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Presence of the Solar de Vries Cycle (∼205 years) during the Last Ice Age
Department of Surface Waters, EAWAG, Dübendorf, Switzerland
Department of Surface Waters, EAWAG, Dübendorf, Switzerland
Department of Surface Waters, EAWAG, Dübendorf, Switzerland
Department of Surface Waters, EAWAG, Dübendorf, Switzerland
Paul Scherrer Institute, Zürich, Switzerland
Freie Universität Berlin, Berlin, Germany
Laboratoire des Sciences du Climat et de l’Environnement, Gif‐sur‐Yvette, France
Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Orsay, France
Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Orsay, France
Certain characteristic periodicities in the Δ14C record from tree rings, such as the well‐known 11‐yr Schwabe cycle, are known to be of solar origin. The origin of longer‐period cycles, such as the 205‐yr de Vries cycle, in the Δ14C record was less certain, and it was possible to attribute it either to solar or climatic variability. Here, we demonstrate that the de Vries cycle is present in 10Be data from the GRIP ice core during the last ice age (25 to 50 kyr BP). Analysis of the amplitude of variation of this cycle shows it to be modulated by the geomagnetic field, indicating that the de Vries cycle is indeed of solar, rather than climatic, origin.
Received 4 April 2000; accepted 28 September 2000; .
Citation: (2001), Presence of the Solar de Vries Cycle (∼205 years) during the Last Ice Age, Geophys. Res. Lett., 28(2), 303–306.
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