ESA Climate Change Initiative Sea Ice Round Robin Data Package (CCI SI RRDP phase 2)
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This data set was prepared as part of the ESA Climate Change Initiative for Sea Ice in phase 2 and includes non-satellite observations of sea ice freeboard and snow depths:
NASA Operation IceBridge, 2009-2015
AWI drifting snow depth buoys, 2013-2016
CRELL Ice Mass Balance Buoys, 2006-2015
North Pole drifting stations NP37-39, 2009-2012

Further information of the preparation of the 

The data set was prepared by Henriette Skourup, DTU Space, hsk@space.dtu.dk. 

When using the dataset, please, cite:  Kern, S., Khvorostovsky, K., Skourup, H., Rinne, E., Parsakhoo, Z. S., Djepa, V., Wadhams, P., and Sandven, S.: The impact of snow depth, snow density and ice density on sea ice thickness retrieval from satellite radar altimetry: results from the ESA-CCI Sea Ice ECV Project Round Robin Exercise, The Cryosphere, 9, 37–52, https://doi.org/10.5194/tc-9-37-2015, 2015.

An updated and extended data set including all data in the original version (except for the NP37-39) and many more covering the time period 1993–2024 with uncertainty estimates and quality flags is available at: 

Olsen, Ida Lundtorp; Skourup, Henriette (2026). Climate Change Initiative sea ice thickness Round Robin Data Package (CCI SIT RRDP). Technical University of Denmark. Dataset. https://doi.org/10.11583/DTU.24787341.