Reducing bias due to noise and attenuation in open-ocean echo integration data
MetadataShow full item record
© 2015 International Council for the Exploration of the Sea All rights reserved.Measurements of mean volume backscattering strength (Sv, dB re 1 m21) at ocean-basin scale were made using 38-kHz hull-mounted echosounders on ships of opportunity as part of Australia's Integrated Marine Observing System. The datawere collected on vessels of various designs, none of which were purposely built for collecting high-quality acoustic data. A full range of weather extremes affected the quality of the data and could cause large biases in Sv. To remove first-order biases and improve processing efficiency, a sequence of new and existing data processing filters were applied in a semi-Automated procedure. These filters were designed to mitigate the effects of three types of noise: impulsive (less than one ping), transient (multiple pings), and background (hours or longer).Afilterwas also applied to identify signals thatwere attenuated by air bubbles beneath the transducer. These filters were applied to data from transits across the Southwest Pacific, Indian, and Southern Oceans to produce qualitycontrolled Sv datasets that are now available from a publicly accessible repository. These filters may be relevant to other open-ocean acoustic observing endeavours, and one or more could be used to mitigate bias in data from a range of acoustic applications.
Showing items related by title, author, creator and subject.
Oceanic, latitudinal, and sex-specific variation in demography of a tropical deepwater snapper across the indo-pacific regionWilliams, A.; Wakefield, Corey; Newman, Stephen; Vourey, E.; Abascal, F.; Halafihi, T.; Kaltavara, J.; Nicol, S. (2017)Deepwater tropical fisheries provide an important source of income and protein to Pacific and Indian Ocean coastal communities who are highly dependent on fish for food security. The development of quantitative assessments ...
The challenges of modeling depth-integrated marine primary productivity over multiple decades: A case study at BATS and HOTSaba, V.; Friedrichs, M.; Carr, M.; Antoine, David; Armstrong, R.; Asanuma, I.; Aumont, O.; Bates, N.; Behrenfeld, M.; Bennington, V.; Bopp, L.; Bruggeman, J.; Buitenhuis, E.; Church, M.; Ciotti, A.; Doney, S.; Dowell, M.; Dunne, J.; Dutkiewicz, S.; Gregg, W.; Hoepffner, N.; Hyde, K.; Ishizaka, J.; Kameda, T.; Karl, D.; Lima, I.; Lomas, M.; Marra, J.; McKinley, G.; Mélin, F.; Moore, K.; Morel, A.; O’Reilly, J.; Salihoglu, B.; Scardi, M.; Smyth, T.; Tang, S.; Tjiputra, J.; Uitz, J.; Vichi, M.; Waters, K.; Westberry, T.; Yool, A. (2010)The performance of 36 models (22 ocean color models and 14 biogeochemical ocean circulation models (BOGCMs)) that estimate depth-integrated marine net primary productivity (NPP) was assessed by comparing their output to ...
Wang, K.; Khodabandeh, Amir; Teunissen, Peter; Nadarajah, Nandakumaran (2018)© 2018 American Society of Civil Engineers. The real-time kinematic precise point positioning (PPP-RTK) technique enables integer ambiguity resolution by providing singlereceiver users with information on the satellite ...