A newly reconciled dataset for identifying sea level rise and variability in Dublin Bay

Nejad, Amin Shoari; Parnell, Andrew; Greene, Alice; Thorne, Peter; Kelleher, Brian P.; Devoy, R. J. N.; McCarthy, Gerard

doi:10.5194/os-18-511-2022

Cited by 4 publications

(7 citation statements)

References 24 publications

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“…Ireland is particularly exposed to Atlantic storms, and coastal flooding and erosion are issues that have serious economic and social impacts. Indeed, the rate of SLR in the Dublin Bay area is considered twice the global average [14], which is unprecedented over the last century and faster than expected.…”

Section: Discussionmentioning

confidence: 99%

“…The recent 2019-2024 climate change action plan published by Dublin City Council [16] indicates an increase of approximately 6-7 mm per year between 2000 and 2016, which is almost twice the rate of global SLR. This is surprising, considering that studies over past decades (i.e., between the 1950s and 2000s) in Dublin revealed much lower rates than the global mean SLR [14]. This highlights Dublin as being at particular risk.…”

Section: Introductionmentioning

confidence: 90%

“…O'Brien et al [12] performed a survey of extreme wave events and storm surges in Ireland as far back as 14,680 BP (Before Present) up to 2017. Cámaro García et al [13] highlighted how, based on satellite observations, sea level around Ireland has risen by around 2-3 mm/year since the 1990s but the most recent estimates for the period 2006-2015 indicate a rise of 3.6 mm per year [14]. A recent study by Shoari Nejad et al [14] investigated the sea level trend in Dublin Port by performing a careful quality control of the available tide gauge data.…”

Section: Introductionmentioning

confidence: 99%

“…Cámaro García et al [13] highlighted how, based on satellite observations, sea level around Ireland has risen by around 2-3 mm/year since the 1990s but the most recent estimates for the period 2006-2015 indicate a rise of 3.6 mm per year [14]. A recent study by Shoari Nejad et al [14] investigated the sea level trend in Dublin Port by performing a careful quality control of the available tide gauge data. They concluded that the overall sea level rise is in line with expected trends, but higher rates have been observed since the 1990s.…”

Section: Introductionmentioning

confidence: 99%

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Assessing Coastal Flood Risk in a Changing Climate for Dublin, Ireland

Paranunzio

Guerrini

Dwyer³

et al. 2022

JMSE

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With increasing urban expansion and population growth, coastal urban areas will be increasingly affected by climate change impacts such as extreme storm events, sea level rise and coastal flooding. To address coastal inundation risk for impact studies, integrated approaches accounting for flood hazard modelling, exposure and vulnerability of human and environmental systems are crucial. In this study, we model the impacts of sea level rise on coastal inundation depth for County Dublin, the most extensively urbanized area in Ireland, for the current period and for 2100 under two Representative Concentration Pathways RCP 4.5 and 8.5. A risk-centred approach has been considered by linking the information on coastal flood-prone areas to the exposure of the urban environment, in terms of potential future land cover changes, and to the socioeconomic vulnerability of the population. The results suggest significant challenges for Dublin city and the surrounding coastal areas, with an increase of around 26% and 67% in the number of administrative units considered at very high risk by the end of the century under a RCP 4.5 and 8.5, respectively. This study aims to contribute to existing coastal inundation research undertaken for Ireland by (i) providing a first-level screening of flooding hazards in the study area, (ii) demonstrating how land cover changes and socioeconomic vulnerability can contribute to the level of experienced risk and (iii) informing local authorities and at-risk communities so as to support them in the development of plans for adaptation and resilience.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessing Coastal Flood Risk in a Changing Climate for Dublin, Ireland

