Characterization of thermohaline staircases in the Tyrrhenian sea using stochastic heterogeneity mapping

Autor: César R. Ranero, Charles A. Hurich, Valentí Sallarès, Richard Hobbs, Dirk Klaeschen, Grant Buffett, Ekaterina Vsemirnova
Rok vydání: 2013
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
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Popis: ICA 2013 MOntreal, Acoustical Oceanography Session 2aAO: Seismic Oceanography, 2-7 june 2013, Montreal, Canada.-- 7 pages, 3 figures, 1 table
Processed multi-channel seismic (MCS) data acquired in the Tyrrhenian Sea in April-May 2010 provide images of oceanic thermohaline staircases. Using Stochastic Heterogeneity Mapping we characterize spatial reflector variations. This method is based on the band-limited von Kármán function. For scale sizes smaller than the correlation length, the von Kármán model describes a power law (fractal) process. We are most interested in the extraction of the exponent in the power law (The Hurst exponent) because it allows us to characterize the richness of scales present in the data set. Lower Hurst exponents represent a richer range of wavenumbers and therefore correspond to a broader range of heterogeneity in the observed seismic reflection events. The Hurst exponent is related to the fractal dimension and to the slope in the Garrett-Munk wavenumber spectrum. We interpret a richer range of heterogeneity as indicative of a greater degree of turbulent mixing. Data are presented alongside benchmark calibrations of synthetic seismic data generated from random fractal surfaces. We observe an oscillation in the Hurst exponent spectra as a function of frequency that is interpreted to represent a preferential coupling of energy across different spatial scales
This research was funded by a Marie Curie Intra-European Fellowship (IEF): FP7-PEOPLE-2010-IEF. The data acquisition was funded by Spanish Plan Nacional: CTM2007-66179-C02-01/MAR and Spanish Acción Complementaria CTM2007-66179-C02-02/MAR
Databáze: OpenAIRE
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