Update fo the 2D Sea Level Reconstructions from Meyssignac et al 2012

The major improvement in this version of the reconsturuction compared to Meyssignac et al. 2012 is that we use regional EOFs instead of global EOFs. For more details see Carson et al. 2017

The reconstruction provided here as "alti", "gecco2" "oras4" "soda216" is based on EOFS from respectively satellite altimetry, and ocean reanalyses GECCO2, ORAS4, and SODA2.16 . The "mean" reconstruction is the ensemble mean of the 4 previous reconstructions as described in Meyssignac et al 2012.

For all reconstructions:
Resolution: Horizontal: 1degx1deg
	    Temporal: Annual averages

Contact: benoit.meyssignac at legos.obs-mip.fr

References:

Meyssignac B., Becker M., Llovel W. and Cazenave A., 2012a. An assessment of
two-dimensional past sea level reconstructions over 1950-2009 based on tide gauge data
and different input sea level grids. Survey in Geophysics, online. doi :10.1007/s10712-011-
9171-x.

Carson M., A. Köhl,  D. Stammer, B. Meyssignac, J. Church, J. Schröter, M. Wenzel, and B. Hamlington Regional sea level variability and trends, 1960-2007 - A comparison of sea level reconstructions and ocean syntheses, Journal of Geophysical Research - Oceans, under revision at this time (june 2017)