[en] DIVAnd (Data-Interpolating Variational Analysis, in n-dimensions) is a tool to interpolate observations on a regular grid using the variational inverse method. We have extended DIVAnd to include additional dynamic constraints relevant to surface currents, including imposing a zero normal velocity at the coastline, imposing a low horizontal divergence of the surface currents, temporal coherence and simplified dynamics based on the Coriolis force and the possibility of including a surface pressure gradient. The impact of these constraints is evaluated by cross-validation using the HF (High-Frequency) radar surface current observations in the Ibiza Channel from the Balearic Islands Coastal Ocean Observing and Forecasting System (SOCIB). A small fraction of the radial current observations are set aside to validate the velocity reconstruction. The remaining radial currents from the two radar sites are combined to derive total surface currents using DIVAnd and then compared to the cross-validation data set and to drifter observations. The benefit of the dynamic constraints is shown relative to a variational interpolation without these dynamical constraints. The best results were obtained using the Coriolis force and the surface pressure gradient as a constraint which are able to improve the reconstruction from the Open-boundary Modal Analysis, a quite commonly used method to interpolate HF radar observations, once multiple time instances are considered together.
Research Center/Unit :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Earth sciences & physical geography
Author, co-author :
Barth, Alexander ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER)
Troupin, Charles ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER)
Emma, Reyes
Alvera Azcarate, Aida ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER)
Beckers, Jean-Marie ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER)
Joaquı́n, Tintoré
Language :
English
Title :
Variational interpolation of high-frequency radar surface currents using DIVAnd
Publication date :
2021
Journal title :
Ocean Dynamics
ISSN :
1616-7341
eISSN :
1616-7228
Publisher :
Springer, Germany
Volume :
71
Pages :
293–308
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
H2020 - 730960 - SeaDataCloud - SeaDataCloud - Further developing the pan-European infrastructure for marine and ocean data management
Name of the research project :
SeaDataCloud project; JERICO-S3 project EMODnet - European Marine Observation and Data Network project
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique EU - European Union EC - European Commission
Funding text :
The F.R.S.-FNRS (Fonds de la Recherche Scientifique de Belgique) is acknowledged for funding the position of Alexander Barth. Computational resources have been provided in part by the Consortium des Equipements de Calcul Intensif (CECI), funded by the F.R.S.-FNRS under Grant No. 2.5020.11 and by the Walloon Region. Support from the SeaDataCloud project (grant agreement no. 730960) and the JERICO-S3 project (grant
agreement no. 871153) funded by European Union's Horizon 2020 and the EMODnet Physics project, funded by the European Commission Directorate General for Maritime Afairs and Fisheries are also gratefully acknowledged.
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