Different approaches have been used to compute the mean rate of 20th century global mean sea level (GMSL) rise from
the available tide gauge data: computing average rates from only very long, nearly continuous records; using more numerous but shorter records and filters to separate nonlinear trends from decadal - scale quasi-periodic variability; neural network methods; computing regional sea level for specific basins then averaging; or projecting tide gauge records onto empirical orthogonal functions (EOFs) computed from modern altimetry or EOFs from ocean models.
Not exact matches
Error bars don't go away, they do shrink greatly once we have additional
data from
tide gauge sites and then from the global network of
tide gauge sites (the Hay et al curve)
available.
In a second step, we apply the method to reconstructing 2 - D sea level
data over 1950 — 2003, combining sparse
tide gauge records
available since 1950, with EOF spatial patterns from different sources: (1) thermosteric sea level grids over 1955 — 2003, (2) sea level grids from Topex / Poseidon satellite altimetry over 1993 — 2003, and (3) dynamic height grids from the SODA reanalysis over 1958 — 2001.
Bill Innis: Jevrejeva's most recent
tide gauge data from 2003 to 2009 shows sea level is actually falling The
data will likely become
available soon.