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05-Jun-2016 09:04

Die Basis des Holozäns befindet sich bei 1492,45 Bohrmetern im obersten Abschnittes des NGRIP-Kerns und ist als diejenige Eislage definiert, ab der das Eis deutlichste Signale für einen Klimaerwärmung liefert.Dieses klimatische Ereignis markiert im ausgehenden Pleistozän das Ende der Jüngeren Dryas bzw. Die Klimaerwärmung äußert sich durch folgende physiko-chemikalische Veränderungen im Grönlandeis: Diese Änderungen spiegeln einen einschneidenden Umschwung im Muster der atmosphärischen Zirkulation wider, der zu Beginn des Holozäns mit einer Temperaturerhöhung um 10 °C im Arktisbereich einherging.Therefore, high energy cosmic or solar events should simultaneously create excess Be deposition was apparently offset from trees by 6-7 years, with the ice core chronologies being too old.These events, as well as tephra markers and historical records of dust veils, were used constrain and evaluate the dating of the ice cores and has led to the creation of a new dating scheme, NEEM NS1 (see figure 1).

Dieser Vorschlag wurde 2008 von der International Union of Geological Sciences (IUGS) ratifiziert. Die NGRIP2-Bohrung erfolgte zwischen 19 im nordgrönländischen Eisschild auf 75,10° nördlicher Breite und 42,3 ° westlicher Länge.The clinching evidence was provided by linking tree-ring chronologies to ice cores through two extraterrestrial events…Be) is formed from high energy collisions with N and O in the atmosphere, and because of its long lifetime and affinity for soluble aerosols, it precipitates out of the atmosphere quickly and can be measured in ice cores.Common global stratigraphic markers are palaeo-events that occur worldwide synchronously, and can allow wiggle-matching between ice cores and other palaeo archives (e.g., marine sediment cores).

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For the ice matrix, these global stratigraphic markers can include spikes in volcanic ash (each volcanic eruption has a unique chemical signature), or volcanic sulfate spikes.

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