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dc.contributor.authorSanford, Thomas B.  Concept link
dc.contributor.authorPrice, James F.  Concept link
dc.contributor.authorGirton, James B.  Concept link
dc.date.accessioned2011-07-25T19:58:54Z
dc.date.available2011-12-01T09:29:41Z
dc.date.issued2011-06
dc.identifier.citationJournal of Physical Oceanography 41 (2011): 1041–1056en_US
dc.identifier.urihttps://hdl.handle.net/1912/4725
dc.descriptionAuthor Posting. © American Meteorological Society, 2011. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 41 (2011): 1041–1056, doi:10.1175/2010JPO4313.1.en_US
dc.description.abstractThree autonomous profiling Electromagnetic Autonomous Profiling Explorer (EM-APEX) floats were air deployed one day in advance of the passage of Hurricane Frances (2004) as part of the Coupled Boundary Layer Air–Sea Transfer (CBLAST)-High field experiment. The floats were deliberately deployed at locations on the hurricane track, 55 km to the right of the track, and 110 km to the right of the track. These floats provided profile measurements between 30 and 200 m of in situ temperature, salinity, and horizontal velocity every half hour during the hurricane passage and for several weeks afterward. Some aspects of the observed response were similar at the three locations—the dominance of near-inertial horizontal currents and the phase of these currents—whereas other aspects were different. The largest-amplitude inertial currents were observed at the 55-km site, where SST cooled the most, by about 2.2°C, as the surface mixed layer deepened by about 80 m. Based on the time–depth evolution of the Richardson number and comparisons with a numerical ocean model, it is concluded that SST cooled primarily because of shear-induced vertical mixing that served to bring deeper, cooler water into the surface layer. Surface gravity waves, estimated from the observed high-frequency velocity, reached an estimated 12-m significant wave height at the 55-km site. Along the track, there was lesser amplitude inertial motion and SST cooling, only about 1.2°C, though there was greater upwelling, about 25-m amplitude, and inertial pumping, also about 25-m amplitude. Previously reported numerical simulations of the upper-ocean response are in reasonable agreement with these EM-APEX observations provided that a high wind speed–saturated drag coefficient is used to estimate the wind stress. A direct inference of the drag coefficient CD is drawn from the momentum budget. For wind speeds of 32–47 m s−1, CD ~ 1.4 × 10−3.en_US
dc.description.sponsorshipThe Office of Naval Research supported the development of the EM-APEX float system through SBIR Contract N00014-03-C-0242 to Webb Research Corporation and with a subcontract to APL-UW. Sanford and J. Girton were supported by the Office of Naval Research through GrantsN00014-04-1-0691 and N00014- 07-1-024, and J. Price was supported through Grant N00014-04-1-0109.en_US
dc.format.mimetypetext/plain
dc.format.mimetypeapplication/pdf
dc.format.mimetypeapplication/zip
dc.language.isoen_USen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttps://doi.org/10.1175/2010JPO4313.1
dc.subjectHurricanesen_US
dc.subjectOcean dynamicsen_US
dc.subjectProfilersen_US
dc.subjectAir-sea interactionsen_US
dc.titleUpper-ocean response to Hurricane Frances (2004) observed by Profiling EM-APEX floatsen_US
dc.typeArticleen_US
dc.identifier.doi10.1175/2010JPO4313.1


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