A Century of Sea Level Measurements at Newlyn, Southwest England

Bradshaw, Elizabeth; Woodworth, Philip L.; Hibbert, Angela; Bradley, Leslie; Pugh, David; Fane, C.; Bingley, R. M.

doi:10.1080/01490419.2015.1121175

Cited by 20 publications

(17 citation statements)

References 69 publications

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“…[] used the long tide gauge record from Marseille and attributed long‐term changes in extreme sea levels to those in MSL, although with differences from decade to decade, generally confirming findings from other southern European stations [ Marcos et al ., ]. In northern Europe, recent comparisons of trends in MSL, and sea level extremes can be found for the English Channel [ Haigh et al ., ], and Newlyn in particular [ Bradshaw et al ., ], and the Baltic [e.g., Suursaar and Sooäär , ]. Mudersbach et al .…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal changes in extreme sea levels along the coasts of the North Atlantic and the Gulf of Mexico

Marcos

Woodworth

2017

JGR Oceans

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Extreme sea levels along the densely monitored coasts of the North Atlantic Ocean and the Gulf of Mexico have been investigated using high‐frequency tide gauge measurements in the GESLA‐2 data set (http://www.gesla.org). Our results, based on nontidal residuals and skew surges in records since 1960, confirm that mean sea level (MSL) is a major, but not a unique, driver of extremes. Regionally coherent linear trends and correlations with large‐scale climate patterns are found in extreme events, even after the removal of MSL. A similar conclusion, that MSL is a major but not the only driver of extremes, comes from a small number of long records starting in the mid‐19th century. The records show slight increases in the intensity of extreme episodes at centennial time scales, together with multidecadal variability unrelated to MSL. Objective statistical criteria have been used to investigate whether extreme sea level distributions are stationary or not, resulting in nonstationarity being favored in many records, with or without accounting for changes in MSL. Extremes have been found to favor a non‐Gumbel behavior at many locations, with implications for the accuracy of return levels for coastal engineering.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal changes in extreme sea levels along the coasts of the North Atlantic and the Gulf of Mexico

Marcos

Woodworth

2017

JGR Oceans

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“…The decrease observed at Brest between 1880 and 1920 may be due to harbour development and/or dredging (see above). This underlines the importance of sea level data archaeology, for research studies related to long-term changes (Pouvreau, 2008;Woodworth et al, 2010;Marcos et al, 2011;Jay, 2013, 2017;Ray and Talke, 2019;Bradshaw et al, 2015Bradshaw et al, , 2020.…”

Section: Variationsmentioning

confidence: 80%

Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018

2021

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Abstract. We investigated the long-term changes of the principal tidal component M2 along North Atlantic coasts, from 1846 to 2018. We analysed 18 tide gauges with time series starting no later than 1940. The longest is Brest with 165 years of observations. We carefully processed the data, particularly to remove the 18.6-year nodal modulation. We found that M2 variations are consistent at all the stations in the North-East Atlantic (Cuxhaven, Delfzijl, Hoek van Holland, Newlyn, Brest), whereas some discrepancies appear in the North-West Atlantic. The changes started long before the 20th century and are not linear. The secular trends in M2 amplitude vary from one station to another; most of them are positive, up to 2.5 mm/yr at Wilmington since 1910. Since 1990, the trends switch from positive to negative values in the North-East Atlantic. Concerning the possible causes of the observed changes, the similarity between the North Atlantic Oscillation and M2 variations in the North-East Atlantic suggests a possible influence of the large-scale atmospheric circulation on the tide. Our statistical analysis confirms large correlations at all the stations in the North-East Atlantic. We discuss a possible underlying mechanism. A different spatial distribution of mean sea level (corresponding to water depth) from one year to another, depending on the low-frequency sea-level pressure patterns, could impact the propagation of the tide in the North Atlantic basin. However, the hypothesis is at present unproven.

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“…2). Heights were ultimately expressed relative to ODN datum, which was based on MSL measured at Newlyn during May 1915-April 1921 (Jolly & Wolff 1922;Bradshaw et al 2016).…”

Section: Odl and Odnmentioning

confidence: 99%

Sea Level Change in Great Britain between 1859 and the Present

Woodworth

2017

Geophysical Journal International

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Short records of sea level measurements by the Ordnance Survey at 31 locations in 1859-1860, together with recent Mean Sea Level (MSL) information from the UK tide gauge network, have been used to estimate the average rates of sea level change around the coast of Great Britain since the mid-19th century. Rates are found to be approximately 1 mm yr −1 in excess of those expected for the present day based on geological information, providing evidence for a climate-change related component of the increase in UK sea level. In turn, the rates of change of MSL for the past 60 yr are estimated to be ∼1 mm yr −1 in excess of the long-term rates since 1859, suggesting an acceleration in the rate of sea level rise between the 19th and 20th/21st centuries. Although the historical records are very short (approximately a fortnight), this exercise in 'data archaeology' shows how valuable to research even the shortest records can be, as long as the measurements were made by competent people and the datums of the measurements were fully documented.

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A Century of Sea Level Measurements at Newlyn, Southwest England

Cited by 20 publications

References 69 publications

Spatiotemporal changes in extreme sea levels along the coasts of the North Atlantic and the Gulf of Mexico

Spatiotemporal changes in extreme sea levels along the coasts of the North Atlantic and the Gulf of Mexico

Large-scale changes of the semidiurnal tide along North Atlantic coasts from 1846 to 2018

Sea Level Change in Great Britain between 1859 and the Present

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