Common turbulent signature in sea surface temperature and chlorophyll maps

Details Common turbulent signature in sea surface temperature and chlorophyll maps Common turbulent signature in sea surface temperature and chlorophyll maps

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3423602n&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 23, CiteID L23602

Physics

Geophysics

5

Nonlinear Geophysics: Fractals And Multifractals, Nonlinear Geophysics: Self-Organization, Nonlinear Geophysics: Turbulence (3379, 4568, 7863), Oceanography: General: Ocean Observing Systems, Oceanography: Physical: Eddies And Mesoscale Processes

Scientific paper

Oceans and 2D turbulence present similar characteristics, as for instance the dominant role played by eddies in energy and matter transport. However, providing a complete justification of this analogy is difficult, as it requires knowledge of the ocean's dynamic state at different instants and over large scales. Recently, new techniques coming from the Microcanonical Multifractal Formalism have made it possible to infer the streamlines from the analysis of satellite images of some scalar variables. In this paper, we will show that this information is enough to characterize the scaling properties of the energy cascade, which is manifested as a multifractal signature; further, the multifractal signature is obtained at each location in a local basis. Different scalars obtained from satellite measurements such as Sea Surface Temperature or Surface Chlorophyll Concentration present essentially the same multifractal structure, which is interpreted as a consequence of the pervading character of the turbulent advection at the scales of observation.

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