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

Woodworth, Philip L.

doi:10.1016/j.csr.2010.07.002

Cited by 151 publications

(165 citation statements)

References 31 publications

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“…Such changes are known to have occurred at many locations (e.g. Woodworth 2010) but are in general much smaller than could affect the MTL-MSL computed here. At locations where the tide is changing rapidly then a more sophisticated analysis would be required.…”

Section: Methodsmentioning

confidence: 94%

Differences between mean tide level and mean sea level

Woodworth

2016

J Geod

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This paper discusses the differences between Mean Tide Level (MTL) and Mean Sea Level (MSL) as demonstrated using information from a global tide gauge data set. The roles of the two main contributors to differences between MTL and MSL (the M4 harmonic of the M2 semidiurnal tide, and the combination of the diurnal tides K1 and O1) are described, with a particular focus on the spatial scales of variation in MTL-MSL due to each contributor. Findings from the tide gauge data set are contrasted with those from a state-of-the-art global tide model. The study is of interest within tidal science, but also has practical importance regarding the type of mean level used to define land survey datums. In addition, an appreciation of MTL-MSL difference is important in the use of the historical sea level data used in climate change research, with implications for some of the data stored in international databanks. Particular studies are made of how MTL and MSL might differ through the year, and if MTL is measured in daylight hours only, as has been the practice of some national geodetic agencies on occasions in the past.

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Section: Methodsmentioning

confidence: 94%

Differences between mean tide level and mean sea level

Woodworth

2016

J Geod

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“…Müller (2011) carried out an extensive analysis of many North Atlantic stations and did see a widespread negative offset or at least a negative trend in many North Atlantic M 2 amplitudes and speculated that this may be associated with global warming. Woodworth (2010) itemized changes in tidal components in many parts of the world but could not ascribe clear processes to these changes.…”

Section: Results From the Data Analysismentioning

confidence: 99%

Climate Change, Mean Sea Level and High Tides in the Bay of Fundy

et al. 2012

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Global warming is predicted to result in a rise in sea level which will lead to increased flood risk. Two other factors that will affect high water are the existing trends in mean sea level and changing tides. We illustrate here that in the Bay of Fundy and Gulf of Maine these two are related. An analysis of long-term sea level records shows that, independent of global warming related to climate change, sea level and tidal range have been increasing in this system. Our numerical model investigation indicates that recent changes in sea level, attributed in part to post-glacial rebound, are giving rise to increasing tides. The combined effects of modern sea level rise, global warming induced sea level rise, and the expanded tidal range they induce, will produce a significant increase in the high water level, much greater than that found when considering modern climate-induced sea level changes in isolation. We are predicting a dramatic increase in the risk of flooding at higher high water during the twenty-first century.RÉSUMÉ [Traduit par la rédaction] Le réchauffement climatique devrait entraîner une hausse du niveau de la mer, d'où l'augmentation des risques d'inondation. Mais deux autres facteurs sont à l'origine de cette hausse, soit les tendances actuelles liées au niveau moyen de la mer et au changement dans l'amplitude des marées. Dans notre étude, nous démontrons que ces deux facteurs sont interreliés dans la baie de Fundy et dans le golfe du Maine. L'analyse des relevés du niveau de la mer à long terme démontre que le niveau de la mer et l'amplitude des marées sont en hausse dans ce système, abstraction faite du réchauffement causé par les changements climatiques. L'étude que nous avons effectuée au moyen d'un modèle numérique fait ressortir que les changements survenus récemment dans le niveau de la mer, attribuables en partie au relèvement post-glaciaire, expliquent l'amplitude croissante des marées. L'effet de l'élévation actuelle du niveau de la mer, conjugué à celui de l'élévation du niveau de la mer provoquée par le réchauffement climatique et de l'amplitude croissante des marées que ces deux phénomènes induisent augmenteront considérablement le niveau des hautes eaux, beaucoup plus que ce qu'indiquent les conclusions des études sur les changements du niveau de la mer induits par le climat actuel pris isolément. Nous prévoyons une augmentation importante des risques d'inondation dans des conditions de pleine mer supérieure au cours du XXI e siècle.

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“…hourly or more frequent) tidal datasets such as the Global Extreme Sea Level Analysis (GESLA) dataset and its follow-on GESLA-2: this issue is examined in detail in Woodworth (2010). Since 1933, tide gauge records have been collected and distributed by the Permanent Service for Mean Sea Level (PSMSL).…”

Section: Monitoring Sea Level With Tide Gaugesmentioning

confidence: 99%

Monitoring Sea Level in the Coastal Zone with Satellite Altimetry and Tide Gauges

et al. 2016

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We examine the issue of sustained measurements of sea level in the coastal zone, first by summarizing the long-term observations from tide gauges, then showing how those are now complemented by improved satellite altimetry products in the coastal ocean. We present some of the progresses in coastal altimetry, both from dedicated reprocessing of the radar waveforms and from the development of improved corrections for the atmospheric effects. This trend towards better altimetric data at the coast comes also from technological innovations such as Ka-band altimetry and SAR altimetry, and we discuss the advantages deriving from the AltiKa Ka-band altimeter and the SIRAL altimeter on CryoSat-2 that can be operated in SAR mode. A case study along the UK coast demonstrates the good agreement between coastal altimetry and tide gauge observations, with root mean square differences as low as 4 cm at many stations, allowing the characterization of the annual cycle of sea level along the UK coasts. Finally, we examine the evolution of the sea level trend from the open to the coastal ocean along the western coast of Africa, comparing standard and coastally improved products. Different products give different sea level trend profiles, so the recommendation is that additional efforts are needed to study sea level trends in the coastal zone from past and present satellite altimeters. Further improvements are expected from more refined processing and screening of data, but in particular from the constant improvements in the geophysical corrections.

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

Cited by 151 publications

References 31 publications

Differences between mean tide level and mean sea level

Differences between mean tide level and mean sea level

Climate Change, Mean Sea Level and High Tides in the Bay of Fundy

Monitoring Sea Level in the Coastal Zone with Satellite Altimetry and Tide Gauges

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