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Tales of the Venerable Honolulu Tide Gauge **

Tales of the Venerable Honolulu Tide Gauge ** Surface expressions of internal tides constitute a significant component of the total recorded tide. The internal component is strongly modulated by the time-variable density structure, and the resulting perturbation of the recorded tide gives a welcome look at twentieth-century interannual and secular variability. Time series of mean sea level h SL ( t ) and total recorded M 2 vector a TT ( t ) are extracted from the Honolulu 1905––2000 and Hilo 1947––2000 (Hawaii) tide records. Internal tide parameters are derived from the intertidal continuum surrounding the M 2 frequency line and from a Cartesian display of a TT ( t ), yielding a ST == 16.6 and 22.1 cm, a IT == 1.8 and 1.0 cm for surface and internal tides at Honolulu and Hilo, respectively. The proposed model a TT ( t ) == a ST ++ a IT cos θθ IT ( t ) is of a phase-modulated internal tide generated by the surface tide at some remote point and traveling to the tide gauge with velocity modulated by the underlying variable density structure. Mean sea level h SL ( t ) a surrogate for the density structure and hence for θθ IT ( t ) is coherent with a IT ( t ) within the decadal band 0.2––0.5 cycles per year. For both the decadal band and the century drift the recorded M 2 amplitude is high when sea level is high, according to δδ a TT == O (0.1 δδh SL ). The authors attribute the recorded secular increase in the Honolulu M 2 amplitude from a TT == 16.1 to 16.9 cm between 1915 and 2000 to a 28°° rotation of the internal tide vector in response to ocean warming. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Physical Oceanography American Meteorological Society

Tales of the Venerable Honolulu Tide Gauge **

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References (36)

Publisher
American Meteorological Society
Copyright
Copyright © 2003 American Meteorological Society
ISSN
1520-0485
DOI
10.1175/JPO2876.1
Publisher site
See Article on Publisher Site

Abstract

Surface expressions of internal tides constitute a significant component of the total recorded tide. The internal component is strongly modulated by the time-variable density structure, and the resulting perturbation of the recorded tide gives a welcome look at twentieth-century interannual and secular variability. Time series of mean sea level h SL ( t ) and total recorded M 2 vector a TT ( t ) are extracted from the Honolulu 1905––2000 and Hilo 1947––2000 (Hawaii) tide records. Internal tide parameters are derived from the intertidal continuum surrounding the M 2 frequency line and from a Cartesian display of a TT ( t ), yielding a ST == 16.6 and 22.1 cm, a IT == 1.8 and 1.0 cm for surface and internal tides at Honolulu and Hilo, respectively. The proposed model a TT ( t ) == a ST ++ a IT cos θθ IT ( t ) is of a phase-modulated internal tide generated by the surface tide at some remote point and traveling to the tide gauge with velocity modulated by the underlying variable density structure. Mean sea level h SL ( t ) a surrogate for the density structure and hence for θθ IT ( t ) is coherent with a IT ( t ) within the decadal band 0.2––0.5 cycles per year. For both the decadal band and the century drift the recorded M 2 amplitude is high when sea level is high, according to δδ a TT == O (0.1 δδh SL ). The authors attribute the recorded secular increase in the Honolulu M 2 amplitude from a TT == 16.1 to 16.9 cm between 1915 and 2000 to a 28°° rotation of the internal tide vector in response to ocean warming.

Journal

Journal of Physical Oceanography – American Meteorological Society

Published: Jul 30, 2003

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