TY - JOUR
T1 - Improving the Coastal Mean Dynamic Topography by Geodetic Combination of Tide Gauge and Satellite Altimetry
AU - Andersen, Ole Baltazar
AU - Nielsen, Karina
AU - Knudsen, Per
AU - Hughes, C. W.
AU - Bingham, Rory
AU - Fenoglio-Marc, Luciana
AU - Gravelle, Médéric
AU - Kern, Michael
AU - Polo, Sara Padilla
PY - 2018/12/1
Y1 - 2018/12/1
N2 - The ocean mean dynamic topography (MDT) is the surface representation of the ocean circulation. The MDT may be determined by the ocean approach, which involves temporal averaging of numerical ocean circulation model information, or by the geodetic approach, wherein the MDT is derived using the ellipsoidal height of the mean sea surface (MSS), or mean sea level (MSL) minus the geoid as the geoid. The ellipsoidal height of the MSS might be estimated either by satellite or coastal tide gauges by connecting the tide gauge datum to the Earth-centred reference frame. In this article we present a novel approach to improve the coastal MDT, where the solution is based on both satellite altimetry and tide gauge data using new set of 302 tide gauges with ellipsoidal heights through the SONEL network. The approach was evaluated for the Northeast Atlantic coast where a dense network of GNSS-surveyed tide gauges is available. The typical misfit between tide gauge and satellite or oceanographic MDT was found to be around 9 cm. This misfit was found to be mainly due to small scale geoid errors. Similarly, we found, that a single tide gauge places only weak constraints on the coastal dynamic topography.
AB - The ocean mean dynamic topography (MDT) is the surface representation of the ocean circulation. The MDT may be determined by the ocean approach, which involves temporal averaging of numerical ocean circulation model information, or by the geodetic approach, wherein the MDT is derived using the ellipsoidal height of the mean sea surface (MSS), or mean sea level (MSL) minus the geoid as the geoid. The ellipsoidal height of the MSS might be estimated either by satellite or coastal tide gauges by connecting the tide gauge datum to the Earth-centred reference frame. In this article we present a novel approach to improve the coastal MDT, where the solution is based on both satellite altimetry and tide gauge data using new set of 302 tide gauges with ellipsoidal heights through the SONEL network. The approach was evaluated for the Northeast Atlantic coast where a dense network of GNSS-surveyed tide gauges is available. The typical misfit between tide gauge and satellite or oceanographic MDT was found to be around 9 cm. This misfit was found to be mainly due to small scale geoid errors. Similarly, we found, that a single tide gauge places only weak constraints on the coastal dynamic topography.
KW - Mean dynamic topography
KW - satellite altimetry
KW - tide gauge
UR - http://www.scopus.com/inward/record.url?scp=85057315473&partnerID=8YFLogxK
U2 - 10.1080/01490419.2018.1530320
DO - 10.1080/01490419.2018.1530320
M3 - Article (Academic Journal)
AN - SCOPUS:85057315473
SN - 0149-0419
VL - 41
SP - 517
EP - 545
JO - Marine Geodesy
JF - Marine Geodesy
IS - 6
ER -