C.king April 27, 2016
NSIDC ice-cover fraction for ECCO v4 (LLC90) assimilation

 Ice-cover fraction from http://nsidc.org/nsidc-0079

Comiso, J. C. 2000, updated 2015. 
Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, 
Boulder, Colorado USA. 
NASA National Snow and Ice Data Center Distributed Active Archive Center. 

The monthly ice-cover fraction data has been mapped onto the the ECCO v4 
model grid, using gcmfaces (see Forget et al 2015), and organized by year.
Missing values are masked with -9999.

The names of these datasets are: 
nsidc79_monthly_YYYY    where YYYY=1992:2014

References:
 Forget, G., J.-M. Campin, P. Heimbach, C. N. Hill, R. M. Ponte, and C. Wunsch, 2015:
  ECCO version 4: an integrated framework for non-linear inverse modeling and global ocean
  state estimation. Geoscientific Model Development, 8, 3071-3104, doi:10.5194/gmd-8-3071-2015

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