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Presence of the Solar de Vries Cycle (∼205 years) during the Last Ice Age
Author(s) -
Wagner Gerhard,
Beer Jürg,
Masarik Jozef,
Muscheler Raimund,
Kubik Peter W.,
Mende Werner,
Laj Carlo,
Raisbeck Grant M.,
Yiou Francoise
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl006116
Subject(s) - solar cycle , climatology , ice core , ice age , geology , period (music) , earth's magnetic field , atmospheric sciences , physics , solar wind , glacial period , paleontology , magnetic field , acoustics , quantum mechanics
Certain characteristic periodicities in the Δ 14 C 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 Δ 14 C 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 10 Be 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.