Removing low-frequency artefacts from Datawell DWR-G4 wave buoy measurements

Removing low-frequency artefacts from Datawell DWR-G4 wave buoy measurements

In this study we describe a previously unreported error in the vertical-displacement time series made with GPS-based Datawell DWR-G4 wave buoys and introduce a simple method to correct the resulting wave spectra. The artefact in the time series is found to resemble a sawtooth wave, which produces an...

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Main Authors: J.-V. Björkqvist, H. Pettersson, L. Laakso, K. K. Kahma, H. Jokinen, P. Kosloff
Format: Article
Language:English
Published: Copernicus Publications 2016-02-01
Series:Geoscientific Instrumentation, Methods and Data Systems
Online Access:http://www.geosci-instrum-method-data-syst.net/5/17/2016/gi-5-17-2016.pdf
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spelling doaj-47bf1f1569ec49d7b0a5934d1f09713c2020-11-24T21:43:42ZengCopernicus PublicationsGeoscientific Instrumentation, Methods and Data Systems2193-08562193-08642016-02-0151172510.5194/gi-5-17-2016Removing low-frequency artefacts from Datawell DWR-G4 wave buoy measurementsJ.-V. Björkqvist0H. Pettersson1L. Laakso2K. K. Kahma3H. Jokinen4P. Kosloff5Finnish Meteorological Institute, Helsinki, FinlandFinnish Meteorological Institute, Helsinki, FinlandFinnish Meteorological Institute, Helsinki, FinlandFinnish Meteorological Institute, Helsinki, FinlandFinnish Meteorological Institute, Helsinki, FinlandFinnish Meteorological Institute, Helsinki, FinlandIn this study we describe a previously unreported error in the vertical-displacement time series made with GPS-based Datawell DWR-G4 wave buoys and introduce a simple method to correct the resulting wave spectra. The artefact in the time series is found to resemble a sawtooth wave, which produces an erroneous trend following an <i>f</i><sup>&minus;2</sup> power law in frequency space. The correction method quantifies the amount of erroneous trend below a certain maximum frequency and removes the spurious energy from all frequencies assuming the above-mentioned <i>f</i><sup>&minus;2</sup> power law. The presented correction method is validated against an experimental field test, and its impact on the measured significant wave height is quantified. The method's sensitivity to the choice of the maximum frequency is also briefly discussed.http://www.geosci-instrum-method-data-syst.net/5/17/2016/gi-5-17-2016.pdf
collection DOAJ
language English
format Article
sources DOAJ
author J.-V. Björkqvist
H. Pettersson
L. Laakso
K. K. Kahma
H. Jokinen
P. Kosloff
spellingShingle J.-V. Björkqvist
H. Pettersson
L. Laakso
K. K. Kahma
H. Jokinen
P. Kosloff
Removing low-frequency artefacts from Datawell DWR-G4 wave buoy measurements
Geoscientific Instrumentation, Methods and Data Systems
author_facet J.-V. Björkqvist
H. Pettersson
L. Laakso
K. K. Kahma
H. Jokinen
P. Kosloff
author_sort J.-V. Björkqvist
title Removing low-frequency artefacts from Datawell DWR-G4 wave buoy measurements
title_short Removing low-frequency artefacts from Datawell DWR-G4 wave buoy measurements
title_full Removing low-frequency artefacts from Datawell DWR-G4 wave buoy measurements
title_fullStr Removing low-frequency artefacts from Datawell DWR-G4 wave buoy measurements
title_full_unstemmed Removing low-frequency artefacts from Datawell DWR-G4 wave buoy measurements
title_sort removing low-frequency artefacts from datawell dwr-g4 wave buoy measurements
publisher Copernicus Publications
series Geoscientific Instrumentation, Methods and Data Systems
issn 2193-0856
2193-0864
publishDate 2016-02-01
description In this study we describe a previously unreported error in the vertical-displacement time series made with GPS-based Datawell DWR-G4 wave buoys and introduce a simple method to correct the resulting wave spectra. The artefact in the time series is found to resemble a sawtooth wave, which produces an erroneous trend following an <i>f</i><sup>&minus;2</sup> power law in frequency space. The correction method quantifies the amount of erroneous trend below a certain maximum frequency and removes the spurious energy from all frequencies assuming the above-mentioned <i>f</i><sup>&minus;2</sup> power law. The presented correction method is validated against an experimental field test, and its impact on the measured significant wave height is quantified. The method's sensitivity to the choice of the maximum frequency is also briefly discussed.
url http://www.geosci-instrum-method-data-syst.net/5/17/2016/gi-5-17-2016.pdf
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AT kkkahma removinglowfrequencyartefactsfromdatawelldwrg4wavebuoymeasurements
AT hjokinen removinglowfrequencyartefactsfromdatawelldwrg4wavebuoymeasurements
AT pkosloff removinglowfrequencyartefactsfromdatawelldwrg4wavebuoymeasurements
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