Wyatt, L.R. orcid.org/0000-0002-9483-0018, Mantovanelli, A., Heron, M.L. et al. (2 more authors) (2018) Assessment of surface currents measured with high-frequency phased-array radars in two regions of complex circulation. IEEE Journal of Oceanic Engineering, 43 (2). pp. 484-505. ISSN 0364-9059
Abstract
Surface velocity data from two WERA high frequency (HF) ocean radar systems, deployed as part of the Australian Integrated Marine Observing System (IMOS), are compared with near surface currents obtained from drifters and ADCPs (acoustic Doppler current profiler). We evaluate data from two contrasting locations in the first detailed evaluation of the IMOS HF radar surface velocities. HF radar measurements are generally robust but demand quality-control procedures to eliminate obvious errors and outliers that appear temporarily or systematically in the data. A number of different quality control procedures and filters are applied and assessed including Taylor diagrams, Hampel and Savitzky-Golay filters. In addition the need for and effect of averaging are discussed. The radar measurements of surface current agreed better with the near-surface drifter currents than with the subsurface ADCP currents. Nonetheless the ADCP comparisons are consistent with those previously reported in other regions. The value of the Taylor Diagram for comparing different surface current data sets and processing approaches is demonstrated. Noise levels in the radar current spectra are used to estimate the error in the measurements and in some cases, these errors were found to approach the precision of the radar estimates. Our results give guidance on the most useful temporal sampling resolution. In particular we show that, at these sites and these operating frequencies, using 10-minute sampling without further averaging does not provide additional information because the higher frequencies are dominated by noise. Averaging the radials over 30-minutes may be sufficient for many applications.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 Institute of Electrical and Electronics Engineers (IEEE). Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | ADCP, coastal currents; Coffs Harbour; drifter; Eastern Australia; Great Barrier Reef; Hampel filter; HF radar; quality-control; Savitzky-Golay filter; Taylor Diagram; WERA |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 10 May 2017 14:48 |
Last Modified: | 18 Aug 2023 10:55 |
Status: | Published |
Publisher: | Institute of Electrical and Electronics Engineers |
Refereed: | Yes |
Identification Number: | 10.1109/JOE.2017.2704165 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:115935 |