Program and Agenda

Abstract

CHARACTERIZATION OF THE ENERGY CASCADE USING HIGH RESOLUTION MULTICHANNEL SEISMIC DATA

We analyze multichannel seismic data acquired around the thermocline (30 to 150 m deep) along profiles of 30 km using a high resolution system with a peak frequency of 150 Hz. The lateral and vertical resolution is ~13 m and 2 m respectively, allows us to characterize the energy cascade of the Alboran Sea with unprecedented lateral resolution. The spectral analysis shows characteristics of three different processes. At largest horizontal wavenumbers, (1 to 10 km-1), the spectral slope is -2.01 + 0.09 in agreement with that described for internal waves, whereas at the shortest wavenumbers (32 to 70 km-1), we obtain a slope of -1.54 ± 0.56, which corresponds to a turbulent spectra. In between, it can be distinguished a third domain with slope of -2.89 + 0.32 in the range of [10.2 to 30.4 km-1]. The slope, the wavenumber range and the fact that our data was acquired in an area with significantly strong stratification and shear due to the constant exchange of Atlantic and Mediterranean waters, suggest that this domain could be dominated by the formation of Kelvin-Helmholtz instabilities.

ePoster:

Authors

Mojica, J., intitut de ciencies del mar, Spain, jfmojica@icm.csic.es

Sallares, V., institut de ciencies del mar, Spain, vsallares@icm.csic.es

Biescas, B., institut de ciencies del mar, Spain, biescas@icm.csic.es

Klaeschen, D., Geomar, Germany, dklaeschen@geomar.de

Bornstein, G., institut de ciencies del mar, Spain, bornstein@icm.csic.es

Details

Poster presentation

Session #:012
Date: 2/27/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: Yes

PosterID: 1503