Secular Changes in the Oceanic Tides at Brest, 1711?1936

Cartwright, David E.

doi:10.1111/j.1365-246x.1972.tb05826.x

Cited by 49 publications

(43 citation statements)

References 7 publications

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“…Long term changes in the tide at particular locations have been noted a number of times before (e.g. Cartwright 1971Cartwright , 1972Godin, 1995;Pouvreau, 2008). However, it has not been until recently that more comprehensive regional studies have been undertaken, with quite intriguing findings.…”

Section: Timing or Calibration Errors Or Other Data Irregularitiesmentioning

confidence: 99%

A survey of recent changes in the main components of the ocean tide

Woodworth

2010

Continental Shelf Research

151

148

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Changes in the ocean tide during the 20 th century have been reported for several parts of the world by different authors. However, it has not always been clear whether the observed changes have been local or regional in scale. This paper reports on a survey of tidal changes in recent decades using a quasi-global data set of tide gauge information. Little evidence has been found in Europe or the Far East (including Australasia and Asia) for the extensive regional changes to the main tidal constituents reported recently for N America. However, evidence for change in smaller regions can be identified wherever the density of tide gauge information allows. Therefore, it seems that tidal changes may be commonplace around the world, although not necessarily with large spatial scales.All of the reported changes have been difficult to explain. However, it is hoped that quasi-global surveys such as the present one may eventually provide further insights.

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Section: Timing or Calibration Errors Or Other Data Irregularitiesmentioning

confidence: 99%

A survey of recent changes in the main components of the ocean tide

Woodworth

2010

Continental Shelf Research

151

148

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“…Cartwright (1972) analyzed the tide record from 1711 to 1936 at Brest, France, and found a 1% (100 yr)…”

Section: ϫ2mentioning

confidence: 99%

Tales of the Venerable Honolulu Tide Gauge*

Colosi

Munk

2006

Journal of Physical Oceanography

108

100

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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 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 ϭ 16.6 and 22.1 cm, a IT ϭ 1.8 and 1.0 cm for surface and internal tides at Honolulu and Hilo, respectively. The proposed model a TT (t) ϭ a ST ϩ a IT cos 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 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 ␦a TT ϭ O(0.1␦h SL ). The authors attribute the recorded secular increase in the Honolulu M 2 amplitude from a TT ϭ 16.1 to 16.9 cm between 1915 and 2000 to a 28°rotation of the internal tide vector in response to ocean warming.

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“…Secular changes in tides are, in fact, not uncommonly detected when measurements over a long timespan are examined [Cartwright, 1972]. Flick et al [2003] recently compiled statistics for rates in mean tidal range for 90 tide gauges in the United States, as Woodworth et al [1991] had previously done for 13 British ports.…”

Section: Introductionmentioning

confidence: 99%

Secular changes in the solar semidiurnal tide of the western North Atlantic Ocean

Ray¹

2009

Geophysical Research Letters

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[1] An analysis of twentieth century tide gauge records reveals that the solar semidiurnal tide S 2 has been decreasing in amplitude along the eastern coast of North America and at the mid-ocean site Bermuda. In relative terms the observed rates are unusually large, of order 10% per century. Periods of greatest change, however, are inconsistent among the stations, and roughly half the stations show increasing amplitude since the late 1990s. Excepting the Gulf of Maine, lunar tides are either static or slightly increasing in amplitude; a few stations show decreases. Large changes in solar, but not lunar, tides suggest causes related to variable radiational forcing, but the hypothesis is at present unproven.

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Secular Changes in the Oceanic Tides at Brest, 1711?1936

Cited by 49 publications

References 7 publications

A survey of recent changes in the main components of the ocean tide

A survey of recent changes in the main components of the ocean tide

Tales of the Venerable Honolulu Tide Gauge*

Secular changes in the solar semidiurnal tide of the western North Atlantic Ocean

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