Skip to main content

Free Content Drifter spectra and diffusivities

Download Article:
(PDF 706.064453125 kb)
The relationships between Eulerian and Lagrangian (or drifter) diffusivities and spectra are explored in detail using the Lagrangian correlation predictor due to Corrsin (1959). The analysis, applicable to homogeneous, isotropic velocity fields shows that an important dimensionless parameter in the Euler-Lagrange transformations is the ratio α of Eulerian integral TE to advective Ta time scales. It is found that the diffusivity may be approximated to within 10% by the function q2TE (q2 + α2)−1/2 where 2 is the mean-square velocity component and q ≃ 0.63. This result is found to be insensitive to the shape of the Eulerian spectra. It is also shown that a (wavenumber)−3 energy spectrum may be identified in Lagrangian frequency space by a corresponding (frequency)−3 spectrum. The relationships between drifter and fixed current meter spectra and time-scales are also explored. It is suggested that for regions of strong mean flow, U > , that the diffusivity might well be approximated by q √3 UTu where Tu is the mooring velocity time scale.

16 References.

No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 1985-02-01

More about this publication?
  • The Journal of Marine Research publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. In the area of biology, studies involving coupling between ecological and physical processes are preferred over those that report systematics. Authors benefit from thorough reviews of their manuscripts, where an attempt is made to maximize clarity. The time between submission and publication is kept to a minimum; there is no page charge.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more