Relative sea-level curve for SE Rügen and Usedom Island (SW Baltic Sea coast, Germany) using decompacted profiles

Author(s):  
Gösta Hoffmann ◽  
Nico Schmedemann ◽  
Maria-Theresia Schafmeister
2011 ◽  
Vol 59 (1/2) ◽  
pp. 3-20 ◽  
Author(s):  
Reinhard Lampe ◽  
Elisabeth Endtmann ◽  
Wolfgang Janke ◽  
Hinrich Meyer

Abstract. Jüngere Pegeldaten aus dem nordostdeutschen Ostsee-Küstenraum legen nahe, dass die eustatische Komponente der gegenwärtigen Meeresspiegeländerung überlagert wird durch eine räumlich differenzierte nicht-eustatische, insbesondere glazial- isostatisch, Komponente. Um zu untersuchen, in welchem Maße die frühere Meeresspiegelentwicklung durch diese beiden Komponenten beeinflusst wurde, wurde versucht, diese so weit zurück zu verfolgen, wie dies die Mächtigkeit der marinen Küstensedimentfolgen erlaubte. Drei neue relative Meeresspiegelkurven wurden abgeleitet, wovon zwei hier zum ersten Mal präsentiert werden. Die Kurven basieren auf zahlreichen AMS-Radiokohlenstoff-Datierungen von Meeresspiegel-Indexpunkten wie Basistorfen, archäologischen Unterwasserfunden und Torfprofilen aus Küstenüberflutungsmooren. Obwohl der Indikationswert der Proben aus den Küstenmooren wegen deren möglicher Kompaktion fraglich ist, konnten zuverlässige Angaben durch den Abgleich von Daten aus unterschiedlichen Ablagerungsräumen gewonnen werden. Die drei abgeleiteten Meeresspiegelkurven überdecken den Zeitraum von 6000 bis 7000 v. Chr. bis zur Gegenwart und divergieren gleichmäßig mit zunehmendem Alter. Ein Uferlinienverschiebungsdiagramm zeigt, dass tektonische Ereignisse dieses räumliche Bewegungsmuster nicht signifikant beeinflusst haben. Für die Bestimmung der isostatischen Komponente wurden die Meeresspiegelkurven verglichen mit einer von Denys/Baeteman (1995) publizierten Kurve für die belgische Küste, die als tektonisch und isostatisch stabiler gilt. Der Verlauf dieser Kurve wird daher hauptsächlich von der eustatischen Komponente bestimmt. Der Vergleich legt nahe, dass der SW-Abschnitt der deutschen Ostseeküste gegenwärtig eine leichte Submergenz aufweist, möglicherweise infolge eines sich rückbildenden, glazial bedingten Randwulstes. Im zentralen Abschnitt ist die isostatische Bewegung vor wenigen Tausend Jahren ausgeklungen, im nördlichen Abschnitt hält sie dagegen immer noch an. Hier beträgt die maximale Hebung während der letzten 9000 Jahre etwa 6 m relativ zur belgischen Küste.


2021 ◽  
Vol 266 ◽  
pp. 107071
Author(s):  
Alar Rosentau ◽  
Volker Klemann ◽  
Ole Bennike ◽  
Holger Steffen ◽  
Jasmin Wehr ◽  
...  

Solid Earth ◽  
2014 ◽  
Vol 5 (1) ◽  
pp. 447-459 ◽  
Author(s):  
H. Steffen ◽  
G. Kaufmann ◽  
R. Lampe

Abstract. During the last glacial maximum, a large ice sheet covered Scandinavia, which depressed the earth's surface by several 100 m. In northern central Europe, mass redistribution in the upper mantle led to the development of a peripheral bulge. It has been subsiding since the begin of deglaciation due to the viscoelastic behaviour of the mantle. We analyse relative sea-level (RSL) data of southern Sweden, Denmark, Germany, Poland and Lithuania to determine the lithospheric thickness and radial mantle viscosity structure for distinct regional RSL subsets. We load a 1-D Maxwell-viscoelastic earth model with a global ice-load history model of the last glaciation. We test two commonly used ice histories, RSES from the Australian National University and ICE-5G from the University of Toronto. Our results indicate that the lithospheric thickness varies, depending on the ice model used, between 60 and 160 km. The lowest values are found in the Oslo Graben area and the western German Baltic Sea coast. In between, thickness increases by at least 30 km tracing the Ringkøbing-Fyn High. In Poland and Lithuania, lithospheric thickness reaches up to 160 km. However, the latter values are not well constrained as the confidence regions are large. Upper-mantle viscosity is found to bracket [2–7] × 1020 Pa s when using ICE-5G. Employing RSES much higher values of 2 × 1021 Pa s are obtained for the southern Baltic Sea. Further investigations should evaluate whether this ice-model version and/or the RSL data need revision. We confirm that the lower-mantle viscosity in Fennoscandia can only be poorly resolved. The lithospheric structure inferred from RSES partly supports structural features of regional and global lithosphere models based on thermal or seismological data. While there is agreement in eastern Europe and southwest Sweden, the structure in an area from south of Norway to northern Germany shows large discrepancies for two of the tested lithosphere models. The lithospheric thickness as determined with ICE-5G does not agree with the lithosphere models. Hence, more investigations have to be undertaken to sufficiently determine structures such as the Ringkøbing-Fyn High as seen with seismics with the help of glacial isostatic adjustment modelling.


