Tracking a cold filament with matched-field inversion

V. Corré,
SiPLAB - FCT, University of Algarve
Campus de Gambelas,
PT-8000 Faro, Portugal

Comments: download file (pdf )
Ref.: SiPLAB Report 02/02, University of Algarve, 2002.

Abstract: The estimation of range-dependent properties with a single array-source pair is a problem which solution may not be unique. Being aware that this dificulty is particularly true when data are contaminated with noise (i.e., in all real cases), our objective was to obtain a variability trend rather than very accurate estimates of the properties. In other words, detection and global tracking of the filaments were of prime interest rather than detailed mapping of the sea-temperature (or sound-speed)  field. While acoustic travel-time tomography [1] is now a well-developed technique for large- scale, deep-ocean regions, it is less adapted for studying  filaments which are mesoscale features that develop in relatively shallow (400 m) areas. Using matched-field processing to estimate ocean sound speed [2, 3] is a more recent approach than tomography. However this approach has already shown good results and can treat any type of environment equally. It is therefore the approach adopted in this study.

ACKNOWLEDGMENT: this work was partially  supported by ATOMS project (FCT, Portugal)