Inverted echo sounder measurement of dynamic height through an ENSO cycle in the central equatorial Pacific

A four-year record from an inverted echo sounder deployed near Palmyra Island at 6 degrees N in the central Pacific Ocean is compared with a simultaneous record of subsurface pressure from this island lagoon. A factor m, converting round-trip acoustic travel time to surface dynamic height relative t...

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Bibliographic Details
Published in:IEEE journal of oceanic engineering 1990-10, Vol.15 (4), p.380-383
Main Authors: Wimbush, M., Chiswell, S.M., Lukas, R., Donohue, K.A.
Format: Article
Language:English
Subjects:
Acoustic measurements
Acoustics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Instruments
Marine
Ocean temperature
Physics
Pressure gauges
Pressure measurement
Pulse measurements
Sea measurements
Sea surface
Time measurement
Underwater communication
Underwater sound
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Summary:A four-year record from an inverted echo sounder deployed near Palmyra Island at 6 degrees N in the central Pacific Ocean is compared with a simultaneous record of subsurface pressure from this island lagoon. A factor m, converting round-trip acoustic travel time to surface dynamic height relative to a deep pressure level, was estimated from the ratio of the spectra of the two records in the energetic synoptic oscillation band. Year-to-year variation in m was not statistically significant. For the overall record, m was found to be -70+or-8 dynamic m/s, where the error bounds represent a 90% confidence interval. This is consistent with first-baroclinic-mode excitation.< >
ISSN:0364-9059
1558-1691
DOI:10.1109/48.103534