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dc.contributor.authorJones, Cathleen
dc.contributor.authorEspeseth, Martine Mostervik
dc.contributor.authorHolt, Benjamin
dc.contributor.authorBrekke, Camilla
dc.contributor.authorSkrunes, Stine
dc.date.accessioned2017-03-12T13:17:39Z
dc.date.available2017-03-12T13:17:39Z
dc.date.issued2016-10-18
dc.description.abstractEvolution of the damping ratio for Bragg wavenumbers in the range 32-43 rad/m is evaluated for oil slicks of different composition released in the open ocean and allowed to develop naturally. The study uses quad-polarimetric L-band airborne synthetic aperture radar data acquired over three mineral oil emulsion releases of different, known oil-to-water ratio, and a near-coincident release of 2-ethylhexyl oleate that served as a biogenic look-alike. The experiment occurred during the 2015 Norwegian oil-on-water exercise in the North Sea during a period of relatively high winds (~12 m/s). NASA’s Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) was used to repeatedly image the slicks over a period of eight hours, capturing the slicks’ early development and providing a time series from which to track the evolution of the slicks’ size, position, and radiometric characteristics. Particular emphasis is given in this analysis to identification of zones of higher damping ratio within the slicks (zoning) as potential indicators of thicker oil, and to comparison of the evolution of emulsion and plant oil damping ratios. It was found that all mineral oil slicks initially exhibited zoning apparent in VV, HH, and HV intensities, and that the areas of higher damping ratio persisted the longest for the highest oil content emulsion (80% oil by volume). In contrast, zoning was not unambiguously evident for plant oil at any time from 44 minutes to 8.5 hours after release. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.en_US
dc.description.sponsorshipACKNOWLEDGEMENTS We are grateful to the Norwegian Clean Seas Association for Operating Companies for arranging and executing the NORSE2015 experiment during their annual exercise and for preparation of the mineral oil emulsions that were released. This work was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the U.S. National Aeronautics and Space Administration (NASA). The Norwegian Centre for Integrated Remote Sensing and Forecasting for Arctic operations (CIRFA) provided financial support through their Research Council of Norway grant #237906. The UAVSAR data are courtesy of NASA/Jet Propulsion Laboratory. Mention of trade names or commercial products is not an endorsement or recommendation for use by the U.S. Government.en_US
dc.descriptionLink to publishers version: 10.1117/12.2241266en_US
dc.identifier.citationProc. SPIE 10003, SAR Image Analysis, Modeling, and Techniques XVI, 100030Ken_US
dc.identifier.cristinIDFRIDAID 1399505
dc.identifier.doi10.1117/12.2241266
dc.identifier.urihttps://hdl.handle.net/10037/10590
dc.language.isoengen_US
dc.publisherSPIE (International Society for Optics and Photonics)en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400en_US
dc.titleCharacterization and discrimination of evolving mineral and plant oil slicks based on L-band synthetic aperture radar (SAR)en_US
dc.typePeer revieweden_US


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