Climatically induced cyclicity recorded in the morphology of uplifting Tihu coastal ridgeplain, Hiiumaa Island, eastern Baltic Sea

Suursaar, Ülo; Rosentau, Alar; Hang, Tiit; Tõnisson, Hannes; Tamura, Takeshi; Vaasma, Tiit; Vandel, Egert; Vilumaa, Kadri; Sugita, S.

doi:10.1016/j.geomorph.2022.108187

Cited by 4 publications

(2 citation statements)

References 76 publications

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“…Instead, some quasi cyclic, decadalscale variations appear that may accom modate some shorter linear cuts between shifts and backshifts (e.g., Keevallik and Soomere 2014) and leave some room for different interpretations. It is quite possible that the same, roughly 25-35year quasicyclicity in wind conditions is also reflected in elevated beach ridge systems found in the West Estonian Archipelago (Suursaar et al 2022). At Kunda, one can see how the (seemingly small) sea ward shift in the location of the station had a vast impact on the time series (Fig.…”

Section: Long-term Variations In 1966-2021mentioning

confidence: 84%

Variations in wind velocity components and average air flow properties at Estonian coastal stations in 1966–2021; Sõrve Peninsula case study

Suursaar

2023

EJES

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Despite considerable differences in local conditions, the average air flow parameters at coastal stations had similar seasonal and interannual patterns. The decreasing trends in average wind speeds were not reliable due to inhomogeneity in the long-term series. Being less sensitive to inhomogeneities, both the zonal and meridional components and the average air flow estimates increased in 1966-2021. The changes in flow direction and in other wind characteristics were better described as quasi-cyclic rather than using a linear trend. In the Sõrve coastal case study, the wind velocity components were separated into opposite subsets, which were one-sidedly analysed by ignoring the other direction. Both westerly and easterly sub-components increased by 0.5 m/s in 2004-2021. Regarding wind-driven coastal processes along the peninsula, the changes in the westerly component, but not in the easterly component, are important on the western coast, and vice versa for the eastern coast. Assuming the potential impacts of winds via waves and currents, the influence of long-term changes in sea ice conditions were considered. Although the forcing load was more than twice as high on the western coast, the relative effect of the 'ice mask' was smaller, as ice conditions were milder there. Along the eastern coast of the Sõrve Peninsula, the prevalence of SW-directed forcing can be expected, because the westerly forcing is shaded there by land. The SW-directed flow has strengthened over the study period because of an increase in the easterly and northerly wind speed subset and a decrease in the ice cover on the Gulf of Riga.

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Section: Long-term Variations In 1966-2021mentioning

confidence: 84%

Variations in wind velocity components and average air flow properties at Estonian coastal stations in 1966–2021; Sõrve Peninsula case study

Suursaar

2023

EJES

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“…The coastline of Estonia, especially along its northern margin, represents ideal field sites for such a study due to the combination of: 1) the functionally non-tidal basin; 2) the recent isostatic uplift, and 3) the abundant sediment supply resulting in prograded strandplains of various orientations (Orviku et al 2003;Kont et al 2007;Tõnisson et al 2011;Rosentau et al 2013;Muru et al 2018;Tõnisson et al 2018;Suursaar et al 2019Suursaar et al , 2022Rosentau et al 2020;Soomere et al 2020). The latter contain a rich archive of erosional signatures due to the net accretionary mode facilitated by uplift, which is often termed "forced regression".…”

Section: Introductionmentioning

confidence: 99%

Diverse erosional indicators along a rapidly retreating Holocene strandplain margin, leeward Hiiumaa Island, Estonia

Buynevich¹,

Tõnisson²,

Suursaar³

et al. 2023

Baltica

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A diverse suite of erosional features along the shoreline of Lehtma (Hiiumaa Island, Estonia) is used to assess their morphodynamic context and preservation potential. The Holocene strandplain along the east-facing (leeward) shoreline has experienced rapid retreat due to the anthropogenically induced sediment deficit. The study site is located just updrift of the erosional-depositional fulcrum segment, with southerly longshore transport resulting in the accumulation of eroded sand along a drift-aligned spit. The most prominent erosional indicators are mature pine trees in different stages of undercutting, toppling, fragmentation, and burial. Morphological features include scarps in paleo-beach/dune ridges (height: > 1 m), as well as modern berm scarps. Mineralogical indicators are exemplified by heavy-mineral concentrations (HMCs) of variable thickness (some > 2 cm) and concentration. Representative samples show a substantial increase in bulk low-field magnetic susceptibility ranging from < 10 µSI common to the nearby Holocene coastal lithosomes to > 8,000 µSI in second-cycle HMCs within berm enrichment zones. A conceptual morphosedimentary model describing the recent and current state of the system, as well as the preservation potential of specific structures and recognition in geological research (e.g., georadar signatures of buried trees and HMCs) is proposed. The approach presented in this study can be used to assess the distribution and preservation potential of erosional indicators along the Baltic Sea coast and mineralogically heterogeneous, forested sandy shorelines worldwide.

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Overview and evolutionary path of Estonian coastal lagoons

Suursaar,

Torn,

Mäemets

et al. 2024

Estuarine, Coastal and Shelf Science

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Climatically induced cyclicity recorded in the morphology of uplifting Tihu coastal ridgeplain, Hiiumaa Island, eastern Baltic Sea

Cited by 4 publications

References 76 publications

Variations in wind velocity components and average air flow properties at Estonian coastal stations in 1966–2021; Sõrve Peninsula case study

Variations in wind velocity components and average air flow properties at Estonian coastal stations in 1966–2021; Sõrve Peninsula case study

Diverse erosional indicators along a rapidly retreating Holocene strandplain margin, leeward Hiiumaa Island, Estonia

Overview and evolutionary path of Estonian coastal lagoons

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