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Direct ocean surface velocity measurements from space: Improved quantitative interpretation of Envisat ASAR observations

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dc.contributor.author Johannessen, Johnny A.
dc.contributor.author Chapron, B.
dc.contributor.author Collard, F.
dc.contributor.author Kudryavtsev, Vladimir
dc.contributor.author Mouchet, A.
dc.contributor.author Akimov, D.
dc.contributor.author Dagestad, Knut-Frode
dc.date.accessioned 2009-10-14T10:56:55Z
dc.date.available 2009-10-14T10:56:55Z
dc.date.issued 2008-11-29
dc.identifier.citation Geophysical Research Letters 35(L22608), 6 pp. en
dc.identifier.issn 0094–8276
dc.identifier.uri http://dx.doi.org/10.1029/2008GL035709
dc.identifier.uri http://hdl.handle.net/1956/3520
dc.description.abstract Previous analysis of Advanced Synthetic Aperture Radar (ASAR) signals collected by ESA’s Envisat has demonstrated a very valuable source of high-resolution information, namely, the line-of-sight velocity of the moving ocean surface. This velocity is estimated from a Doppler frequency shift, consistently extracted within the ASAR scenes. The Doppler shift results from the combined action of near surface wind on shorter waves, longer wave motion, wave breaking and surface current. Both kinematic and dynamic properties of the moving ocean surface roughness can therefore be derived from the ASAR observations. The observations are compared to simulations using a radar imaging model extended to include a Doppler shift module. The results are promising. Comparisons to coincident altimetry data suggest that regular account of this combined information would advance the use of SAR in quantitative studies of ocean currents. en
dc.language.iso eng en
dc.publisher American Geophysical Union en
dc.title Direct ocean surface velocity measurements from space: Improved quantitative interpretation of Envisat ASAR observations en
dc.type Peer reviewed en
dc.type Journal article en
dc.subject.nsi VDP::Matematikk og Naturvitenskap: 400 en


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