Preprints
https://doi.org/10.5194/tc-2021-80
https://doi.org/10.5194/tc-2021-80

  08 Apr 2021

08 Apr 2021

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

The MOSAiC Drift: Ice conditions from space and comparison with previous years

Thomas Krumpen1,, Luisa von Albedyll1,, Helge F. Goessling1,, Stefan Hendricks1,, Bennet Juhls1,, Gunnar Spreen2,, Sascha Willmes3,, H. Jakob Belter1, Klaus Dethloff1, Christian Haas1, Lars Kaleschke1, Christian Katlein1, Xiangshan Tian-Kunze1, Robert Ricker1, Philip Rostosky2, Janna Rueckert2, Suman Singha4, and Julia Sokolova5 Thomas Krumpen et al.
  • 1Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
  • 2University of Bremen, Institute of Environmental Physics, Otto-Hahn Allee 1, 28359 Bremen, Germany
  • 3University of Trier, Environmental Meteorology, Universitätsring 15, 54296 Trier, Germany
  • 4German Aerospace Center, Remote Sensing Technology Institute, SAR Signal Processing, Am Fallturm 9, 28359 Bremen, Germany
  • 5Arctic and Antarctic Research Institute, Ulitsa Beringa, 38, Saint Petersburg, 199397, Russia
  • These authors contributed equally to this work.

Abstract. We combine satellite data products to provide a first and general overview of the sea-ice conditions along the MOSAiC drift and a comparison with previous years. We find that the MOSAiC drift was around 25 % faster than the climatological mean drift, as a consequence of large-scale low-pressure anomalies prevailing around the Barents-Kara-Laptev Sea region between January and March. In winter (October–April), satellite observations show that the sea-ice in the vicinity of the Central Observatory (CO) was rather thin compared to the previous years along the same trajectory. Unlike ice thickness, satellite-derived sea-ice concentration, lead frequency, and snow thickness during winter month were close to the long-term mean with little variability. With the onset of spring and decreasing distance to Fram Strait, variability in ice concentration and lead activity increased. In addition, frequency and strength of deformation events (divergence and shear) were higher during summer than during winter. Overall, we find that sea-ice conditions observed close (~ 5 km) to the CO are representative for the wider (50 km and 100 km) surroundings. An exception is the ice thickness: Here we find that sea-ice near the CO (50 km radius) was 4 % thinner than sea-ice within a 100 km radius. Moreover, satellite acquisitions indicate that the formation of large melt ponds began earlier on the MOSAiC floe than on neighbouring floes.

Thomas Krumpen et al.

Status: open (until 03 Jun 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on tc-2021-80', Hans-Werner Jacobi, 13 Apr 2021 reply
    • CC2: 'Reply on CC1', Thomas Krumpen, 13 Apr 2021 reply

Thomas Krumpen et al.

Thomas Krumpen et al.

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Short summary
In this manuscript we make use of satellite data records collected along the MOSAiC drift to categorize the different ice conditions that shaped and characterized the floe and surroundings from the beginning until the end of the expedition. A comparison with previous years is made whenever possible. The aim of this analysis is to provide a basis and reference for subsequent research in the six main research areas of MOSAiC: atmosphere, ocean, sea ice, biogeochemistry, remote sensing and ecology.