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Chronologie der Vereisungen der noerdlichen und der suedlichen Hemisphaere

Description: Das Projekt "Chronologie der Vereisungen der noerdlichen und der suedlichen Hemisphaere" wird vom Umweltbundesamt gefördert und von Universität Bern, Geologisches Institut durchgeführt. A new radiocarbon chronology shows that piedmont glacier lobes in the Chilean Andes achieved maxima at 14500-14700; 21000;23100; 27500; 29000; and at least once higher 35000 years before present, all within a cold and wet Subatarctic Parkland environment. Massive glacier collapse, which began shortly before 14'350 years ago and was followed by an influx of North Patagonian Rain Forest species, terminated the last glaciation. In the Southern Part of New Zealand, an additional glacial maximum is recorded at 17'500 years before present, along with a Younger Dryas age readvance at 11050 years ago. These glacier peaks in South Pacific mid-latitude mountains replicate ice-rafting pulses in the North Atlantic Ocean. Further, the last termination began suddenly and simultaneously in both polar hemispheres prior to the resumption of the modern mode of deep-water production in the Nordic Seas. Such tight interhemispheric coupling is difficult to explain by regional North Atlantic events such as Laurentide ice-sheet surges or thermohaline switches. Rather, it implies global forcing that had its source in the atmosphere.

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Origin: /Bund/UBA/UFORDAT

Tags: Klimatologie ? Anden ? Chile ? Eis ? Gletscher ? Neuseeland ? Regenwald ? Meeresgewässer ? Nordatlantik ? Südpazifik ? Atmosphäre ? Gebirge ? Globale Aspekte ? Atlantischer Ozean ? Pazifischer Ozean ? Chronologie ? Noerdliche Hemisphaere ? Suedliche Hemisphaere ? Vereisung ?

License: cc-by-nc-nd/4.0

Language: Deutsch

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Time ranges: 1995-10-01 - 2001-09-30

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