall events and good agreement with ground measurements but also a tendency towards overestimation. Retrieved snowfall from the ship-based Ka-band ARM Zenith Radar (KAZR) shows good agreements with SWE of the snow cover and comparable differences as ERA5. Assuming the KAZR derived snowfall as an upper limit and PWD22 as a lower limit of a cumulative snowfall range, we estimate 72 to 107 mm measured between 31 October 2019 and 26 April 2020. For the same period, we estimate the precipitation mass loss along the transect due to erosion and sublimation as between 53 and 68 %. Until 7 May 2020, we suggest a cumulative snowfall of 98–114 mm.

David N. Wagner et al.

Status: open (until 21 Jun 2021)

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David N. Wagner et al.

David N. Wagner et al.

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Short summary
Based on measurements of the snow cover over sea ice and atmospheric measurements, we estimate snowfall and snow accumulation for the MOSAiC ice floe, between November 2019 and May 2020. For this period, we estimate 98–114 mm of precipitation. We suggest that about 34 mm of snow-water equivalent has accumulated until the end of April 2020 and that at least 50 % of the precipitated snow has been eroded or sublimated. Further, we suggest explanations for potential snowfall overestimation.