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dc.contributor.authorRichman, James G.  Concept link
dc.contributor.authorWunsch, Carl  Concept link
dc.contributor.authorHogg, Nelson G.  Concept link
dc.date.accessioned2018-10-01T19:12:02Z
dc.date.available2018-10-01T19:12:02Z
dc.date.issued2018-08
dc.identifier.citationRichman, J. G., Wunsch, C., & Hogg, N. G. (2018). Space and time scales of mesoscale motion in the western North Atlantic. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/10608
dc.identifier.urihttps://hdl.handle.net/1912/10608
dc.descriptionAlso published as Reviews of Geophysics and Space Physics, Vol. 15, No. 4, November 1977, pp. 385-420en_US
dc.description.abstractFrom moored data, primarily temperature, of the Mid-Ocean Dynamics Experiment (ModeI) and its successor experiments we find a statistical description of the mesoscale variability. In the ModeI area itself the spectral characteristics of the thermocline and the deep water are different. The thermocline is conveniently described as being made up of three spectral bands: a ' low-frequency' band dominated by zonal velocity fluctuations, an 'eddy-containing' band in which the velocity field is nearly isotropic, and a 'high-frequency' band consistent with models of geostrophic turbulence. In the deep water the zonal dominance at low frequencies is not apparent, and there is enhanced energy at periods of 20-50 days. Vertical structure scales with WK BJ approximation in the high-frequency band but not in the lower frequencies, where low vertical modes dominate the motion. Linear models do not adequately describe the data in the ModeI region. Differences between rough and smooth topography regions are clearly seen only at 1500 m, where there is a loss of energy consistent with a reduced barotropic motion. Other differences, while apparently real, are small. It is found, consistent with the results of Schmitz (1976a), that the ModeI region is atypical of the midocean in that large changes of energy level are found elsewhere. A region due east of ModeI has slightly reduced kinetic energy levels in the main thermocline, but deep energy levels are much lower. Potential energy is less variable than kinetic; in the eastern region the frequency spectra change structure slightly. Linear models may be more adequate there. With more than 2 years of data, no statistically significant heat flux was found in the ModeI area, except for a weak zonal flux in the deep water. There is no direct evidence for baroclinic instability as a significant mechanism of eddy generation; the Gulf Stream is a possible, if unconfirmed, source.en_US
dc.description.sponsorshipPrepared for the Office of Naval Research under Contracts N00014-66-C-0241; NR 083-004~ N00014-74-C-0262; NR 083-004 and N00014-76-C-0197; NR 083-400; and for the National Science Foundation under Grants GX-29054, GX-29034, OCE 75-03962 and ID0-82534.en_US
dc.language.isoen_USen_US
dc.publisherWoods Hole Oceanographic Institutionen_US
dc.relation.ispartofseriesWHOI Technical Reportsen_US
dc.relation.ispartofseriesWHOI-78-45en_US
dc.subjectOcean temperatureen_US
dc.subjectThermoclinesen_US
dc.titleSpace and time scales of mesoscale motion in the western North Atlanticen_US
dc.typeTechnical Reporten_US
dc.identifier.doi10.1575/1912/10608


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