Accuracy of Global Comparisons Between Altimetry and Tide Gauges
Event: 2015 Ocean Surface Topography Science Team Meeting
Session: Science I: Mean sea level monitoring: how to reconcile altimetry, tide gauges, land motion and other in situ observations?
Presentation type: Type Oral
Contribution: PDF file
The latter class of methods is based on existing tide gauges networks (GLOSS/CLIVAR, PSMSL, REFMAR), quality controlled and corrected to provide a physical measurement comparable with altimetry measurements. Results are highly dependent on processing choices like station selection, altimetry collocation, geophysical corrections for both in-situ and altimetry data. In the present study, we look for the source of observed discrepancies between tide gauges and satellite altimetry: do they reflect errors in satellite altimetry or tide gauges networks.
Results from comparisons between TOPEX/Poseidon, Jason-1 and Jason-2, which define the climate sea level record, and in-situ stations are considered here. We try to separate true altimetry problems from artifacts linked to in-situ events. This represents a new step in establishing the accuracy of our methodology for performing global comparisons between altimetry and in-situ.