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Does anyone know what Danish Space centre DNSC08 mean sea surface model uses as the reference ellipsoid? there is no meta data on the web site:

http://www.space.dtu.dk/English/Research/Scientific_data_and_models/Global_Mean_sea_surface.aspx

There are several publications.
50% state TOPEX (the data comes from the IceSat missions) 50% state WGS84.

The difference between TOPEX and WGS is ~0.7m which is very significant.

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TOPEX - information given to me by someone at the Danish Space Center

edit

As well as the above pers comm, several papers such as this recent dissertation tell us that the ellipsoid is TOPEX

A new approach to the determination of a mean sea surface model using multi-satellite altimeter data ~ a dissertation by Kim, Hyo-Jin 2015

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