Improving the Coastal Mean Dynamic Topography by Geodetic Combination of Tide Gauge and Satellite Altimetry

Ole Baltazar Andersen*, Karina Nielsen, Per Knudsen, Chris W. Hughes, Rory Bingham, Luciana Fenoglio-Marc, Médéric Gravelle, Michael Kern, Sara Padilla Polo

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalMarine Geodesy
Volume41
Issue number6
Pages (from-to)517-545
ISSN0149-0419
DOIs
Publication statusPublished - 2018

Keywords

  • Mean dynamic topography
  • Satellite altimetry
  • Tide gauge

Cite this

Andersen, Ole Baltazar ; Nielsen, Karina ; Knudsen, Per ; Hughes, Chris W. ; Bingham, Rory ; Fenoglio-Marc, Luciana ; Gravelle, Médéric ; Kern, Michael ; Polo, Sara Padilla. / Improving the Coastal Mean Dynamic Topography by Geodetic Combination of Tide Gauge and Satellite Altimetry. In: Marine Geodesy. 2018 ; Vol. 41, No. 6. pp. 517-545.
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title = "Improving the Coastal Mean Dynamic Topography by Geodetic Combination of Tide Gauge and Satellite Altimetry",
abstract = "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.",
keywords = "Mean dynamic topography, Satellite altimetry, Tide gauge",
author = "Andersen, {Ole Baltazar} and Karina Nielsen and Per Knudsen and Hughes, {Chris W.} and Rory Bingham and Luciana Fenoglio-Marc and M{\'e}d{\'e}ric Gravelle and Michael Kern and Polo, {Sara Padilla}",
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Improving the Coastal Mean Dynamic Topography by Geodetic Combination of Tide Gauge and Satellite Altimetry. / Andersen, Ole Baltazar; Nielsen, Karina; Knudsen, Per; Hughes, Chris W.; Bingham, Rory; Fenoglio-Marc, Luciana; Gravelle, Médéric; Kern, Michael; Polo, Sara Padilla.

In: Marine Geodesy, Vol. 41, No. 6, 2018, p. 517-545.

Research output: Contribution to journalJournal articleResearchpeer-review

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, Chris W.

AU - Bingham, Rory

AU - Fenoglio-Marc, Luciana

AU - Gravelle, Médéric

AU - Kern, Michael

AU - Polo, Sara Padilla

PY - 2018

Y1 - 2018

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

U2 - 10.1080/01490419.2018.1530320

DO - 10.1080/01490419.2018.1530320

M3 - Journal article

VL - 41

SP - 517

EP - 545

JO - Marine Geodesy

JF - Marine Geodesy

SN - 0149-0419

IS - 6

ER -