Tracking Holocene palaeostratification and productivity changes in the Western Irish Sea: A multi-proxy record

Woods, Mark; Wilkinson, Ian P.; Leng, Melanie J.; Riding, James B.; Vane, Christopher H.; Santos, Raquel A. Lopes dos; Kender, Sev; Schepper, Stijn De; Hennissen, Jan A.I.; Ward, Sophie; Gowing, Charles; Wilby, Philip R.; Nichols, Matthew; Rochelle, Christopher A.

doi:10.1016/j.palaeo.2019.06.004

Cited by 13 publications

(5 citation statements)

References 70 publications

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“…Attempts have also been made to reconstruct tidal dynamics by linking sea bed sediment types from sediments cores to bed shear stress in order to infer tidal current strength (Ward et al, ) but were hampered by limitations of the sedimentary records. Studies reconstructing changes in stratification in paleo–shelf seas from plankton assemblages (e.g., Scourse et al, ; Woods et al, ) can provide an indication of the strength of tidal currents by tracking tidal mixing fronts but again only provide an indication of regional tidal conditions. In the late twentieth century, a number of studies highlighted the possibility of using tidally driven microgrowth patterns in bivalve shells to reconstruct paleo–tidal dynamics (e.g., Pannella, )—this method has been used to infer Late Pleistocene tides in Osaka Bay (Japan) (Ohno, ; Tojo et al, ) but has not been widely applied since.…”

Section: Past Changes In Tidesmentioning

confidence: 99%

The Tides They Are A‐Changin': A Comprehensive Review of Past and Future Nonastronomical Changes in Tides, Their Driving Mechanisms, and Future Implications

Haigh

Pickering

Green

et al. 2020

Reviews of Geophysics

176

173

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Scientists and engineers have observed for some time that tidal amplitudes at many locations are shifting considerably due to nonastronomical factors. Here we review comprehensively these important changes in tidal properties, many of which remain poorly understood. Over long geological time scales, tectonic processes drive variations in basin size, depth, and shape and hence the resonant properties of ocean basins. On shorter geological time scales, changes in oceanic tidal properties are dominated by variations in water depth. A growing number of studies have identified widespread, sometimes regionally coherent, positive, and negative trends in tidal constituents and levels during the 19th, 20th, and early 21st centuries. Determining the causes is challenging because a tide measured at a coastal gauge integrates the effects of local, regional, and oceanic changes. Here, we highlight six main factors that can cause changes in measured tidal statistics on local scales and a further eight possible regional/global driving mechanisms. Since only a few studies have combined observations and models, or modeled at a temporal/spatial resolution capable of resolving both ultralocal and large‐scale global changes, the individual contributions from local and regional mechanisms remain uncertain. Nonetheless, modeling studies project that sea level rise and climate change will continue to alter tides over the next several centuries, with regionally coherent modes of change caused by alterations to coastal morphology and ice sheet extent. Hence, a better understanding of the causes and consequences of tidal variations is needed to help assess the implications for coastal defense, risk assessment, and ecological change.

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Section: Past Changes In Tidesmentioning

confidence: 99%

The Tides They Are A‐Changin': A Comprehensive Review of Past and Future Nonastronomical Changes in Tides, Their Driving Mechanisms, and Future Implications

Haigh

Pickering

Green

et al. 2020

Reviews of Geophysics

176

173

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“…The sediment waves vary in size and morphology, with the magnitude of migration highest in the central Irish Sea, with average rates of up to 35 m/year, decreasing northward (Van Landeghem, Uehara et al, 2009; Van Landeghem et al, 2012; Coughlan et al, 2020). The northward transport of sediment eventually terminates in an area of low bed stress, referred to as the Western Irish Sea Mud Belt, where the fine‐grained sediment has been accumulating since the end of the last glaciation (Belderson, 1964; Woods et al, 2019). In this area, there are thick deposits (up to 40 m) of stratified gray‐brown muddy sands with silts and clays referred to as the mud facies (Jackson et al, 1995).…”

