Sea-Level Change in the Baltic Sea: Interrelation of Climatic and Geological Processes
Jan Harff, Alexander Frischbutter, Reinhard Lampe, Michael Meyer, 2001. "Sea-Level Change in the Baltic Sea: Interrelation of Climatic and Geological Processes", Geological Perspectives of Global Climate Change, Lee C. Gerhard, William E. Harrison, Bernold M. Hanson
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The development of the Baltic Sea during the Holocene was mainly controlled by climatically driven eustatic sea-level change and vertical crustal movements. Both factors affect sea-level changes interpreted from sedimentological investigations at coastal locations. Comparison of relative sea-level curves with a eustatic curve reveals the contribution of vertical crustal movements to coastal changes as expressed via a “coast index.” A coast index c(i) for the Baltic region can be derived, by which a location can be allocated to either a “crustal-uplift/subsidence type” or a “climate-controlled type.” Coastal locations investigated along the Fennoscandian Shield belong to the crustal-uplift type and locations along the southern and southwestern coast belong to the climate-controlled type, regardless of whether they are on the East European Platform or the West European Platform. Data on recent vertical crustal movements show a broad, predominantly subsiding zone between the rising blocks of Scandinavia (glacio-isostatic uplift) and the Carpathians (northward drift of the African Plate) to the west of the Tornquist-Teisseyre Zone (TTZ). Movements may additionally be influenced by processes initiated along the North Atlantic Mid-Ocean Ridge. The subsiding belt contiguous to the Fennoscandian Shield is interpreted as a collapsing as- thenospheric bulge originally surrounding the Pleistocene ice shield. The analysis of relative sea-level changes leads to the assumption that the process of collapse reached a steady state during the Late Litorina Stage. Crustal movement data, together with data from modeling of future sea-level change, can be used for calculating scenarios of relative sea-level development, providing a background for long-term planning of human activities in coastal areas.
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Geological Perspectives of Global Climate Change
Access A Broad Range of Paleoclimatic Studies. Current debates regarding potential man-induced modification of climate make this volume especially timely. Introductory sections address the major and minor physical controls, or drivers, that affect Earth's climate. Several chapters describe the naturally occurring range of variation of climatic conditions and illustrate past changes in global temperatures. Case studies show how ancient temperature conditions are determined, as well as new techniques that have significant potential as proxies for assessing paleoclimates. Several chapters demonstrate the magnitude and length of duration of numerous temperature variations, which occurred during geologic time periods.