Coastal applications from nadir altimetry: Example of the X-TRACK regional products

In the coastal ocean zones, satellite altimetry data processing and interpretation poses specific difficulties, due to the interaction of the radar signal with land topography, inaccuracies in some of the geophysical corrections and to the fast changes in the sea level. In order to optimize the comp...

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Publicado:	2017
Materias:	Coastal observations CTOH Database Ocean dynamics Radar altimetry Sea surface height Aneroid altimeters Coastal zones Data handling Database systems Gages Glacial geology Marine applications Oceanography Radar Satellites Space-based radar Surface waters Tide gages Time series Sea level
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v59_n4_p936_Birol http://hdl.handle.net/20.500.12110/paper_02731177_v59_n4_p936_Birol
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_02731177_v59_n4_p936_Birol
record_format	dspace
spelling	paper:paper_02731177_v59_n4_p936_Birol2023-06-08T15:25:45Z Coastal applications from nadir altimetry: Example of the X-TRACK regional products Coastal observations CTOH Database Ocean dynamics Radar altimetry Sea surface height Aneroid altimeters Coastal zones Data handling Database systems Gages Glacial geology Marine applications Oceanography Radar Satellites Space-based radar Surface waters Tide gages Time series Coastal observations CTOH Ocean dynamics Radar altimetry Sea surface height Sea level In the coastal ocean zones, satellite altimetry data processing and interpretation poses specific difficulties, due to the interaction of the radar signal with land topography, inaccuracies in some of the geophysical corrections and to the fast changes in the sea level. In order to optimize the completeness and the accuracy of the sea surface height information derived from satellite altimetry in coastal ocean areas, a dedicated post-processing software, called X-TRACK, has been developed by the Center of Topography of the Ocean and Hydrosphere in Toulouse. It is tailored for extending the use of altimetry data to coastal ocean applications and provides freely available along-track Sea Level Anomaly time series that cover today all the coastal oceans. Here, we present the improvements made in version 2016 of X-TRACK and show the gain in near-coastal data accuracy using in situ tide gauge observations. The correlations between altimeter and tide gauge sea level anomalies are higher (by 15% in average) compared with the previous version of X-TRACK. Three examples of applications are shown. The recent evolutions done in the X-TRACK processing result in an improved observation of the seasonal variations of the boundary circulation in the Bay of Biscay. Along Western Africa, sea-level variations derived from X-TRACK data are observed closer to land (5 km) compared to AVISO (10 km), and the sea-level statistics are more robust due to the larger and more stable data availability. Along-track empirical tidal constants derived from X-TRACK Sea Level Anomaly time series are also used to validate tidal models. By improving the altimetric data accuracy in coastal areas, we extend the field of marine applications. © 2016 COSPAR 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v59_n4_p936_Birol http://hdl.handle.net/20.500.12110/paper_02731177_v59_n4_p936_Birol
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Coastal observations CTOH Database Ocean dynamics Radar altimetry Sea surface height Aneroid altimeters Coastal zones Data handling Database systems Gages Glacial geology Marine applications Oceanography Radar Satellites Space-based radar Surface waters Tide gages Time series Coastal observations CTOH Ocean dynamics Radar altimetry Sea surface height Sea level
spellingShingle	Coastal observations CTOH Database Ocean dynamics Radar altimetry Sea surface height Aneroid altimeters Coastal zones Data handling Database systems Gages Glacial geology Marine applications Oceanography Radar Satellites Space-based radar Surface waters Tide gages Time series Coastal observations CTOH Ocean dynamics Radar altimetry Sea surface height Sea level Coastal applications from nadir altimetry: Example of the X-TRACK regional products
topic_facet	Coastal observations CTOH Database Ocean dynamics Radar altimetry Sea surface height Aneroid altimeters Coastal zones Data handling Database systems Gages Glacial geology Marine applications Oceanography Radar Satellites Space-based radar Surface waters Tide gages Time series Coastal observations CTOH Ocean dynamics Radar altimetry Sea surface height Sea level
description	In the coastal ocean zones, satellite altimetry data processing and interpretation poses specific difficulties, due to the interaction of the radar signal with land topography, inaccuracies in some of the geophysical corrections and to the fast changes in the sea level. In order to optimize the completeness and the accuracy of the sea surface height information derived from satellite altimetry in coastal ocean areas, a dedicated post-processing software, called X-TRACK, has been developed by the Center of Topography of the Ocean and Hydrosphere in Toulouse. It is tailored for extending the use of altimetry data to coastal ocean applications and provides freely available along-track Sea Level Anomaly time series that cover today all the coastal oceans. Here, we present the improvements made in version 2016 of X-TRACK and show the gain in near-coastal data accuracy using in situ tide gauge observations. The correlations between altimeter and tide gauge sea level anomalies are higher (by 15% in average) compared with the previous version of X-TRACK. Three examples of applications are shown. The recent evolutions done in the X-TRACK processing result in an improved observation of the seasonal variations of the boundary circulation in the Bay of Biscay. Along Western Africa, sea-level variations derived from X-TRACK data are observed closer to land (5 km) compared to AVISO (10 km), and the sea-level statistics are more robust due to the larger and more stable data availability. Along-track empirical tidal constants derived from X-TRACK Sea Level Anomaly time series are also used to validate tidal models. By improving the altimetric data accuracy in coastal areas, we extend the field of marine applications. © 2016 COSPAR
title	Coastal applications from nadir altimetry: Example of the X-TRACK regional products
title_short	Coastal applications from nadir altimetry: Example of the X-TRACK regional products
title_full	Coastal applications from nadir altimetry: Example of the X-TRACK regional products
title_fullStr	Coastal applications from nadir altimetry: Example of the X-TRACK regional products
title_full_unstemmed	Coastal applications from nadir altimetry: Example of the X-TRACK regional products
title_sort	coastal applications from nadir altimetry: example of the x-track regional products
publishDate	2017
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v59_n4_p936_Birol http://hdl.handle.net/20.500.12110/paper_02731177_v59_n4_p936_Birol
_version_	1768542125729775616

Coastal applications from nadir altimetry: Example of the X-TRACK regional products

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