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Unabated global mean sea-level rise over the satellite altimeter era -…
Unabated global mean sea-level rise over the
satellite altimeter era
Sources of Error
Systematic
Bias Drift
Non-zero instrumental drifts that are satelite specific
change of ~3.2 mm/yr to 2.6 mm/yr (between 1993 and 2014)
Vertical Land Movement (VLM)
Isostaic changes that affect sea-level
Glacial Isostatic Adjustment
Movement of land that is no longer being 'burdened' by glaciers
Figure 1
Map of the initial 122 Tidal Gauges used in GMSL analysis
Unlike now, this data was seminal (weekly)
Since this figure, the network of TGs used have been expanded to 96 more
Data is now hourly
Figure 2
Individual mission bias drift estimates & GMSL trends (w/r to applied VLM)
with applied VLM, bias drift estimates are more positive
These estimates include corrections for ocean expansion due to GIA & impact of atmospheric pressure.
Estimates are highly consistent with multiple sources from different time periods
However, the cause of this bias drift (in the early TOPEX records) are still largely unspecified.
Figure 3
Adjusted & unadjusted satellite altimeter GMSL time series
The corrections for bias drift & GPS VLM are added in the "adjustments"
From 2008 onwards, the data largely is overestimated by the trend
^More data points lie below the linear trendline