Lead: Axel Schweiger (axel[@]apl.uw.edu)

Current Sea Ice Reanalyses offer time and space complete representations of sea ice parameters for the satellite period (1979-present).  In order to obtain a better understanding of the both forced and internal drivers of sea ice variability, longer time series of sea ice variability, including extent, area, and thickness are desirable. Extended atmospheric and coupled reanalysis projects with temporal coverage from 1850 to the present offer the potential to generate sea ice reanalyses spanning 150 years or so. Other reconstruction methods have also been used to generate century scale sea ice reanalysis. Sea ice information from these project will be valuable in assessing internal and forced variability at longer time scales and put more recent observed variability in a longer term perspective.  

The specific goals of this SIMIP project are:
– Collect and jointly analyze sea ice information from various sea ice reanalysis projects with analysis periods starting before the satellite period.  (e.g 1948- present, 1900-present)
– Share information about existing data sets useful for the reanalysis (assimilation) or for validation. Identify additional needs and opportunities for data recovery, cross-validation, and inter-calibration.

– Completed 1901-2010 reconstruction of sea ice thickness, motion, etc.
– Paper: Schweiger, A.J., K.R. Wood, and J. Zhang, 2019: Arctic Sea Ice Volume Variability over 1901–2010: A Model-Based Reconstruction. J. Climate, 32, 4731–4752, https://doi.org/10.1175/JCLI-D-19-0008.1
– Data: http://psc.apl.uw.edu/research/projects/piomas-20c/
Other relevant activities:
– PSC Unified Ice Thickness Data base: http://psc.apl.uw.edu/sea_ice_cdr/
– Contains sea ice thickness information 1948-2018, updated a few times a year (copy at NSIDC,
– Please send any information not there yet! There is stuff I don’t have… e.g. Fram Strait Moorings
– Ben Holt’s “On-Ice Arctic Sea Ice Thickness Measurements by Auger, Core, and Electromagnetic Induction 1894-2011.