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Published in:
2010 | OriginalPaper | Chapter
A 15-Year Reconstruction of Sea Level Anomalies Using Radar Altimetry and GPS-Corrected Tide Gauge Data
Authors : Nana Schön, Saskia Esselborn, Tilo Schöne
Published in: System Earth via Geodetic-Geophysical Space Techniques
Publisher: Springer Berlin Heidelberg
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Abstract
A reconstruction of sea level anomalies (SLA) using tide gauges and satellite radar altimetry data for the 1987–2001 period is presented. The time series of a set of 18 tide gauges from the TIGA network, for which GPS vertical trends were available, are corrected for land movement. The comparison with a reconstruction using glacial isostatic adjustment (GIA) model data, as well as with altimetry data, yields a better regional resolution of SLAs in the North Atlantic and North Pacific. The lack of eligible tide gauges makes for a slightly noisy yet stable reconstruction. A comparably low rate of sea level rise of 0.4 mm/year (compared to 3.6 mm/year from uncorrected tide gauge data), is calculated for the 1987–2001 period. In contrast, for the 1995–2001 period, comparison with the trend from altimetry data yields good agreement at 2.2 mm/year vs. 2.4 mm/year (tide gauges: 3.1 mm/year).