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Monitoring temperature variability along the California Coast using Acoustic Tomography

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Author
Morvillez, Thierry
Date
1997-09
Advisor
Chiu, Ching-Sang
Collins, Curtis A.
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Abstract
The electronic emissions of a low frequency sound source placed by the Acoustic Thermometry of Ocean Climate (ATOC) project on Pioneer Seamount were monitored by a bottom lying receiver on Sur Ridge from April 1996 to February 1997. The processed signals show a stable arrival pattern that was repeated in all the transmissions during the 11 months. Using the processed data, a tomographic analysis to study the coastal ocean variability along this California transmission path was conducted. Systematically, the analysis involved forward acoustic modeling of the arrival structure using ray theory, associating the observed arrivals with the modeled arrivals, extracting the travel times of the arrivals, inverting the travel times for temporal and spatial temperature changes, and interpreting the observed temperature variations. In particular, the tomographic estimate was compared to the temperature and wind measurements from an in situ mooring deployed by the Monterey Bay Aquarium Research Institution (MBARI). The comparison show that the tomographic estimate is of high quality and that the observed temperature variations were linked to coastal upwelling and downwelling events. The data, methods and result, demonstrating fully the feasibility of using tomography to study coastal temperature variability in central California on a long term basis, are presented
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http://hdl.handle.net/10945/8699
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    Signal processing and preliminary results in the 1988 Monterey Bay Tomography Experiment. 

    Dees, Robert Charles. (1989);
    Ocean acoustic tomography is particularly suited to observing mesoscale dynamic processes, which may not be adequately observed by more conventional methods. Ships and buoys are limited in their sampling rates by location ...
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    Analysis of temperature variability between Davidson Seamount and Sur Ridge : the tomographic inverse problem 

    Neander, David O. (Monterey, California. Naval Postgraduate School, 2002-06);
    As part of the Innovative Coastal-Ocean Observing Network (ICON), a receiver located on Sur Ridge monitored transmissions of low frequency tomography signals from a sound source on Davidson Seamount. The received signals ...
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    Acoustic tomographic estimate of ocean advective heat flux [electronic resource] : a numerical assessment in the Norwegian Sea 

    Barock, Richard Timothy (Monterey, California. Naval Postgraduate School, 1990-06);
    In a computer simulation experiment, acoustic tomography is assessed as a means of measuring the seasonal flux of heat advected by the Norwegian Atlantic Current. Oceanic heat flux has traditionally been measured by various ...
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