MOOSE HF radar daily averaged surface currents from MEDTLN site (Toulon NW Med)
|Temporal extent||2012-05-01 -2014-09-30|
|Author(s)||Zakardjian Bruno1, Quentin Céline1|
|Affiliation(s)||1 : Mediterranean Institute of Oceanography - UMR7294/UM110 AMU/UTLN/CNRS/IRD, France|
In the framework of the SNO/SOERE MOOSE (Mediterranean Ocean Observing System on Environment) program, the Mediterranean Institute of Oceanography is operating coastal High Frequency Surface Wave Radars (HF radar) on the North Western Mediterranean coast. HF radar provide high resolution (3-5 km), synoptic view of surface currents from the shore up to 80 km off shore at hourly time scales. The measurement principle is based on the Doppler effect created by an additional current on the intrinsic speed of the waves selected by radar-sea interactions, called Bragg waves, having a wavelength of half that of the radar e.m. waves and propagating in the axis of observation (radial currents). A single radar scans the sea in azimuth and determines the radial components of the current at each adjacent cell along each azimuth. Two separate radars for the same area from different angles then collect the information necessary for mapping vector current from the combination of the two sets of radial components.
The MOOSE HF radar MEDTLN data set is made of daily averaged surface currents, geo-referenced on Cartesian lon/lat coordinates. Those are computed from hourly total velocity data of level L3B (velocity threshold and GDOP threshold tests passed) for which additional RFI outliers’ eliminations are made using a one inertial period (17h at 43°N) statistical method based on the number of L3B valid data, variance and mean over the 17h period by reference to the long term (full dataset) statistics. The associated quality control (QC) indexes for the hourly data range from 0 (missing or bad values) to 4 (best confidence values). Details of the method available on the MOOSE HFradar website. Velocities, variances and QC values in this file are those averaged on a lunar daily basis (25 hours average) centered at noon of each day. Hourly data for specific studies may be available on equest (see contacts below).
|Utilisation||Data are published without any warranty, express or implied. The user assumes all risk arising from his/her use of data. Data are intended to be research-quality and include estimates of data quality and accuracy, but it is possible that these estimates or the data themselves contain errors. It is the sole responsibility of the user to assess if the data are appropriate for his/her use, and to interpret the data, data quality, and data accuracy accordingly. Authors welcome users to ask questions and report problems.|
|Acknowledgements||The MOOSE HFradar network was set up and is currently maintained with support from CNRS/INSU, Toulon University, ALLENVI, the EU MED Program TOSCA and H2020-INFRAIA JERICO-next project, the PACA Regional Council and Var Department. Thanks also to the radar site hosting partners: Port-Cros National Park, Conservatoire du littoral, CEREMA and Association Syndicale Autorisée du Cap Bénat.|
WERA (Wellen Radar - Helzel Messtechnik GmbH) operated at 16.1-16.2 MHz - 50 kHz bandwidth (3km range resolution) - 8 receiving antennas and MUSIC Direction Finding (2° azimuthal resolution) in monostatic (Peyras site) and bistatic (Benat-Porquerolles site) configuration. Vector component gridded on a 2km X 2km Cartesian regular grid. More details of the intallation and acquisition protocols can be found on the real-time dedicated web site http://hfradar.univ-tln.fr/ and in Quentin et al. 2014.7th EuroGOOS Conference Proceedings, Oct 2014, Lisboa, Portugal Buch E, Antoniou Y, Eparkhina D, Nolan G (Eds.) ISBN 978-2-9601883-1-8, pp 111-118.