Abstract
Approximately 15 months of data are now available from the 75-Hz ATOC transmissions from the Pioneer Seamount off Half Moon Bay, CA to horizontal arrays at 11 U.S. Navy horizontal arrays in the northeast Pacific, two vertical arrays, one near Hawaii and the other near Kiritimati (Christmas) Island. The data demonstrate that ocean basin temperatures can be determined with millidegree precision. Travel time variations at tidal frequencies agree well with predicted values. Low-frequency travel time variations provide range and depth averaged temperatures that are comparable to seasonal temperature variations derived from historical oceanography (Levitus94). They are also comparable (but not identical) to temperature variations derived from contemporaneous sea surface height variations measured by satellite altimetry. Preliminary results of combining the acoustic and altimetric data in a numerical general circulation model of the North Pacific are also available.
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