and
CNES, n.d.;
National
Center for
Atmospheric Research Staff, 2016; Quante and
Colijn, 2016). Now,
additional
altimeters at different orbits perform slightly less
accurate measurements up to
82 N and S (Rhein
et
al., 2013). These records are used to estimate sea surface
changes and
calculate global mean sea
level, a temporal
average sea level
averaged over the oceans (
Church,
Clark, et
al., 2013
/media/vedurstofan-utgafa-2020/VI_2020_005.pdf