2018 ◽  
Author(s):  
David Patrick Gold ◽  
James P. G. Fenton ◽  
Manuel Casas-Gallego ◽  
Vibor Novak ◽  
Irene Pérez-Rodríguez ◽  
...  

The island of Jamaica forms the northern extent of the Nicaraguan Rise, an elongate linear tectonic feature stretching as far as Honduras and Nicaragua to the south. Uplift and subaerial exposure of Jamaica during the Neogene has made the island rare within the Caribbean region, as it is the only area where rocks of the Nicaraguan Rise are exposed on land. Biostratigraphic dating and palaeoenvironmental interpretations using larger benthic foraminifera, supplemented by planktonic foraminifera, nannopalaeontology and palynology of outcrop, well and corehole samples has enabled the creation of a regional relative sea-level curve through identification of several depositional sequences. This study recognises ten unconformity-bounded transgressive-regressive sequences which record a complete cycle of relative sea level rise and fall. Sequences are recognised in the Early to ‘Middle’ Cretaceous (EKTR1), Coniacian-Santonian (STR1), Campanian (CTR1), Maastrichtian (MTR1-2), Paleocene-Early Eocene (PETR1), Eocene (YTR1-3) and Late Eocene-Oligocene (WTR1). These transgressive-regressive cycles represent second to fourth order sequences, although most tie with globally recognised third order sequences. Comparisons of the Jamaican relative sea-level curve with other published global mean sea-level curves show that local tectonics exerts a strong control on the deposition of sedimentary sequences in Jamaica. Large unconformities (duration >1 Ma) are related to significant regional tectonic events, with minor overprint of a global eustatic signal, while smaller unconformities (duration <1 Ma) are produced by global eustatic trends. The relatively low rates of relative sea-level rise calculated from the regional relative sea-level curve indicate that carbonate production rates were able to keep pace with the rate of relative sea-level rise accounting for the thick successions of Maastrichtian carbonates and those of the Yellow and White Limestone Groups. Carbonate platform drowning within the White Limestone Group during the Oligocene to Miocene is attributed to environmental deterioration given the low rates of relative sea-level rise.


2019 ◽  
Vol 124 (3) ◽  
pp. 2054-2071 ◽  
Author(s):  
Leigh R. MacPherson ◽  
Arne Arns ◽  
Sönke Dangendorf ◽  
Athanasios T. Vafeidis ◽  
Jürgen Jensen
Keyword(s):  

2020 ◽  
Author(s):  
Jani Särkkä ◽  
Jani Räihä ◽  
Matti Kämäräinen ◽  
Kirsti Jylhä

<p>Coastal areas are under rapid changes. Management to face flooding hazards in changing climate is of great significance due to the major impact of flooding events in densely populated coastal regions, where also important and vulnerable infrastructure is located. The sea level of the Baltic Sea is affected by internal fluctuations caused by wind, air pressure and seiche oscillations, and by variations of the water volume due to the water exchange between the Baltic Sea and the North Sea through the Danish Straits. The highest sea level extremes are caused by cyclones moving over the region. The most vulnerable locations are at the ends of the bays. St. Petersburg, located at the eastern end of the Gulf of Finland, has experienced major sea floods in 1777, 1824 and 1924.</p><p>In order to study the effects of the depths and tracks of cyclones on the extreme sea levels, we have developed a method to generate cyclones for numerical sea level studies. A cyclone is modelled as a two-dimensional Gaussian function with adjustable horizontal size and depth. The cyclone moves through the Baltic Sea region with given direction and velocity. The output of this method is the gridded data set of mean sea level pressure and wind components which are used as an input for the sea level model. The internal variations of the Baltic Sea are calculated with a numerical barotropic sea level model, and the water volume variations are evaluated using a statistical sea level model based on wind speeds near the Danish Straits. The sea level model simulations allow us to study extremely rare but physically plausible sea level events that have not occurred during the observation period at the Baltic Sea coast. The simulation results are used to investigate extreme sea levels that could occur at selected sites at the Finnish coastline.</p>


2014 ◽  
Vol 82 (1) ◽  
pp. 185-197 ◽  
Author(s):  
Karen M. Simon ◽  
Thomas S. James ◽  
Donald L. Forbes ◽  
Alice M. Telka ◽  
Arthur S. Dyke ◽  
...  

AbstractThirty-six new and previously published radiocarbon dates constrain the relative sea-level history of Arviat on the west coast of Hudson Bay. As a result of glacial isostatic adjustment (GIA) following deglaciation, sea level fell rapidly from a high-stand of nearly 170 m elevation just after 8000 cal yr BP to 60 m elevation by the mid Holocene (~ 5200 cal yr BP). The rate of sea-level fall decreased in the mid and late Holocene, with sea level falling 30 m since 3000 cal yr BP. Several late Holocene sea-level measurements are interpreted to originate from the upper end of the tidal range and place tight constraints on sea level. A preliminary measurement of present-day vertical land motion obtained by repeat Global Positioning System (GPS) occupations indicates ongoing crustal uplift at Arviat of 9.3 ± 1.5 mm/yr, in close agreement with the crustal uplift rate inferred from the inferred sea-level curve. Predictions of numerical GIA models indicate that the new sea-level curve is best fit by a Laurentide Ice Sheet reconstruction with a last glacial maximum peak thickness of ~ 3.4 km. This is a 30–35% thickness reduction of the ICE-5G ice-sheet history west of Hudson Bay.


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