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Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/18510
Título

Relative contribution of temperature and salinity to ocean acoustic reflectivity

AutorSallarès, Valentí ; Biescas, Berta ; Buffett, Grant ; Carbonell, Ramón ; Dañobeitia, Juan José ; Pelegrí, Josep Lluís
Palabras claveSeismic reflectivity
Temperature
Salinity
Fecha de publicaciónoct-2009
EditorAmerican Geophysical Union
CitaciónGeophysical reserach letters 36: L00D06 (2009)
ResumenMarine seismic data display laterally coherent reflectivity from the water column that is attributed to fine-scale oceanic layering. The amplitude of the different reflections is the expression of acoustic impedance contrasts between neighbouring water masses, and therefore water reflectivity maps the ocean's vertical sound speed and density (i.e., temperature and salinity) variations. Here we determine the relative contribution of each parameter by computing the temperature and salinity partial derivatives of sound speed and density, and using them to estimate reflection coefficients from a real oceanographic dataset. The results show that the mean contribution of density variations is 5–10%, while 90–95% is due to sound speed variations. On average, 80% of reflectivity comes from temperature contrasts. Salinity contribution averages 20%, but it is highly variable and reaches up to 40% in regions prone to diffusive convection such as the top of the Mediterranean Undercurrent in the Gulf of Cadiz
Descripción6 pages, 3 figures
Versión del editorhttp://dx.doi.org/10.1029/2009GL040187
URIhttp://hdl.handle.net/10261/18510
DOI10.1029/2009GL040187
ISSN0094-8276
E-ISSN1944-8007
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