Paranunzio

Guerrini

Dwyer³

et al. 2022

JMSE

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“…The Dublin Port tide gauge record, extending back to 1938, is Ireland's longest sea-level time series and provides a useful reference against which to assess the most recent portion of our saltmarsh-based RSL reconstructions. When recalibrated to adjust for biased high-water measurements, the tide gauge indicates RSL in Dublin Bay rose at a rate of 1.1 ± 0.5 mm yr -1 between 1953(Shoari Nejad et al, 2022. Although covering different time intervals, this instrumental rate of RSL rise overlaps with the longer-term rate inferred from our GTG-based approach, and the Dublin tide gauge record plots within the 95% confidence interval of the reconstruction for much of its length (Figure 7c).…”

Section: Comparing the Gtg Record With The Dublin Port Tide Gaugementioning

confidence: 99%

Two Centuries of Relative Sea-Level Rise in Dublin, Ireland, Reconstructed by Geological Tide Gauge

Roseby,

Southall,

Alvarez-Agoues

et al. 2023

OPEN QUAT

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We demonstrate the utility and reproducibility of the saltmarsh foraminifera-based ‘geological tide gauge’ (GTG) approach by developing two independent records of relative sea-level (RSL) change for Dublin, Ireland. Our records, recovered from two different saltmarshes, indicate that RSL rose at a century-scale rate of 1.5 ± 0.9 mm yr–1 over the last 200 years. This compares favourably with the shorter, but more precise, mean sea level (MSL) record from the Dublin Port tide gauge, which indicates long-term (1953–2016 CE) rise at a rate of 1.1 ± 0.5 mm yr–1. When corrected for the influence of glacio-isostatic adjustment our saltmarsh-based reconstruction suggests sea levels in Dublin rose at a rate of 1.6 ± 0.9 mm yr–1 since the start of the 19th century, which is in excellent agreement with the regional value of MSL rise over the same period (1.5 ± 0.2 mm yr–1) calculated from a compilation of tide gauge records around Britain. Whilst our record has decadal-scale temporal resolution (1 sample every 8 years), we are currently unable to resolve multidecadal-scale variations in the rate of sea-level rise which are masked by the size of the vertical uncertainties (± 20 cm) associated with our reconstruction of palaeomarsh-surface elevation. We discuss the challenges of applying the GTG approach in the typically minerogenic saltmarshes of the NE Atlantic margin and outline potential solutions that would facilitate the production of Common Era RSL reconstructions in the region.

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The accurate digitization of historical sea level records

McLoughlin,

McCarthy,

Nolan

et al. 2024

Geoscience Data Journal

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Understanding regional sea level variations is crucial for assessing coastal vulnerability, with accurate sea level data playing a pivotal role. Utilizing historical sea level marigrams can enhance datasets, but current digitization techniques face challenges such as bends and skews in paper charts, impacting sea level values. This study explores often‐overlooked issues during marigram digitization, focusing on the case study of Dún Laoghaire in Ireland (1925–1931). The methodology involves digitizing the original marigram trace and underlying grid to assess offsets at the nearest ft (foot) interval on the paper chart, corresponding to changes in the water level trace for each hour interval. Subtracting the digitized value from the known value (the actual measurement) allows for the determination of differences, which are then subtracted from each hourly trace value. After adjusting for offsets ranging from −3.962 to 13.716 mm (millimetres), the study improves the final accuracy of sea level data to approximately the 10 mm level. Notably, data from 1926 and 1931 exhibit modest offsets (<7 mm), while other years show more substantial offsets (>9–14 mm), emphasizing the importance of adjustments for accuracy. Such 10 mm accuracy is compatible with requirements of the Global Sea Level Observing System. Comparing the adjusted digitized data with other survey data shows similar amplitudes and phases for Dún Laoghaire in both the historical and modern datasets, and there is an overall mean sea level rise of 1.5 mm/year when combined with the available data from the Dublin region.

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A newly reconciled dataset for identifying sea level rise and variability in Dublin Bay

Cited by 4 publications

References 24 publications

Assessing Coastal Flood Risk in a Changing Climate for Dublin, Ireland

Assessing Coastal Flood Risk in a Changing Climate for Dublin, Ireland

Two Centuries of Relative Sea-Level Rise in Dublin, Ireland, Reconstructed by Geological Tide Gauge

The accurate digitization of historical sea level records

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