Section: Methodsmentioning

confidence: 99%

Spatial and temporal variability in geomorphic change at tidally influenced shipwreck sites: The use of time‐lapse multibeam data for the assessment of site formation processes

et al. 2021

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Shipwrecks are an integral part of our maritime archaeological landscape and are associated with diverse societal and cultural interests, yielding significant management challenges. Coupled hydrodynamic and geomorphological processes significantly impact the effective in situ preservation of these fragile sites. In this study, we assess sediment budget change and hydrodynamic triggers at metal‐hulled shipwrecks lost between 1875 and 1918, all located in the tidally dominated Irish Sea at depths between 26 and 84 m. This is conducted using time‐lapse, multibeam echosounder surveys at multiannual, annual, and weekly time steps, supported by sediment grain‐size analysis, modeled ocean currents, and shallow seismic data. Results indicate significant changes at all time steps for sites located in sand‐dominated environments, whereas the seabed around shipwrecks settled in multimodal sediments shows virtually no change outside of measurement errors (±30 cm). Variability in geomorphic change is attributed to local environmental factors, including bed shear stress, sediment supply, and spatial barriers to scour. We demonstrate that individual wrecks in similar shelf sea regions can be in very different equilibrium states, which has critical implications for the in situ management of underwater cultural heritage.

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“…and Quinqueloculina spp. have been attributed to a combination of vital effects and seasonal differences in the timing of shell calcification [86][87][88][89]. Scourse et al (2004) [86] showed that Ammonia batavus calcifies during the same period as Quinqueloculina seminulum (September) when stratified conditions occur in a continental shelf environment.…”

Section: Stable Isotopesmentioning

confidence: 99%

Holocene Paleoenvironmental Evolution of a Semi-Enclosed Shallow Aegean Basin: A Combination of Seismic Stratigraphy and Sediment Core Proxies

Noti

Lourens

Geraga

et al. 2022

Water

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The island of Astypalea (Greece), known for its rich and pristine archeological sites, encompasses a semi-enclosed silled basin that has been very susceptible to global sea levels and regional climate changes due to its relatively modern shallow sill of 4.7 m water deep that connects the Vathy bay with the adjacent Aegean Sea. To identify the causal relationship between regional climate, sea-level trajectories, and environmental change and their potential impact on hominine habitats on the island, we investigated a high-resolution seismic profile together with sediment, stable isotope, geochemical, and biotic proxies retrieved from a marine sediment core (ASTC1). Our results show that the basin was once isolated, and a marine inundation occurred at around 7.3 ka BP, which is older than expected, based on global sea level reconstructions. The entire transition from isolation to full marine conditions was accomplished in three major phases: (1) non-marine isolated conditions between 9–7.3 ka BP, (2) semi-isolated hypersaline marsh and lagoonal conditions between 7.3 and 4.1 ka BP, and (3) semi-isolated shallow marine conditions of today (4.1 ka BP to present). High water alkalinity, elevated organic content, and heavier isotopic signals indicate relatively arid conditions in the region that favored Sr-rich carbonate precipitation within the 7.3–6 ka BP interval. On the other hand, freshwater biota, along with a high Corg/N ratio and lighter isotopic signal, showed wetter conditions, at least for the intervals 8–7.3 ka and 6–5.4 ka BP, in contrast to the aridification trend seen as 4.1 ka to present. Finally, the hominine habitat evolution at around 6 ka BP might be attributed to the wetter conditions and the freshwater source provided by the bay at that time.

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Tracking Holocene palaeostratification and productivity changes in the Western Irish Sea: A multi-proxy record

Cited by 13 publications

References 70 publications

The Tides They Are A‐Changin': A Comprehensive Review of Past and Future Nonastronomical Changes in Tides, Their Driving Mechanisms, and Future Implications

The Tides They Are A‐Changin': A Comprehensive Review of Past and Future Nonastronomical Changes in Tides, Their Driving Mechanisms, and Future Implications

Spatial and temporal variability in geomorphic change at tidally influenced shipwreck sites: The use of time‐lapse multibeam data for the assessment of site formation processes

Holocene Paleoenvironmental Evolution of a Semi-Enclosed Shallow Aegean Basin: A Combination of Seismic Stratigraphy and Sediment Core Proxies

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