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Discussion papers
https://doi.org/10.5194/tc-2019-307
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-2019-307
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 14 Jan 2020

Submitted as: research article | 14 Jan 2020

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal The Cryosphere (TC).

Satellite-based sea ice thickness changes in the Laptev Sea from 2002 to 2017: Comparison to mooring observations

Hans Jakob Belter1, Thomas Krumpen1, Stefan Hendricks1, Jens A. Hoelemann2, Markus A. Janout2, Robert Ricker1, and Christian Haas1 Hans Jakob Belter et al.
  • 1Sea Ice Physics, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
  • 2Physical Oceanography of the Polar Seas, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, AmHandelshafen 12, 27570 Bremerhaven, Germany

Abstract. The gridded sea ice thickness (SIT) climate data record (CDR) produced by the European Space Agency (ESA) Sea Ice Climate Change Initiative Phase 2 (CCI-2) is the longest available, Arctic-wide SIT record covering the period from 2002 to 2017. SIT data is based on radar altimetry measurements of sea ice freeboard from the Environmental Satellite (ENVISAT) and CryoSat-2 (CS2). The CCI-2 SIT has previously been validated with in situ observations from drilling, airborne electromagnetic (EM) measurements and Upward-Looking Sonars (ULS) from multiple ice-covered regions of the Arctic. Here we present the Laptev Sea CCI-2 SIT record from 2002 to 2017 and use newly acquired ULS and upward-looking Acoustic Doppler Current Profiler (ADCP) sea ice draft data (VAL) for validation of the gridded CCI-2 and additional satellite SIT products. The ULS and ADCP time series provide the first long-term satellite SIT validation data set from this important source region of sea ice in the Transpolar Drift. The comparison of VAL sea ice draft data with gridded monthly mean and orbit trajectory CCI-2 data, as well as merged CryoSat-2/SMOS (CS2SMOS) sea ice draft shows that the agreement between the satellite and VAL draft data strongly depends on the thickness of the sampled ice. Rather than providing mean sea ice draft the considered satellite products provide modal sea ice draft in the Laptev Sea. Ice thinner than the modal draft is overestimated, while thicker ice is increasingly underestimated by all satellite products investigated for this study. This tendency of the satellite SIT products to better agree with modal sea ice draft and underestimate thicker ice needs to be considered for all past and future investigations into SIT changes in this important region. The performance of the CCI-2 SIT CDR is considered stable over time, however, observed trends in gridded CCI-2 SIT are strongly influenced by the uncertainties of ENVISAT and CS2 and the comparably short investigation period.

Hans Jakob Belter et al.
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Hans Jakob Belter et al.
Data sets

Daily mean sea ice draft from moored Upward-Looking Sonars in the Laptev Sea between 2013 and 2015 H. J. Belter, M. A. Janout, T. Krumpen, E. Ross, J. A. Hoelemann, L. Timokhov, A. Novikhin, H. Kassens, G. Wyatt, S. Rousseau, and D. Sadowy https://doi.org/10.1594/PANGAEA.899275

ESA Sea Ice Climate Change Initiative (Sea_Ice_cci): Northern hemisphere sea ice thickness from the CryoSat-2 satellite on a monthly grid (L3C), v2.0. S. Hendricks, S. Paul, and E. Rinne https://doi.org/10.5285/ff79d140824f42dd92b204b4f1e9e7c2

ESA Sea Ice Climate Change Initiative (Sea_Ice_cci): Northern hemisphere sea ice thickness from the Envisat satellite on a monthly grid (L3C), v2.0. S. Hendricks, S. Paul, and E. Rinne https://doi.org/10.5285/f4c34f4f0f1d4d0da06d771f6972f180

ESA Sea Ice Climate Change Initiative (Sea_Ice_cci): Northern hemisphere sea ice thickness from CryoSat-2 on the satellite swath (L2P), v2.0. S. Hendricks, S. Paul, and E. Rinne https://doi.org/10.5285/5b6033bfb7f241e89132a83fdc3d5364

ESA Sea Ice Climate Change Initiative (Sea_Ice_cci): Northern hemisphere sea ice thickness from Envisat on the satellite swath (L2P), v2.0. S. Hendricks, S. Paul, and E. Rinne https://doi.org/10.5285/54e2ee0803764b4e84c906da3f16d81b

A weekly Arctic sea-ice thickness data record from merged CryoSat-2 and SMOS satellite data R. Ricker, S. Hendricks, L. Kaleschke, X. Tian-Kunze, J. King, and C. Haas https://doi.org/10.5194/tc-11-1607-2017

Hans Jakob Belter et al.
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Short summary
The validation of satellite sea ice thickness (SIT) climate data records with newly acquired moored sonar SIT data shows that satellite products provide modal rather than mean SIT in the Laptev Sea region. This tendency of satellite-based SIT products to underestimate mean SIT needs to be considered for investigations of sea ice volume transports. Validation of satellite SIT in the first year ice dominated Laptev Sea will support algorithm development for more reliable SIT records in the Arctic.
The validation of satellite sea ice thickness (SIT) climate data records with newly acquired...
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